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Question 7: A technician weighs 40 g of sodium. How many moles of formula units are in the sample?


Strategy: First we find the formula mass of NaCl. This will give the mass of 1 mole of NaCl. Then using the formula, Number of moles of NaCl = Mass of NaCl/Molar mass of NaCl to calculate the number of moles of the substance.

Formula mass of NaCl = 23 + 35.5 = 58.5 g = molar mass of NaCl.

No of moles in the given amount of NaCl = 40/58.5 = 0.683


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