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Question 7.10: A salt shaker contains 73.7 g of NaCl. How many moles of NaC...

A salt shaker contains 73.7 g of NaCl. How many moles of NaCl are present?

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STEP 1   State the given and needed quantities.

ANALYZE THE PROBLEM Given Need Connect
73.7 g of NaCl moles of NaCl molar mass

STEP 2   Write a plan to convert grams to moles.

grams  of  NaCl      \boxed{Molar mass }  →      moles  of  NaCl

STEP 3   Use Avogadro’s number to write conversion factors.

(1 \times 22.99) + (1 \times 35.45) = 58.44 g/mole

\boxed{\begin{array}{l} 1  mole  of  NaCl = 58.44  g  of  NaCl \\ \frac{58.44  g  NaCl}{1  mole  NaCl}         and         \frac{1  mole  NaCl}{58.44  g  NaCl} \end{array}}

STEP 4   Set up the problem to calculate the number of particles.

73.7  \cancel{g  NaCl}    \times    \boxed{\frac{1 mole NaCl}{58.44  \cancel{g  NaCl}} }  =  1.26  moles  of  NaCl

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