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chemistry

1.
Individual samples of O2, N2 and He are present in three containers. Each exerts a pressure of 1.50atm. If all three gases are forced into the same 1.0L container with no change in temperature.
(a)
What will be the resulting pressure?
(b)
What are the partial pressures of each gas?
2.
Analysis of a sample of a gaseous compound shows that it contains 85.7% carbon and 14.3% hydrogen by mass. At standard conditions, 100ml of the compound has a mass of 0.188g.
(a)
What is the empirical formula of the compound?
(b)
A 5L flask at a certain temperature containing 0.5 moles of He and 2moles of O2 has a total pressure of 10 atm. Determine the partial pressure of each of the gases.
(c)
(I) What is effusion?
(II) Calculate the ratio of effusion of methane to that of sulphur dioxide.