How many grams of copper metal are present in a 4.15g sample of copper(ii) fluoride dihydrate

To solve this we must know the molar mass of the copper(II) fluoride dihydrate and molar mass of copper metal
the molar mass of copper(II) fluoride dihydrate is  137.573 g/mol .
molar mass of copper 63.456 g/mol

mass copper metal = 4.15 g copper(II) fluoride dihydrate ( 1 mol copper(II) fluoride dihydrate / 137.573 g copper(II) fluoride dihydrate) ( 1 mol copper / 1 mol copper(II) fluoride dihydrate) (  63.456 g copper / 1 mol copper)

mass copper metal =1.914 g copper metal

The answer is c) pyrite