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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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Colloid

Explanation:

A lotion of this type is a typical colloid mixture.

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They have the following properties:

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3 years ago
Which substance is important in making plastics?
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3 years ago
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Draw a chair conformation for cis-1-bromo-2,4-dimethylcyclohexane showing equatorial and axial positions at the carbon atoms bea
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Answer:

See attachment.

Explanation:

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2 years ago
How many moles and molecules are there in 250g of hydrogen nitrate, HNO3
Viefleur [7K]

Answer:

Number of molecules = 23.9  × 10²³ molecules

Number of moles = 3.97 mol

Explanation:

Mass of HNO₃ = 250 g

Number of moles = ?

Number of molecules = ?

Solution:

Number of moles = mass / molar mass

Number of moles = 250 g/63 g/mol

Number of moles = 3.97 mol

Number of molecules:

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.

For example,

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1.008 g of hydrogen = 1 mole = 6.022 × 10²³ atoms of hydrogen

For 250 g of HNO₃:

250 g/ 63 g/mol = 3.97 mole

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3 years ago
What must always be the same on both sides of a chemical equation?
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