Answer to Question #21612 in Organic Chemistry for Anjurie

Question

Sulphuric acid reacts with potassium to form potassium sulphate and hydrogen. Determine the mass of potassium sulphate produced if 6.0g of hydrogen wa also formed

Answer 1

2K + H₂SO₄ = K₂SO₄ + H₂
if m(H₂) = 6 g, so
n(H₂) = 6 g / 2 g/mol = 3 moles;
n(H₂) : n(K₂SO₄) = 1 : 1;
n(K₂SO₄) = 3 moles;
m(K₂SO₄) = n(K₂SO₄) * M(K₂SO₄)
M(K₂SO₄) = 39*2 + 32 + 64 = 174 g/mol;
m(K₂SO₄) = 3 moles * 174 g/mol = 522g