Question

How many moles are present in 21.2g HCl?

Answer 1

Answer:

0.58 moles

Explanation:

moles= mass/molec.mass

Answer 2

Answer:

hydrogen chloride = H+1, Cl-1 = HCl

H = 1.008

Cl = 35.453

HCl = 36.458 g/mol

21.1 g x 1 mol HCl/36.458g = .579 mol HCl

The ions of hydrogen chloride balance out so the formula is HCl.

You add the atomic weights of the individual elements to get a

grams/mole for the molecule HCl. You take the information that was

given, 21.1g of HCl, and multiply it by the fact that 1 mole of HCl

is 36.458g. Grams cross out and you're left with 21.1 x 1 mol /

36.458 = 0.579 mol. This is how many moles are in 21.1g of HCl.