1. A chemist observed a gas being evolved in a chemical reactionand collected some of it for analysis. It was found to contain 80%carbon and 20% hydrogen. It was also observed that 500. mL of thegas at STP weighed 0.6695 g.
What is the empirical formula for thecompound?
What is its molecular formula?
2. The ratio of an unknown gas effuses at a rate that is 0.325times that of argon gas. Calculate the molar mass of the unknowngas in g/mol.
3. 25 g of argon are placed in a 20 L container and the pressureis determined to be 1.25 atm. What is the temperature of thegas?
4. You have 10 mL of gas in a syringe at a certain pressure andtemperature. Assuming the temperature remains constant, whathappens to the pressure if you depress the syringe to 5 mL?
5. A substance requires 50.0 J of heat to raise its temperatureby 6.00°C. If the mass of the substance is 5.00 g, what is thespecific heat of the substance?
