Number Of Moles And Molecules In 0.500g Tablet Of Aspirin

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Number Of Moles And Molecules In 0.500g Tablet Of Aspirin

The chemical name for aspirin is acetylsalicyclic acid. Its molecular formulas is HC_{9}H_{7}O_{4}.

(a) How many moles of HC_{9}H_{7}O_{4} are in 0.500 g tablet of aspirin?

(b) How many molecules of HC_{9}H_{7}O_{4} are in this aspirin tablet?

**The strings**:
S_{7}P_{1}A_{15} (containership - mass).
**The math**:

Pj Problem of Interest is of type *containership* (mass).
**(a)** Molar mass of HC_{9}H_{7}O_{4} = 1 + 108 + 7 + 64 = 180 g

So, 0.500 g of aspirin is 0.500/180 = 0.00277 mol of aspirin.
**(b)** 1 mole contains the Avogadro number of molecules = 6.02 x 10^{23} molecules

So, 0.00277 mol will contain 0.00277 x 6.02 x 10^{23} = 0.0167 x 10^{23} = 1.67 x 10^{21} molecules of aspirin.

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