Other Chemistry Answers

 If 0.42 mole of helium occupies 9.9 L, how many moles must be added to inflate the balloon to 17.0 L? (round to two sig figs)

A sample of gas at 300 torr inside a steel tank is cooled from 500 °C to 0 °C. What is the final pressure of the gas in the steel tank? (round to one sig fig)

 A 60 mL tank holds 52.0 moles of helium. What would the volume be if there were 87.3 moles of helium? (round to one sig fig)

If 0.65 moles of hydrogen occupies 9.0 L, how many moles must be added to inflate the balloon to 15.6 L?(round to two sig figs)

A gas has a pressure of 0.370 atm at 50.0 °C. What is the pressure at standard temperature? (round answer to three sig figs)

 If a gas in a closed container is pressurized from 15.0 atm to 16.0 atm and its original temperature was 25.0 °C, what would the final temperature of the gas be (in °C)? **Hint: You still need to convert to Kelvin, then convert back to Celsius also round the answer to the correct sig figs

A 225 gram of mercury has a volume of 16.5 ml. What is the density of mercury? What is its specific gravity?

How many grams of CuO will be formed from the decomposition of 2.1 grams of Cu(OH)

2?

Calculate the initial temperature if 4.2 kg piece of gallium metal absorbed 630122 J of heat at 224.1 C. [Given specific heat, s, of Ga = 0.368 J g-1 C -1]

a titration of a 25.00 ml sample of a hydrochloric acid solution of unknown molarity reaches the equivalence point when 39.12 ml of 0.3204 M naOh solution has been added. what is the molarity of the Hcl solution