3 years ago

Almost 99% of earths atmosphere is made up of two gases. What are the two gases and the percents of each?

Chemistry

2 answers:

timofeeve [1]3 years ago

7 0

The correct answer id A i just did the test

Natali5045456 [20]3 years ago

5 0

The Answer Is A 21% oxygen and 78%nitrogen

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Answer:

im pretty sure it is D

Explanation:

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2 years ago

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Dafna11 [192]

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2 years ago

A 34.57 mL sample of an unknown phosphoric acid solution is titrated with a 0.127 M sodium hydroxide solution. The equivalence p

Bas_tet [7]

<u>Answer:</u> The concentration of unknown phosphoric acid solution is 0.034 M

<u>Explanation:</u>

To calculate the concentration of acid, we use the equation given by neutralization reaction:

$n_1M_1V_1=n_2M_2V_2$

where,

$n_1,M_1\text{ and }V_1$ are the n-factor, molarity and volume of acid which is $H_3PO_4$

$n_2,M_2\text{ and }V_2$ are the n-factor, molarity and volume of base which is NaOH.

We are given:

$n_1=3\\M_1=?M\\V_1=34.57mL\\n_2=1\\M_2=0.127M\\V_2=28.2mL$

Putting values in above equation, we get:

$3\times M_1\times 34.57=1\times 0.127\times 28.2\\\\M_1=\frac{1\times 0.127\times 28.2}{3\times 34.57}=0.034M$

Hence, the concentration of unknown phosphoric acid solution is 0.034 M

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2 years ago

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eimsori [14]

Answer:

yellow vetch

Explanation:

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3 years ago

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kodGreya [7K]

Answer:

8. littoral I hope it helps

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Read 2 more answers