Chemistry Homework Help!!?

2016-05-24 6:00 pm

2) ____Na2SO4(aq) + ___Al(NO3)3(aq) -----> ___Al2(SO4)3(s) + ___NaNO3(aq)
A. Give the correct coefficients to balance the reaction
B. What si the molar mass (formula weight) of aluminum sulfate Al2(SO4)3(s)?
C. If 191mL of 1.25M aluminum nitrate is added to an excess of sodium sulfate, how many gram of aluminum sulfate will eb produced? (include formula if there is one)

回答 (1)

micatkie

2016-05-24 6:33 pm

✔ 最佳答案

2)
A.
3Na₂SO₄(aq) + 2Al(NO₃)₃(aq) → Al₂(SO₄)₃(s) + 6NaNO₃(aq)

B)
Molar mass of Al₂(SO₄)₃ = (26.98×2 + 32.06×3 + 16.00×12) g/mol = 342.14 g/mol

C)
No. of moles of Al(NO₃)₃ reacted = (1.25 mol/L) × (191/1000 L) = 0.2388 mol

According to the equation, mole ratio Al(NO₃)₃ : Al₂(SO₄)₃ = 2 : 1
No. of moles of Al₂(SO₄)₃ produced = (0.2388 mol) × (1/2) = 0.1194 mol
Mass of Al₂(SO₄)₃ produced = (342.14 g/mol) × (0.1194 mol) = 40.85 g

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