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2 years ago

A copper atom has 29 protons and 36 neutrons. What is the mass number of this atom in amu?

Chemistry

1 answer:

Mamont248 [21]2 years ago

4 0

The Mass number is 65, Copper-65

To find the mass number you add the number of protons to the number of neutrons.

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Given: 4Na + O2 → 2Na2O In this chemical reaction, how many moles of Na2O will be produced if 2.90 moles of Na react completely?

crimeas [40]

Since we already have the balanced equation, we know that the ratio between $Na:Na_{2}O$ is $4:2$ respectively.

So then we can set up a proportion to find the number of moles produced when 2.90 moles of Na react completely:

$\frac{4mol_{Na}}{2mol_{Na_{2}O}} =\frac{2.90mol_{Na}}{xmol_{Na_{2}O}}$

Then we cross multiply and solve for x:

$4x=5.8$

$x=1.45$

Therefore, we know that when 2.90 moles of Na react completely, there are 1.45 moles of $Na_{2}O$ that are produced.

3 0

3 years ago

What is the concentration of the barium hydroxide solution if 50.0 mL of a 0.425 M HNO3 solution is required to neutralize a 36.

fomenos

The molarity of Barium Hydroxide is 0.289 M.

<u>Explanation:</u>

We have to write the balanced equation as,

Ba(OH)₂ + 2 HNO₃ → Ba(NO₃)₂ + 2 H₂O

We need 2 moles of nitric acid to react with a mole of Barium hydroxide, so we can write the law of volumetric analysis as,

V1M1 = 2 V2M2

Here V1 and M1 are the volume and molarity of nitric acid

V2 and M2 are the volume and molarity of Barium hydroxide.

So the molarity of Ba(OH)₂, can be found as,

$$ M2 = \frac{V1 \times M1}{2 \times V2}$

$$M2 = \frac{50 \times 0.425 }{2 \times 36.8}$

= 0.289 M

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3 years ago

What is the Scientific<br> Method?

Doss [256]

Answer:

I just finished a unit on Scientific Method in my science class! Anyway, it's defined in the screenshots below. Hope this helps!

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3 years ago

Two students were conducting an experiment. They have two blocks of different metals and wanted to identify them. They started b

erik [133]

Answer:

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3 years ago

the atomic number is the number of protons, but in a neutral atom it is also the number of _____. A. none of these B. electrons

aksik [14]

Answer:

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3 years ago

A copper atom has 29 protons and 36 neutrons. What is the mass number of this atom in amu?​

A copper atom has 29 protons and 36 neutrons. What is the mass number of this atom in amu?