Question 3.6: Determine (a) the number of moles of C in 10.00 g of natural...

Determine (a) the number of moles of C in 10.00 g of naturally occurring carbon and (b) the mass of 0.905 mole of sodium chloride.

Strategy Use molar mass to convert from mass to moles and to convert from moles to mass.

Setup The molar mass of carbon is 12.01 g/mol. The molar mass of a compound is numerically equal to its formula mass. The molar mass of sodium chloride (NaCl) is 58.44 g/mol.

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(a) 10.00  \cancel{g  C} = \frac{1  mol  C}{12.01  \cancel{g  C}} = 0.8326  mol  C

(b) 0.905  \cancel{mol  NaCl} × \frac{58.44  g  NaCl}{1  \cancel{mol  NaCl}} = 52.9  g  NaCl

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