2 years ago

What percentage of the atmosphere is oxygen?

Chemistry

1 answer:

lidiya [134]2 years ago

7 0

Answer:

21%

Explanation:

It's a mixture of different gases. The air in Earth's atmosphere is made up of approximately 78 percent nitrogen and 21 percent oxygen.

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Please help me with this question it’s due in five minutes I’ll give brainliest

zysi [14]

I believe the correct answer is A) 6

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2 years ago

Which is TRUE of the products in this combustion reaction? 4Fe + 3O2 2Fe2O3

ycow [4]

The only true answer is A.

products are on the right side of the reaction

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It is the reactants that <span>are the atoms, molecules, or compounds that participate in the reaction.</span>

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3 years ago

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In the forward reaction of this equilibrium, which substance acts as the Brønsted-Lowry base? H2S(aq)+CH3NH2(aq)⇋HS−(aq)+CH3NH+3

timama [110]

H2S donates a proton, therefore it is a Brønsted-Lowry base; CH3NH2 accepts a proton, so it’s a Brønsted-Lowry base.

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3 years ago

Hydrogen gas and fluorine gas will react to form hydrogen fluoride gas. What is the standard free energy change for this reactio

Marta_Voda [28]

Answer:

$\Delta G=-541.4kJ/mol$

Explanation:

Hello there!

In this case, according to the given information, it turns out firstly necessary to write out the described chemical reaction as shown below:

$H_2+F_2\rightarrow 2HF$

Now, we set up the expression for the calculation of the standard free energy change, considering the free energy of formation of each species, specially those of H2 and F2 which are both 0 because they are pure elements:

$\Delta G=2\Delta G_f^{HF}-(\Delta G_f^{H_2}+\Delta G_f^{F_2})\\\\\Delta G=2*-270.70kJ/mol-(0kJ/mol+0kJ/mol)\\\\\Delta G=-541.4kJ/mol$

Regards!

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2 years ago

A slingshot that has been pulled back but has not been let go.

Elden [556K]

Answer: Potential energy

Explanation: i hope i wasnt toooo late

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3 years ago