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Vika [28.1K]
3 years ago
14

Which of the following statements is true?

Chemistry
1 answer:
UkoKoshka [18]3 years ago
7 0
I believe A.
Calcium and potassium help with blood pressure, muscles, and bones.

For b, there is little helium in the atmosphere.
For C, the center is made of neutrons and protons, electrons are far away.
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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.

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You need the unit of g however you must convert to moles before you can use the mole ratio to find the moles of iron, you used the molar mass of iron to find the grams of iron. since F e 2 o 3 

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We also need the nitrogen intake

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