How many molecules are there in 1.54 kg of hydrazine,N₂H₄?

Question

Quizplus · Accepted Answer

To solve this problem, we need to use the Avogadro's number which is approximately 6.022 × 10^23 per mole. 
First, we need to find the number of moles of hydrazine:

molar mass of hydrazine (N2H4) = (2x14.01) + (4x1.008) = 32.044 g/mol

Number of moles = 1.54 kg / 32.044 g/mol = 48.08 mol

Now, we can find the number of molecules:

Number of molecules = Avogadro's number x number of moles

= (6.022 x 10^23) x 48.08

= 2.90 x 10^25

Therefore, the best choice is B with the number of molecules in scientific notation.

How Many Molecules Are There in 1