How many grams of oxygen are in 8.50 g of formaldehyde,CH2O?
A) 2.12 g
B) 2.83 g
C) 4.25 g
D) 4.53 g
E) 16.0 g
Correct Answer:
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Q21: A certain compound is 66.7% carbon,3.74% hydrogen,and
Q22: Calculate the percentage composition of calcium chlorate.
A)19.4%
Q23: Calculate the percent nitrogen in ammonium nitrate.
A)17.5%
B)21.9%
C)22.9%
D)33.3%
E)35.0%
Q24: From the following,pick those that are empirical
Q25: Which of the following are empirical formulas?
i.C10H8
ii.CH2
iii.Al2Cl6
iv.NO2
v.Hg2Cl2
A)i
Q27: What is the mass of 0.0490 mole
Q28: Which off the following provides the conversion
Q29: Calculate the number of moles in 15.8
Q30: How much silver nitrate must be measured
Q31: What is the mass of 7.24 ×
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