What is the percent by weight of sodium in sodium sulfate ? 16.2% 46.0% 31.4% 32

Question

What is the percent by weight of sodium in sodium sulfate ? 16.2% 46.0% 31.4% 32.4% none of the above How much methane is required to produce 55.0 g of carbon dioxide, when burned in excess oxygen? 55.0 g 1.25 g 151 g 12.5 g 20.0 g What is the molarity of a hydrochloric acid solution. if 15.78 mL of acid b needed to completely neutralize 10.00 mL of a 0.2000 M sodium hydroxide solution? 7.890 M 0.1267 M 0.3156 M 0.03156 M 31.56M How many mL of 1.80 M hydrochloric acid are required to completely react with 30.0 grams of calcium hydroxide? 450. mL 165 mL 575 mL 225 mL none of the above A gas has a volume of 230. mL and a pressure of 560 torr. What must the pressure be in order for the gas to have a volume of 345 mL at the same temperature? 1.50 torr 103 torr 142 torr 840 torr none of the above Predict the products from the following reaction: Ba(OH)_2(aq) + H_2SO_4(aq) rightarrow Ba_2(SO_4)_3(aq) + 2H_2O(l) BaSO_4(s) + 2H_2O (l) BaSO_4(aq) + 2H_2O (l) BaSO_4(aq) + H_2(g) + O_2(g) No reaction Which is the correct name for CuSO_4? copper sulfate copper (II) sulphite copper (II) sulfate copper (I) sulfate curium (II) sulfite

Explanation / Answer

21) The formula of Sodium sulfate is Na2SO4 . Its molar mass is 142 g/mol

Molar mass of S is 32 g/mol

1 mole= 142 g of Na2SO4 contains 2 moles = 2x32=64 g of S

So % S = [( mass of S) / (mass of Na2SO4)]x100

= (64 / 142) x 100

= 46.0 %

Therefore option (b) is correct

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