How many H atoms are present in a sample of 3.5 grams of C6H12O6?

Question

thesmartone · Answer

How about trying the Chemistry section..

anonymous · Answer

Still technically a math question, but yes, probably better suited for Chemistry. At any rate...
$$\begin{array}{c|c}
\text{Element}&\text{Molecular mass (amu)}\
\hline
C&\sim12\
H&\sim1\
O&\sim16
\end{array}$$
The molar mass of $C_6H_{12}O_6$ is
$$(6\times12+12\times1+6\times16)\approx180\frac{\text{g}}{\text{mol}}$$
In 3.5 g of $C_6H_{12}O_6$, you have
$$3.5\text{ g}\times\frac{1}{180}\frac{\text{mol}}{\text{g}}\approx0.019\text{ mol}$$
Of the 0.019 mole of $C_6H_{12}O_6$, hydrogen takes up half, so there is about 0.0097 mole of $H$ in the sample. Multiplying by Avogadro's number will give you the number of hydrogen atoms.