The molar mass of gallium (\ce{Ga}GaG, a) is \pu{69.72 g/mol}69.72 g/mol69, point, 72, space, g, slash, m, o, l. Calculate the number of atoms in a \pu{27.2 mg}27.2 mg27, point, 2, space, m, g sample of \ce{Ga}GaG, a.
Write your answer in scientific notation using three significant figures.
\text{atoms Ga}atoms Gastart text, a, t, o, m, s, space, G, a, end text
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The AP Chemistry exam includes a section of equations and constants that you can reference during the exam. One of the constants included in this section is Avogadro's number, which is shown below.
\text{Avogadro's number} = 6.022 \times 10^{23}\; \text{mol}^{-1}Avogadro’s number=6.022×10
23
mol
−1