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jasenka [17]
3 years ago
8

Helium is the___

Chemistry
1 answer:
s344n2d4d5 [400]3 years ago
7 0

Answer:

the answer is B-2nd; stars

Explanation:

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Draw the most reasonable lewis structure of a molecule that contains a n atom, a c atom, and a h atom. include any formal charge
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H:C:::N: (hydrogen cyanide). All atoms have formal charge of 0.
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A colloid can be detected by using the _________ effect. mohs tyndall faraday brownian
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Which of the following is true about subatomic particles?
galben [10]

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d

Explanation:

neutrons and protons have the mass nearly 1.67*10-24 g

but neutrons have no charge.. protons are positively charged

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3 years ago
tres pensamientos negativos sobre el C0Vid-19 que se vive en la actualidad y luego transformemos a pensamientos positivos.
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Bueno,

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How many moles of H2 can be made from complete reaction of 3.0 moles of Al?
tresset_1 [31]

Answer: 4.5 moles of H_{2} can be made from complete reaction of 3.0 moles of Al.

Explanation:

The given reaction equation is as follows.

2Al + 6HCl \rightarrow 2AlCl_{3} + 3H_{2}

This shows that 2 moles of Al reacts with 6 moles of HCl. So, the amount of HCl required to react with 1 mole Al is three times the amount of HCl.

Therefore, 3 moles of Al will react with 9 moles of HCl to give 3 moles of AlCl_{3} and \frac{9}{2} moles of H_{2}.

The reaction equation now will be as follows.

3Al + 9HCl \rightarrow 3AlCl_{3} + \frac{9}{2}H_{2}

The moles \frac{9}{2} can also be written as 4.5 moles.

Thus, we can conclude that 4.5 moles of H_{2} can be made from complete reaction of 3.0 moles of Al.

6 0
3 years ago
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