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3 years ago

If you have an atom with 8 protons, 9 neutrons and 10 electrons, what is its mass number?

Chemistry

1 answer:

djverab [1.8K]3 years ago

6 0

17 is the atomic mass

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Which of the following substances act as a catalyst in the body?

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Enzymes act like catalyst.

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2 years ago

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Calculate the solubility of copper(II) hydroxide, Cu(OH)2, in g/L

Oduvanchick [21]

Answer:

Ksp = [ Cu+² ] [ OH-] ²

molar mass Cu(oH )2 ==> M= 63.546 (1) + 16 (2) + 1 (2) = 97.546 g/mol

Ksp = [ Cu+² ] [ OH-] ²

Ksp [ cu (OH)2 ] = 2.2 × 10-²⁰

|__________|___Cu+² __|_2OH-____|

|Initial concentration(M)|___0__|_0______|

|Change in concentration(M)|_+S |__+2S__|

|Equilibrium concentration(M)|_S _|2S___|

Ksp = [ Cu+² ] [ OH-] ²

2.2 ×10-²⁰ = (S)(2S)²= 4S³

$s = \sqrt[3]{ \frac{2.2 \times {10}^{ - 20} }{4} } = 1.8 \times {10}^{ - 7}$

S = 1.8 × 10-⁷ M

The molar solubility of Cu(OH)2 is 1.8 × 10-⁷ M

Solubility of Cu (OH)2 =

$Cu (OH)2 = \frac{1.8 \times {10}^{ - 7} mol \:Cu (OH)2 }{1L} \times \frac{97.546 \: g \: Cu (OH)2}{1 \: mol \: Cu (OH)2} \\ = 1.75428 \times 10 ^{ - 5}$

<h3>Solubility of Cu (OH)2 = 1.75428 × 10 -⁵ g/ L</h3>

I hope I helped you^_^

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2 years ago

Which is NOT a control in the following experiment?: An experiment was performed to determine how the amount of coffee grounds c

Alexandra [31]

Answer:

The same kind of coffee, the same coffee maker, the same amount and type of water, and the same electrical sources were used.

Explanation:

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3 years ago

Please help :) ill mark you as the brainiest hope you have a good day

Hitman42 [59]

Have a wonderful day :) thanks for the points

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2 years ago

What are three ways of the atmosphere is important to living things?

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1. Blocks Ultra violet rays that can be harmful.
2. Provides Oxygen, so we can live.
3. It blocks meteors from hitting Earth's surface.

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2 years ago