Question

How many grams of ammonia (NH3) are there in 1.19 mol of the compound?

What is the mass (in grams) of 9.23 × 1024 molecules of methanol (CH3OH)?

How many atoms of phosphorus are in 8.20 mol of copper(II) phosphate?

How many moles of N are in 0.215 g of N2O?

Answer 1

Grams of ammonia (NH3) are there in 1.19 mol of the compound:

mole= weight / Molecular weight

weight= mole x molecular weight= 1.19 mol x 17 g/mol= 20.23 g is the weight of ammonia.

the mass (in grams) of 9.23 × 1024 molecules of methanol (CH3OH):

1 mole of methanol = 6.022 x 10²³ molecules of methanol

X mole of methanol= 9.23 × 10²⁴ molecules of methanol

so, after cross multiplication X= 15.327 moles of methanol

use, mole= weight / Molecular weight

weight= mole x molecular weight= 15.327 mol x 32.04 g/mol = 491.077 g of methanol