can react with H2 to form the compound N2H4.(e) A sample of N2H4 has a mass of 25g. Identify the numerical quantity that is needed to convert the number of grams of N2H4 to the number of moles of N2H4. (You do not need to do the actual calculation.)
Question
can react with H2 to form the compound N2H4.(e) A sample of N2H4 has a mass of 25g. Identify the numerical quantity that is needed to convert the number of grams of N2H4 to the number of moles of N2H4. (You do not need to do the actual calculation.)
Solution
The numerical quantity needed to convert the number of grams of N2H4 to the number of moles of N2H4 is the molar mass of N2H4. The molar mass of a compound is the sum of the molar masses of its constituent elements. For N2H4, this would be the molar mass of nitrogen (N) times 2 plus the molar mass of hydrogen (H) times 4. You can find these values on the periodic table: Nitrogen (N) has a molar mass of approximately 14 grams per mole and Hydrogen (H) has a molar mass of approximately 1 gram per mole. Therefore, the molar mass of N2H4 is (142) + (14) = 32 grams per mole. This is the numerical quantity you would use to convert grams of N2H4 to moles of N2H4.
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