4. If a 200 g sample of carbon dioxide gas (44.01 g/mol) has a volume of 3.5 L,

Question

4. If a 200 g sample of carbon dioxide gas (44.01 g/mol) has a volume of 3.5 L, what is the volume of 800 g of carbon dioxide at the same pressure and temperature? (7 points) A. 14 L B. 3.5L C. 14 g D. 3.5 g E. 44 L 5. 2 L of air is collected at room temperature (298 K) and at 745 mm Hg. What would be the temperature of the gas if the pressure was changed to 860 mm Hg with a volume change to 4.5 L. (7 points) A. 273 K B. 1490 K C. 0.00129 K D. 774 K E. 530 K 6. Circle the insoluble compound from the list below. (7 points) A. Sodium nitrate B. Silver nitrate C. Ammonium sulfate D. Copper phosphate E. Potassium phosphate 7. Draw the structure of sodium nitrate showing bonds as lines and lone pairs and charges. (6 points) 8. Consider a 22.4 Lcontainer of a nitrogen and methane gas mixture at standard temperature and pressure If there are 0.3 moles of methane, 0.3 moles of nitrogen, and 0.4 moles of argon, how much pressure is exerted by the argon in atm? (7 points) A. 22.4 atm B. 44.2 atm C. 3 atm D. 0.3 atm E. 0.4 atm

Explanation / Answer

4)

mass is directly proportional to molar mass

we need to use:

V/n = constant

Here mass becomes 4 times.

So, number of mol becomes 4 times

From relation: V/n = constant

V should also become 4 times

V2 = 4*V1

= 4*3.5 L

= 14 L

Answer: A

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