5. Which of these would cause a gas volume increase if all else was held constan

Question

5. Which of these would cause a gas volume increase if all else was held constant? a. Pressure increase b. Pressure decrease c. Temperature decrease d. Moles decrease 6. If 2 moles of CHa reacts with 2 moles of O2 in the reaction below, which of the following statements is true? CH4 (g) + 2O2 (g) CO2 (g) +2H2O(g) a· The mass of H2O formed will be twice the mass of CO2 formed b. Equal numbers of moles of H:0 and CO2 will be formed c. Equal masses of H:0 and CO; will be formed d. The limiting reactant will be CH e. H:O moles formed will be twice the moles of CO2 formed Which one of these gases would deviate most from the ideal gas law volume at 2000 atm and 300 K for 2 moles? 7. a. He b. Ne c. Ar d. Kr e. Xe How much heat is released if 69 grams of sodium metal reacts in the reaction shown below? 8. AHonn"-150k/ 2Na (s) + 2H20 (I) H2 (g) + 2NaOH (aq) a. 55 kJ b. 110 kJ c. 230 kJ d. 330 kJ e. 450 kJ

Explanation / Answer

5) b: pressure decrease. Boyle's law states that volume and pressure are inversely proportional at constant temperature.

6) e: as we can see from the balanced equation H2O moles will be formed twice the moles of CO2 formed.

7) e: Xe is the largest and heaviest noble gas, so there will be maximum intermolecular interactions among themselves resulting in deviation from ideal gas law.

8) 2 moles of Na gives energy = 150 kJ.

Since molar mass of Na is 23 g, i. e 46 g of Na gives energy = 150 kJ.

So 69 g of Na will give energy = (150/46) * 69 = 230 kJ, so the answer is 'C'.

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