3 years ago

What is the symbol for the second most common element in the universe?

Chemistry

2 answers:

DochEvi [55]3 years ago

5 0

The Answer is D. He if you notice it says the second not the first.

insens350 [35]3 years ago

3 0

I guess it is A and i think i m correct

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Which of the following is the correct formula for sodium oxide? NaO2 NaO Na2O3 Na3O4 Na2O

olga nikolaevna [1]

Since Na has a 1+ charge and O has a -2 charge, by reversing the charges and placing them as subscripts for the other atoms the formula is Na2O1 or simply Na2O.

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PolarNik [594]

I think its A.
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If you have 10,000 grams of a substance that decays with a half-life of 14 days, then how much will you have after 56 days?

Crank

Answer: 625 grams

Explanation:

14 goes into 56, 4 times.

10,000÷2=5,000 - first half life

5,000÷2=2,500 - second half life

2,500÷2=1,250 - 3rd half life

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3 years ago

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What is the temperature (in K) of 16.45 moles of methane gas in a 4.95 L container at 4.68 atm?

AlexFokin [52]

Using the ideal gas law: PV=nRT
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(4.68)*(4.95)=(16.45)*(0.0821)*T
Solve for T.
T=17.15

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3 years ago