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labwork [276]
2 years ago
14

A 650.0 g hard-water sample contains 101 mg Ca.what is this concentration in parts per million

Chemistry
1 answer:
ki77a [65]2 years ago
8 0

Answer:

= 155 ppm

Explanation:

PPM also refers to parts per million, it represents a low concentration of a solution. It represents 0.001 gram or a milligram in a 1000 mL, equivalent to 1 mg per liter

Given that;

101 mg of Ca in 650.0 g of water

1 ppm = 1 mg/L

650 g = 650 mL = 0.65 L

Therefore;

= 101 mg/ 0.65 L

=  155.38 mg/L

<u>= 155 ppm</u>

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Explanation:

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Ammonia can be produced in the laboratory by heating ammonium chloride
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Answer:

Mass = 2.89 g

Explanation:

Given data:

Mass of NH₄Cl = 8.939 g

Mass of Ca(OH)₂ = 7.48 g

Mass of ammonia produced = ?

Solution:

2NH₄Cl   +  Ca(OH)₂     →    CaCl₂ + 2NH₃ + 2H₂O

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Now we will compare the moles of ammonia with both reactant.

                      NH₄Cl          :          NH₃

                          2              :           2

                         0.17          :          0.17

                   Ca(OH)₂         :          NH₃

                        1                :           2

                    0.10              :          2/1×0.10 = 0.2 mol

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Mass of ammonia:

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Mass = 0.17 mol × 17 g/mol

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