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Molar mass ( NH4)2SO4 =  132.1395 g/mol

So:

1 mole  ( NH4)2SO4 ---------------- 132.1395 g

moles (NH4)2SO4 ----------------- 3.30 g

moles (NH4)2SO4 = 3.30 * 1 / 132.1395

moles (NH4)2SO4 = 3.30 / 132.1395

=> 0.0250 moles of (NH4)2SO4

Answer A


Hope that helps!

Your answer should be: 0.0250 mol

Hope this helps!

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