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What is the mass of 2.20 moles of magnesium chloride, MgCl2? How many moles of nitrogen,...

What is the mass of 2.20 moles of magnesium chloride, MgCl2?

How many moles of nitrogen, N, are in 82.0 g of nitrous oxide, N2O?

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Answer #1

number of moles of MgCl2= 2.20 moles

molar mass of MgCl2= 95.21 g/mole

number of moles = mass of solute/molar mass

mass of solute = number of moles x molar mass

mass of MgCl2= 2.20x95.21=209.462 g

mass of MgCl2= 209.46 grams.

b)

mass of N2O= 82.0g

molar mass of N2O = 44.0g/mole

number of moles of N2O = mass/molar mass = 82.0/44.0= 1.864 moles

number of moles ofN2O = 1.864 moles

number of moles of Nitrogen = 1.864x2= 3.728 moles

number of moles of Nitrogen atoms= 3.73 moles

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