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klasskru [66]
3 years ago
15

Correct answer. 9. The mass number of an element is the number of? ​

Chemistry
1 answer:
Elis [28]3 years ago
4 0

Answer:

The mass number is defined as the total number of protons and neutrons in an atom. The number of neutrons = mass number − atomic number.

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In the gas egquation PV=RT, V stands for volume of
Wittaler [7]

Ans: B . 1 mole of gas

Explanation:

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3 years ago
How many moles of calcium oxide are formed when 3 moles of calcium react with oxygen?
Temka [501]

Answer:

3 moles of CaO

Explanation:

The chemical balanced equation is;

2Ca + O₂ → 2CaO

The ratio of calcium(Ca) to Calcium Oxide(Cao) in this equation is 2:2.

Now, when 3 moles of calcium react with oxygen, Cao produced will be;

3 moles of O₂ × 2 moles of CaO/2 moles of Cao = 3 moles of CaO

7 0
3 years ago
The energy released per gram of material is __________.
OLga [1]

Answer:

I'm pretty sure the answer is C.

4 0
2 years ago
What is the equation you use to determine the momentum of an object
klemol [59]

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5 0
3 years ago
When aqueous ammonia is added to a solution containing Bi3+ and Cu2+ cations, ____________ occurs. A. Reduction to black bismuth
MissTica

Answer:

C. Precipitation of white bismuth hydroxide.

Explanation:

When aqueous ammonia is added to a solution that has Bi3+ and CU2+ cations, what we would have as a chemical result is the precipitation of white Bismuth hydroxide.

The chemical reaction for this can be written as,

Bi3+ + 2NH3 + 3H2O ⇌ Bi(OH)3(s) + 3NH4

Thank you!

6 0
3 years ago
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