AP Chemistry stoichiometry and chemical calculations quiz quiz

$6.022 \times 10^{23}$

$1.204 \times 10^{24}$

$3.011 \times 10^{23}$

$9.11 \times 10^{-31}$

$16.00$ g/mol

$17.01$ g/mol

$18.02$ g/mol

$20.02$ g/mol

$0.500$ mol

$1.00$ mol

$2.00$ mol

$44.0$ mol

$1.204 \times 10^{24}$

$2.00 \times 10^{23}$

$3.01 \times 10^{23}$

$6.022 \times 10^{23}$

The coefficients in front of formulas

The charges on the atoms

The chemical symbols

The subscripts in a formula

$2\,\text{CH}_4 + \text{O}_2 \rightarrow 2\,\text{CO}_2 + \text{H}_2\text{O}$

$\text{CH}_4 + 3\,\text{O}_2 \rightarrow \text{CO}_2 + 2\,\text{H}_2\text{O}$

$\text{CH}_4 + \text{O}_2 \rightarrow \text{CO}_2 + \text{H}_2\text{O}$

$\text{CH}_4 + 2\,\text{O}_2 \rightarrow \text{CO}_2 + 2\,\text{H}_2\text{O}$

$5.6\%$

$50.0\%$

$11.2\%$

$88.8\%$

$\text{CH}$

$\text{CH}_2$

$\text{CH}_4$

$\text{C}_2\text{H}_5$

$\text{CH}$

$\text{C}_2\text{H}_2$

$\text{C}_3\text{H}_3$

$\text{C}_6\text{H}_6$

Air

Carbon dioxide gas

Brass

Saltwater

$5.00 + x$

$5.00 - x$

$5.00x$

$x$

Because calculators require it

To change the number of significant figures allowed

To make the numbers larger

To avoid accumulating rounding error in intermediate steps

Markers award points for correct setup and reasoning, not only the final number

It changes the molar mass

It is only needed for multiple-choice questions

It is required to use a calculator