There are 3.45 moles of (nh4)2 so4, how many grams is this?

455.4 g

Explanation:

Data given:

no. of moles of (NH₄)₂SO₄= 3.45 mol

mass of (NH₄)₂SO₄ = ?

Solution

Formula will be used

           no.of moles = mass in grams / molar mass

Rearrange the above equation for mass

           mass in grams = no. of moles x molar mass . . . . . . . . (1)

molar mass of (NH₄)₂SO₄

molar mass of (NH₄)₂SO₄ = 2(14 + 4(1)) + 32 + 4(16)

molar mass of (NH₄)₂SO₄ = 2 (14 +4) + 32 + 64  

molar mass of (NH₄)₂SO₄ = 2 (18) + 32 + 64

molar mass of (NH₄)₂SO₄ = 36 + 32 + 64 = 132 g/mol

Put values in equation 1

           mass in grams = 3.45 mole x 132 g/mol

           mass in grams = 455.4 g

So,

mass of (NH₄)₂SO₄ = 455.4 g