Question

Not a timed or graded assignment. Please provide given, conversion factor, orientation of conversion factor in dimensional analysis setup. Quick answer = amazing review :)

Answer 1

To find the number of moles of a given mass of a compound, we have to use its molar mass. In this case, we have to use the molar mass of hydrogen peroxide (H2O2), which is 34 g/mol (you can calculate it by using the periodic table, the molar mass of hydrogen (H) is 1 g/mol and the molar mass of oxygen (O) is 16 g/mol).

The conversion from 4.0 grams to moles would be:

`4.0gH_2O_2\cdot\frac{1\text{ mol }H_2O_2}{34\text{ g }H_2O_2}=0.117\text{ moles }H_2O_2\approx0.12\text{ moles }H_2O_2.`

The answer is that there are 0.12 moles of hydrogen peroxide in 4.0 g of this compound.