Since a mole of atoms contains 6.0221 x 1023 atoms, there are 2.2452 x 1022 zinc atoms and 5.9230 x 1020 copper atoms in a penny, for a total of 2.3044 x 1022 atoms in a penny. Public Domain Image, source: NASA/JPL-Caltech

3 0

3 years ago

A 10.11 g sample of NaBr contains 22.34 % Na by mass. Considering the law of constant composition (definite proportions), how ma

Ksenya-84 [330]

Answer:

$1.58\ \text{g}$

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

$7.09\times \dfrac{22.34}{100}=1.583906\approx 1.58\ \text{g}$

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

8 0

3 years ago

Which of these is NOT a unit of pressure psi atm mm Torr

Alexxx [7]

I think mm is not a unit of pressure

7 0

3 years ago