Answer:
85g
Explanation:
To convert the moles of a substance to grams we need to know the molar mass of the substance. We, as first, must obtain the molar mass of (NH₄)₂S as follows:
There are 2 atoms of N, 8 of H and 1 of S:
N = 2*14g/mol = 28g/mol
H = 8*1g/mol = 8g/mol
S = 1*32g/mol = 32g/mol
Molar mass: 68g/mol
That means 1 mole of (NH₄)₂S has a mass of 68g.
1.25moles have a mass of:
1.25moles * (68g/mol) =
85g
