How many atoms are in 137 g of calcium?
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Ответ:
2.047x 10²⁴ atoms
Explanation:
To calculate the n° of moles of Ca that they are in 137 g, we can use the next relation:
n = mass/atomic mass = (137 g)/(40.078 g/mol) = 3.4 mol.
For each mole of a molecule contains Avogadro's number of molecules (NA = 6.022 x 10²³).
Using cross multiplication:
1 mole of Ca contains → 6.022 x 10²³ atoms.
3.4 moles of Ca contains → ??? atoms.
∴ 3.4 mole of (137 g) Ca contain = (3.4 mol)(6.022 x 10²³) = 2.047x 10²⁴ atoms.
Ответ:
The percent composition of fluorene is 33.08 % and benzoic acid is 36.03 %.
Explanation:
We are given:
Mass of mixture = 544 mg
Mass of fluorene after purification =![1.80\times 10^2mg=180mg](/tpl/images/0188/8478/463a7.png)
Mass of benzoic acid after purification = 196 mg
To calculate the percentage composition of a substance in a mixture, we use the equation:
For fluorene:
Hence, the percent composition of fluorene is 33.08 %
For benzoic acid:
Hence, the percent composition of benzoic acid is 36.03 %