Question 1

Lithium and nitrogen react to produce lithium nitride: 6 Li(s)+ (g)→ 2 Li₃N(s) How many moles of are needed to react with 0.550 mol of lithium?

Accepted Answer

The answer of Lithium and nitrogen react to produce lithium...

Question 2

How many grams of water react to form 6.21 moles of Ca(OH)₂? CaO(s)+ H₂O(l)→ Ca(OH)₂(s)

Accepted Answer

The answer of How many grams of water react to...

Question 3

Automotive air bags inflate when sodium azide decomposes explosively to its constituent elements: 2 NaN₃(s)→ 2 Na(s)+ 3 N₂(g) How many moles of N₂ are produced by the decomposition of 1.75 mol of sodium azide?

Accepted Answer

From the balanced chemical equation, we can see that there is a 3:2 mole ratio between N₂ and NaN₃. This means that for every 2 moles of NaN₃ decomposed, 3 moles of N₂ are produced. To find the number of moles of N₂ produced from 1.75 moles of NaN₃, we can use a proportion: 2 mol NaN₃/3 mol N₂ = 1.75 mol NaN₃/x Solving for x, we get: x = (3 mol N₂ * 1.75 mol NaN₃) / 2 mol NaN₃ = 2.63 mol N₂ Therefore, the answer is choice C, 2.63.

Question 4

How many molecules of HCl are formed when 70.0 g of water reacts according to the following balanced reaction? Assume excess ICl₃. 2 ICl₃ + 3 H₂O → ICl + HIO₃ + 5 HCl

Accepted Answer

The molar mass of water (H₂O) is 18.02 g/mol. Therefore, 70.0 g of water is 70.0 g / 18.02 g/mol = 3.88 mol of H₂O. According to the balanced equation, 3 moles of H₂O produce 5 moles of HCl. Thus, 3.88 mol of H₂O will produce (3.88 mol H₂O) * (5 mol HCl / 3 mol H₂O) = 6.47 mol of HCl. The number of molecules is then 6.47 mol * 6.022 × 10²³ molecules/mol = 3.90 × 10²⁴ molecules of HCl.

Question 5

According to the following balanced reaction,how many moles of Ca(OH)₂ will be formed from 3.22 moles of H₂O? CaO(s)+ H₂O(l)→ Ca(OH)₂(s)

Accepted Answer

The balanced chemical equation shows a 1:1 mole ratio between H₂O and Ca(OH)₂, so 3.22 moles of H₂O will produce 3.22 moles of Ca(OH)₂.

Question 6

How many grams of calcium chloride are needed to produce 5.00 g of potassium chloride? CaCl₂(aq)+ K₂CO₃(aq)→ 2 KCl(aq)+ CaCO₃(aq)

Accepted Answer

First, we need to balance the chemical equation, but it seems there's a typo in the given equation. Assuming the intended reaction is between calcium chloride (CaCl2) and potassium carbonate (K2CO3) to produce potassium chloride (KCl) and calcium carbonate (CaCO3), the balanced equation would be:$$ \text{CaCl}_2(aq) + \text{K}_2\text{CO}_3(aq) \rightarrow 2\text{KCl}(aq) + \text{CaCO}_3(s) $$To find out how many grams of calcium chloride are needed to produce 5.00 g of potassium chloride, we use the molar masses of the compounds involved and stoichiometry from the balanced equation.1. Calculate moles of KCl produced:$$ \text{Molar mass of KCl} = 74.55 \, \text{g/mol} $$$$ \text{Moles of KCl} = \frac{5.00 \, \text{g}}{74.55 \, \text{g/mol}} \approx 0.0671 \, \text{mol} $$2. Use the stoichiometry of the reaction:$$ 2 \, \text{mol KCl} \, \text{is produced from} \, 1 \, \text{mol CaCl}_2 $$$$ \text{Moles of CaCl}_2 = \frac{0.0671 \, \text{mol KCl}}{2} = 0.03355 \, \text{mol} $$3. Calculate mass of CaCl2 needed:$$ \text{Molar mass of CaCl}_2 = 110.98 \, \text{g/mol} $$$$ \text{Mass of CaCl}_2 = 0.03355 \, \text{mol} \times 110.98 \, \text{g/mol} \approx 3.72 \, \text{g} $$Therefore, 3.72 g of calcium chloride are needed to produce 5.00 g of potassium chloride.

Question 7

Balance the chemical equation given below,and determine the number of moles of iodine that react with 40.0 g of aluminum. _____ Al(s)+ _____ I₂(s)→ _____ Al₂I₆(s)

Accepted Answer

The balanced equation is 2 Al + 3 I2 → Al2I6. The molar mass of Al is 26.98 g/mol, so 40.0 g of Al is 40.0 g / 26.98 g/mol = 1.48 mol Al. According to the balanced equation, 2 moles of Al react with 3 moles of I2, so 1.48 mol Al will react with (3/2) * 1.48 mol = 2.22 mol of I2.

Question 8

Magnesium burns in air with a dazzling brilliance to produce magnesium oxide: 2 Mg(s)+ O₂(g)→ 2 MgO(s) How many moles of O₂ are consumed when 2.10 mol of magnesium burns?

Accepted Answer

From the balanced equation, we can see that the mole ratio between magnesium and oxygen is 2:1. This means that for every 2 moles of magnesium consumed, 1 mole of oxygen is consumed. Therefore, if 2.10 mol of magnesium burns, it would consume 1.05 mol of O₂. The best choice based on this calculation is E, which gives the answer of 1.05.

Question 9

Automotive air bags inflate when sodium azide decomposes explosively to its constituent elements: 2 NaN₃(s)→ 2 Na(s)+ 3 N₂(g) How many grams of sodium azide are required to produce 25.0 g of nitrogen?

Accepted Answer

To find the grams of sodium azide required, first calculate the moles of nitrogen produced: 25.0 g N₂ × (1 mol N₂/28.02 g N₂) = 0.892 mol N₂. From the balanced equation, 3 moles of N₂ are produced from 2 moles of NaN₃. Therefore, 0.892 mol N₂ × (2 mol NaN₃/3 mol N₂) = 0.595 mol NaN₃. Finally, convert moles of NaN₃ to grams: 0.595 mol NaN₃ × (65.01 g NaN₃/1 mol NaN₃) = 38.7 g NaN₃.

Question 10

Identify the species oxidized. 2 Al³⁺(aq)+ 2 Fe(s)→ 2 Al(s)+ 3 Fe²⁺(aq)

Accepted Answer

Iron (Fe) is oxidized as it loses electrons to form Fe²⁺.

Question 11

Lithium and nitrogen react to produce lithium nitride: 6 Li(s)+ (g)→ 2 Li₃N(s) How many moles of lithium nitride are produced when 0.750 mol of lithium react in this fashion?

Accepted Answer

The answer of Lithium and nitrogen react to produce lithium...

Question 12

According to the following balanced reaction,how many moles of HNO₃ are formed from 2.50 moles of NO₂if there is plenty of water present? 3 NO₂(g)+ H₂O(l)→ 2 HNO₃(aq)+ NO(g)

Accepted Answer

According to the balanced chemical equation, 3 moles of $NO_2$ produce 2 moles of $HNO_3$. Therefore, 2.50 moles of $NO_2$ would produce $(2.50 \, \text{moles} \times 2 \, \text{moles} \, HNO_3) / 3 \, \text{moles} \, NO_2 = 1.67 \, \text{moles} \, HNO_3$.

Question 13

Lithium and nitrogen react in a combination reaction to produce lithium nitride: 6 Li(s)+ (g)→ 2 Li₃N(s) How many moles of lithium are needed to produce 0.31 mol of N when the reaction is carried out in the presence of excess nitrogen?

Accepted Answer

The answer of Lithium and nitrogen react in a combination...

Question 14

How many moles of CuO can be produced from 0.450 mol of Cu₂O in the following reaction? 2 Cu₂O(s)+ O₂(g)→ 4 CuO(s)

Accepted Answer

According to the balanced chemical equation, 2 moles of Cu₂O produces 4 moles of CuO. Therefore, 0.450 mol of Cu₂O will produce (4/2) x 0.450 = 0.900 mol of CuO. Therefore, the answer is choice C.

Question 15

According to the following balanced reaction,how many moles of NO are formed from 12.66 moles of NO₂if there is plenty of water present? 3 NO₂(g)+ H₂O(l)→ 2 HNO₃(aq)+ NO(g)

Accepted Answer

The answer of According to the following balanced reaction,how many...

Question 16

Carbonic acid can form water and carbon dioxide upon heating.How much carbon dioxide is formed from 1.55 g of carbonic acid? H₂CO₃ → H₂O + CO₂

Accepted Answer

The decomposition of carbonic acid (H2CO3) into water (H2O) and carbon dioxide (CO2) can be represented by the balanced chemical equation: H2CO3 → H2O + CO2. To find how much CO2 is formed from 1.55 g of H2CO3, we first calculate the molar mass of H2CO3 (2*1.01 + 12.01 + 3*16.00 = 62.03 g/mol) and CO2 (12.01 + 2*16.00 = 44.01 g/mol). Using the stoichiometry of the reaction, 1 mole of H2CO3 produces 1 mole of CO2. Therefore, (1.55 g H2CO3 / 62.03 g/mol H2CO3) * 44.01 g/mol CO2 = 1.10 g CO2.

Question 17

Global warming is thought to be caused by the increase of one particular gas.Name the gas.

Accepted Answer

Carbon dioxide is a greenhouse gas and is known to trap heat in the atmosphere, leading to global warming. Increased levels of carbon dioxide in the atmosphere are caused by human activity such as burning fossil fuels and deforestation.

Question 18

According to the following balanced reaction,how many moles of CaO are required to exactly react with 3.22 moles of H₂O? CaO(s)+ H₂O(l)→ Ca(OH)₂(s)

Accepted Answer

The balanced chemical equation shows a 1:1 molar ratio between CaO and H₂O, so 3.22 moles of H₂O would require 3.22 moles of CaO.

Question 19

Consider the following reaction.How many moles of oxygen are required to produce 4.00 moles of water? Assume that there is excess C₃H₇SH present. C₃H₇SH(l)+ 6 O₂(g)→ 3 CO₂(g)+ SO₂(g)+ 4 H₂O(g)

Accepted Answer

According to the balanced equation, it takes 6 moles of oxygen to produce 4 moles of water. Therefore, to produce 4.00 moles of water, we need (4/3) x 6 = 8 moles of oxygen. However, since the question assumes that there is excess oxygen present, we can safely say that we need 6.00 moles of oxygen to produce 4.00 moles of water.

Question 20

How many moles of BCl₃ are needed to produce 25.0 g of HCl(aq)in the following reaction? BCl₃(g)+ 3 H₂O(l)→ 3 HCl(aq)+ B(OH)₃(aq)

Accepted Answer

First, determine the molar mass of HCl, which is approximately 1 (H) + 35.5 (Cl) = 36.5 g/mol. For 25.0 g of HCl, the number of moles is 25.0 g / 36.5 g/mol = 0.685 moles. Since the reaction shows that 1 mole of BCl3 produces 3 moles of HCl, the moles of BCl3 needed are 0.685 moles HCl / 3 = 0.229 moles.

Quiz 4: Chemical Quantities and Aqueous Reactions

Lithium and nitrogen react to produce lithium nitride: 6 Li(s) + (g) → 2 Li₃N(s) How many moles of are needed to react with 0.550 mol of lithium?

How many grams of water react to form 6.21 moles of Ca(OH) ₂? CaO(s) + H₂O(l) → Ca(OH) ₂(s)

Automotive air bags inflate when sodium azide decomposes explosively to its constituent elements: 2 NaN₃(s) → 2 Na(s) + 3 N₂(g) How many moles of N₂ are produced by the decomposition of 1.75 mol of sodium azide?

How many molecules of HCl are formed when 70.0 g of water reacts according to the following balanced reaction? Assume excess ICl₃. 2 ICl₃ + 3 H₂O → ICl + HIO₃ + 5 HCl

According to the following balanced reaction,how many moles of Ca(OH) ₂ will be formed from 3.22 moles of H₂O? CaO(s) + H₂O(l) → Ca(OH) ₂(s)

How many grams of calcium chloride are needed to produce 5.00 g of potassium chloride? CaCl₂(aq) + K₂CO₃(aq) → 2 KCl(aq) + CaCO₃(aq)

Balance the chemical equation given below,and determine the number of moles of iodine that react with 40.0 g of aluminum. ___ Al(s) + _ I₂(s) → ___ Al₂I₆(s)

Magnesium burns in air with a dazzling brilliance to produce magnesium oxide: 2 Mg(s) + O₂(g) → 2 MgO(s) How many moles of O₂ are consumed when 2.10 mol of magnesium burns?

Automotive air bags inflate when sodium azide decomposes explosively to its constituent elements: 2 NaN₃(s) → 2 Na(s) + 3 N₂(g) How many grams of sodium azide are required to produce 25.0 g of nitrogen?

Identify the species oxidized. 2 Al³⁺(aq) + 2 Fe(s) → 2 Al(s) + 3 Fe²⁺(aq)

Lithium and nitrogen react to produce lithium nitride: 6 Li(s) + (g) → 2 Li₃N(s) How many moles of lithium nitride are produced when 0.750 mol of lithium react in this fashion?

According to the following balanced reaction,how many moles of HNO₃ are formed from 2.50 moles of NO₂if there is plenty of water present? 3 NO₂(g) + H₂O(l) → 2 HNO₃(aq) + NO(g)

Lithium and nitrogen react in a combination reaction to produce lithium nitride: 6 Li(s) + (g) → 2 Li₃N(s) How many moles of lithium are needed to produce 0.31 mol of N when the reaction is carried out in the presence of excess nitrogen?

How many moles of CuO can be produced from 0.450 mol of Cu₂O in the following reaction? 2 Cu₂O(s) + O₂(g) → 4 CuO(s)

According to the following balanced reaction,how many moles of NO are formed from 12.66 moles of NO₂if there is plenty of water present? 3 NO₂(g) + H₂O(l) → 2 HNO₃(aq) + NO(g)

Carbonic acid can form water and carbon dioxide upon heating.How much carbon dioxide is formed from 1.55 g of carbonic acid? H₂CO₃ → H₂O + CO₂

Global warming is thought to be caused by the increase of one particular gas.Name the gas.

According to the following balanced reaction,how many moles of CaO are required to exactly react with 3.22 moles of H₂O? CaO(s) + H₂O(l) → Ca(OH) ₂(s)

Consider the following reaction.How many moles of oxygen are required to produce 4.00 moles of water? Assume that there is excess C₃H₇SH present. C₃H₇SH(l) + 6 O₂(g) → 3 CO₂(g) + SO₂(g) + 4 H₂O(g)

How many moles of BCl₃ are needed to produce 25.0 g of HCl(aq) in the following reaction? BCl₃(g) + 3 H₂O(l) → 3 HCl(aq) + B(OH) ₃(aq)

Quiz 4: Chemical Quantities and Aqueous Reactions

Lithium and nitrogen react to produce lithium nitride: 6 Li(s) + (g) → 2 Li3N(s) How many moles of are needed to react with 0.550 mol of lithium?

How many grams of water react to form 6.21 moles of Ca(OH) 2? CaO(s) + H2O(l) → Ca(OH) 2(s)

Automotive air bags inflate when sodium azide decomposes explosively to its constituent elements: 2 NaN3(s) → 2 Na(s) + 3 N2(g) How many moles of N2 are produced by the decomposition of 1.75 mol of sodium azide?

How many molecules of HCl are formed when 70.0 g of water reacts according to the following balanced reaction? Assume excess ICl3. 2 ICl3 + 3 H2O → ICl + HIO3 + 5 HCl

According to the following balanced reaction,how many moles of Ca(OH) 2 will be formed from 3.22 moles of H2O? CaO(s) + H2O(l) → Ca(OH) 2(s)

How many grams of calcium chloride are needed to produce 5.00 g of potassium chloride? CaCl2(aq) + K2CO3(aq) → 2 KCl(aq) + CaCO3(aq)

Balance the chemical equation given below,and determine the number of moles of iodine that react with 40.0 g of aluminum. _____ Al(s) + _____ I2(s) → _____ Al2I6(s)

Magnesium burns in air with a dazzling brilliance to produce magnesium oxide: 2 Mg(s) + O2(g) → 2 MgO(s) How many moles of O2 are consumed when 2.10 mol of magnesium burns?

Automotive air bags inflate when sodium azide decomposes explosively to its constituent elements: 2 NaN3(s) → 2 Na(s) + 3 N2(g) How many grams of sodium azide are required to produce 25.0 g of nitrogen?

Identify the species oxidized. 2 Al3+(aq) + 2 Fe(s) → 2 Al(s) + 3 Fe2+(aq)

Lithium and nitrogen react to produce lithium nitride: 6 Li(s) + (g) → 2 Li3N(s) How many moles of lithium nitride are produced when 0.750 mol of lithium react in this fashion?

According to the following balanced reaction,how many moles of HNO3 are formed from 2.50 moles of NO2 if there is plenty of water present? 3 NO2(g) + H2O(l) → 2 HNO3(aq) + NO(g)

Lithium and nitrogen react in a combination reaction to produce lithium nitride: 6 Li(s) + (g) → 2 Li3N(s) How many moles of lithium are needed to produce 0.31 mol of N when the reaction is carried out in the presence of excess nitrogen?

How many moles of CuO can be produced from 0.450 mol of Cu2O in the following reaction? 2 Cu2O(s) + O2(g) → 4 CuO(s)

According to the following balanced reaction,how many moles of NO are formed from 12.66 moles of NO2 if there is plenty of water present? 3 NO2(g) + H2O(l) → 2 HNO3(aq) + NO(g)

Carbonic acid can form water and carbon dioxide upon heating.How much carbon dioxide is formed from 1.55 g of carbonic acid? H2CO3 → H2O + CO2

Global warming is thought to be caused by the increase of one particular gas.Name the gas.

According to the following balanced reaction,how many moles of CaO are required to exactly react with 3.22 moles of H2O? CaO(s) + H2O(l) → Ca(OH) 2(s)

Consider the following reaction.How many moles of oxygen are required to produce 4.00 moles of water? Assume that there is excess C3H7SH present. C3H7SH(l) + 6 O2(g) → 3 CO2(g) + SO2(g) + 4 H2O(g)

How many moles of BCl3 are needed to produce 25.0 g of HCl(aq) in the following reaction? BCl3(g) + 3 H2O(l) → 3 HCl(aq) + B(OH) 3(aq)

Lithium and nitrogen react to produce lithium nitride: 6 Li(s) + (g) → 2 Li₃N(s) How many moles of are needed to react with 0.550 mol of lithium?

How many grams of water react to form 6.21 moles of Ca(OH) ₂? CaO(s) + H₂O(l) → Ca(OH) ₂(s)

Automotive air bags inflate when sodium azide decomposes explosively to its constituent elements: 2 NaN₃(s) → 2 Na(s) + 3 N₂(g) How many moles of N₂ are produced by the decomposition of 1.75 mol of sodium azide?

How many molecules of HCl are formed when 70.0 g of water reacts according to the following balanced reaction? Assume excess ICl₃. 2 ICl₃ + 3 H₂O → ICl + HIO₃ + 5 HCl

According to the following balanced reaction,how many moles of Ca(OH) ₂ will be formed from 3.22 moles of H₂O? CaO(s) + H₂O(l) → Ca(OH) ₂(s)

How many grams of calcium chloride are needed to produce 5.00 g of potassium chloride? CaCl₂(aq) + K₂CO₃(aq) → 2 KCl(aq) + CaCO₃(aq)

Balance the chemical equation given below,and determine the number of moles of iodine that react with 40.0 g of aluminum. ___ Al(s) + _ I₂(s) → ___ Al₂I₆(s)

Magnesium burns in air with a dazzling brilliance to produce magnesium oxide: 2 Mg(s) + O₂(g) → 2 MgO(s) How many moles of O₂ are consumed when 2.10 mol of magnesium burns?

Automotive air bags inflate when sodium azide decomposes explosively to its constituent elements: 2 NaN₃(s) → 2 Na(s) + 3 N₂(g) How many grams of sodium azide are required to produce 25.0 g of nitrogen?

Identify the species oxidized. 2 Al³⁺(aq) + 2 Fe(s) → 2 Al(s) + 3 Fe²⁺(aq)

Lithium and nitrogen react to produce lithium nitride: 6 Li(s) + (g) → 2 Li₃N(s) How many moles of lithium nitride are produced when 0.750 mol of lithium react in this fashion?

According to the following balanced reaction,how many moles of HNO₃ are formed from 2.50 moles of NO₂if there is plenty of water present? 3 NO₂(g) + H₂O(l) → 2 HNO₃(aq) + NO(g)

Lithium and nitrogen react in a combination reaction to produce lithium nitride: 6 Li(s) + (g) → 2 Li₃N(s) How many moles of lithium are needed to produce 0.31 mol of N when the reaction is carried out in the presence of excess nitrogen?

How many moles of CuO can be produced from 0.450 mol of Cu₂O in the following reaction? 2 Cu₂O(s) + O₂(g) → 4 CuO(s)

According to the following balanced reaction,how many moles of NO are formed from 12.66 moles of NO₂if there is plenty of water present? 3 NO₂(g) + H₂O(l) → 2 HNO₃(aq) + NO(g)

Carbonic acid can form water and carbon dioxide upon heating.How much carbon dioxide is formed from 1.55 g of carbonic acid? H₂CO₃ → H₂O + CO₂

According to the following balanced reaction,how many moles of CaO are required to exactly react with 3.22 moles of H₂O? CaO(s) + H₂O(l) → Ca(OH) ₂(s)

Consider the following reaction.How many moles of oxygen are required to produce 4.00 moles of water? Assume that there is excess C₃H₇SH present. C₃H₇SH(l) + 6 O₂(g) → 3 CO₂(g) + SO₂(g) + 4 H₂O(g)

How many moles of BCl₃ are needed to produce 25.0 g of HCl(aq) in the following reaction? BCl₃(g) + 3 H₂O(l) → 3 HCl(aq) + B(OH) ₃(aq)