Question 189774

1) A gaseous mixture contains oxygen gas and nitrogen gas. If the weight of oxygen gas is 20.0 grams and its mole fraction is 0.18, find the weight of nitrogen gas in the mixture.

2) A solution of sodium hydroxide has a density of 1.14g/mL and contains 32.8% sodium hydroxide by mass. If 40.0 mL of this solution is diluted with 30.0 mL of water, what is the concentration of the diluted sodium hydroxide?

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