Running for presindentr vote narsha the cow 2020

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If 1.63 times 10 negative 4 of helium dissolves in 100.0g of water, what is the concentration in parts per million

Calculate the percent composition by mass of each element in al(oh)3. use at least three significant figures.

How many grams of ammonia would be produced by the decomposition of 16.93 mlof hydrazine? (the density of hydrazine is 1.021g/ml)