Molar Volume Hwk 15 Show work:

1. How many liters of H2 are in 3.2 moles?

2. How many liters of NH3 are in 1.75 moles?

3. How many moles are in 0.50 liters of O2?

4. How many moles are in 5.5 liters of argon?

5. How many grams of N2 are in 45 liters of N2?

6. How many liters are in 2.85 mol of Kr?

7. How many liters are in 392 grams of CO2?

8. How many grams are in 1555 liters of C3H8?

342.8 kJ are absorbed

Explanation:

In the reaction:

4 NH3(g) + 5 O2(g) → 4 NO(g) + 6 H2O(l) ΔH° = 1168 kJ

As ΔH > 0, the heat is absorbed. Also, when 4 moles of NH3 are involved in the reaction, there are absorbed 1168 kJ.

Having this in mind, moles of NH3 in 20.00g are:

20.00g × (1mol / 17.0307g) = 1.174 moles

Thus, 1.174 moles of NH3 absorbed:

1.174 moles × (1168 kJ / 4 moles) = 342.8 kJ are absorbed.