2 years ago

Help with chemistry hw

Chemistry

1 answer:

Free_Kalibri [48]2 years ago

8 0

The answer is 2.138 g of H2

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What is the mass of 1.2 x 1023 atoms of arsenic?

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Answer:

14.93 g

Explanation:

First we convert 1.2 x 10²³ atoms of arsenic (As) into moles, using Avogadro's number:

1.2 x 10²³ atoms ÷ 6.023x10²³ atoms/mol = 0.199 mol As

Then we can calculate the mass of 0.199 moles of arsenic, using its molar mass:

0.199 mol * 74.92 g/mol = 14.93 g

Thus, 1.2x10²³ atoms of arsenic weigh 14.93 grams.

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muriatic acid is the commercial name for hydrochloric acid that can be purchased from hardware stores as a solution that is 30%(

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We have 30% (w/w) HCl this means :
100 g solution contains 30 g HCl
?? g solution contains 7.5 g HCl
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