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Question 7.7: How many moles of carbon are present in 1.50 moles of aspiri...

How many moles of carbon are present in 1.50 moles of aspirin, C_{9}H_{8}O_{4}?

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STEP 1   State the given and needed quantities.

ANALYZE THE PROBLEM Given Need Connect
1.50 moles of aspirin, C_{9}H_{8}O_{4} moles of C subscripts in formula

STEP 2   Write a plan to convert moles of a compound to moles of an element.

moles  of  C_{9}H_{8}O_{4}      \boxed{Subscript }→     moles  of  C

STEP 3  Write t he equalities and conversion factors using subscripts.

\boxed{\begin{array}{l} 1  mole  of  C_{9}H_{8}O_{4} = 9  moles  of  C  \\ \frac{9  moles  C}{1  mole   C_{9}H_{8}O_{4}}         and         \frac{1  mole   C_{9}H_{8}O_{4}}{9  moles  C} \end{array}}

STEP 4   Set up the problem to calculate the moles of an element.

1.50  \cancel{moles  C_{9}H_{8}O_{4}}    \times    \boxed{\frac{9  moles  C}{1  \cancel{mole  C_{9}H_{8}O_{4}}} }  =  13.5  moles  of  C

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