Answer to Question #102720 in Inorganic Chemistry for Olga

Question

Tin (II) fluoride, also known as stannous fluoride, is added to some dental products to help prevent
cavities. How many moles of tin (II) fluoride can be made from 55.0 g of hydrogen fluoride, HF, if there
is plenty of tin?

Answer 1

Sn+2HF=>SnF2+H2
Molar mass of HF=1+19=20g/mol
Moles of HF=55g/(20g/mol)=55/20=2.75mol
From 2 moles of HF we can get 1 mol of SnF2
according to the equation
We have 2.75 moles of HF, so 
moles of SnCl2=2.75/2=1.375 moles
Answer:1.375 moles