Answer to Question #155264 in General Chemistry for Kimberli

Question

1- How many moles of NH3 in 51 grams?

2- How many moles of NH3 in 8.5 grams?

3- 22 grams of CO2 equals?

4- 88 grams of CO2 equals?

5- what is the mass of 2.5 moles of LiSO4 times 2 H2O

6- what is the mass of 5 moles of LiSO4 times 2 H2O

7- A sample of a compound contains 23 grams of sodium, 32 grams of sulfur, 12 grams of carbon, and 14 grams of nitrogen. What is the mole ratio of sodium to sulfur to carbon to nitrogen in this compound?

8- A sample of a compound contains 23 grams of sodium, 32 grams of sulfur, 12 grams of carbon, and 14 grams of nitrogen. What is the mole ratio of sodium to sulfur to carbon to nitrogen in this compound?

Answer 1

1. M.M of NH₃ = 17gmol^-1

Mole = Mass/ Molar Mass

= 51g/ 17gmol^-1

= 3mole

2. M.M of NH₃ = 17gmol^-1

Mole = Mass/ Molar Mass

= 8.5g/ 17gmol^-1

= 3mol

3. M.M of CO₂ = 44gmol^-1

Mole = 22g/ 44gmol^-1

= 0.5mol

4. M.M of CO₂ = 44gmol^-1

Mole = 88g/ 44gmol^-1

= 2mol

5. LiSO₄ = 4+32+64 = 100gmol^-1

Mass = 2.5mol × 100gmol^-1

= 25g

6. 50g

7. 1:1:1:1

8.1:1:1:1