Question

A 10.11 g sample of NaBr contains 22.34 % Na by mass. Considering the law of constant composition (definite proportions), how many grams of sodium does a 7.09 g sample of sodium bromide contain

Answer 1

`1.58\ \text{g}`

Step-by-step explanation:

10.11 g sample of
`NaBr` contains 22.34%
`Na` by mass

According to the law of constant composition the if one sample of
`NaBr` has 22.34% of
`Na` by mass then any other sample of
`NaBr` will have the same percentage of the amount of
`Na`.

For a sample of 7.09 g we have

`7.09* (22.34)/(100)=1.583906\approx 1.58\ \text{g}`

The mass of sodium in the required sample is
`1.58\ \text{g}`.