Converting between Grams and Moles Learning Goal: To convert between mass and nu

Question

Converting between Grams and Moles Learning Goal: To convert between mass and number of moles. The conversion factor between mass and number of moles is called molar mass. By consulting the periodic table we can determine that the molar mass of NaCl is 23.0 g/mole + 35.5 g/mole = 58.5 g/mole This number tells us that 1 mole of NaCl has a mass of 58.5 g. The conversion factors are Here is an example of the conversion of 12.0 moles of NaCl to grams using the first conversion factor: 12.0 moles times 58.5/1 moles = 702 g What is the mass of 4.20 moles of magnesium chloride, MgCl_2? Express your answer with the appropriate units. How many moles of nitrogen, N, are in 61.0gof nitrous oxide, N_2O? Express your answer with the appropriate units.

Explanation / Answer

A) Mass = Moles * Molecular Weight = 4.2*95 = 399 g

B) Moles = Mass / Molecular Weight = 61 / 44 = 1.37 moles

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