28.3k views
1 vote
Solve the following conversion problems. Look out for “How many…” Remember: If the answer is in grams, multiply. If it’s in moles, divide.

Solve the following conversion problems. Look out for “How many…” Remember: If the-example-1
User Mostafaznv
by
8.4k points

1 Answer

1 vote

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

User Tai Paul
by
7.2k points