The moles and mass are as follows;
10) 624.69g 11) 111 grams 12) 284.08 grams 13) 2 moles
14) 1.002 moles 15) 0.5 moles 16. 1.999moles
How do we find the respective moles and mass?
10. 3 moles of BaCl₂
Molar mass of BaCl₂ = 208.23 g/mol
Mass = 3 × 208.23g/mol = 624.69g
11. 1.5 moles of Ca(OH)₂:
Molar mass of Ca(OH)₂ = 74 g/mol
Mass = 1.5 moles × 74 g/mol = 111 grams
12. 2 moles of Na₂SO₄:
Molar mass of Na₂SO₄ = 142.04g/mol
Mass = 2 moles × 142 g/mol = 284.08 grams
13. 34 grams of NH₃:
Molar mass of NH₃ = 17 g/mol (N: 14 g/mol + 3 H: 1 g/mol each)
Moles = 34 grams / 17 g/mol = 2 moles
14. 183 grams of Ni(NO₃)₂
Moles = 183 g/Molar mass of Ni(NO₃)₂ = 183 g/182.703g/mol
Moles = 1.002
15. 171 grams of C₁₂H₂₂O₁₁:
Molar mass of C₁₂H₂₂O₁₁ = 342 g/mol (12 C: 12 x 12 g/mol + 22 H: 22 x 1 g/mol + 11 O: 11 x 16 g/mol)
Moles = 171 grams / 342 g/mol ≈ 0.5 moles
16. 454 grams of C₇H₅N₃O₆
Moles = 454 grams / 227.131 g/mol
Moles = 1.999