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forsale [732]
3 years ago
5

How many grams of calcium are made up by 2.68 x 1023 atoms?

Chemistry
1 answer:
raketka [301]3 years ago
5 0

Answer:

Mass = 17.8 g

Explanation:

Given data:

Number of atoms of Ca = 2.68 × 10²³

Mass in gram = ?

Solution:

Avogadro number:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ atoms

2.68 × 10²³ atoms × 1 mole  /6.022 × 10²³ atoms

0.445 mol

Mass in gram;

Mass = number of moles ×  molar mass

Mass = 0.445 mol  ×  40 g/mol

Mass = 17.8 g

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For each of the following units and concentration values, mention if they are parts per million (ppm), parts per billion (ppb) o
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Answer:

a) ppm

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b) 1000 mg are 1 g, and 1000 g are 1 liter, so 1,000,000 grams are one liter.

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Answer:

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