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11111nata11111 [884]
3 years ago
6

What is the most abundant gas in Earth's present day atmosphere?

Chemistry
2 answers:
hodyreva [135]3 years ago
8 0

The answer is nitrogen

Anna007 [38]3 years ago
4 0
Nitrogen. air consists 78% of nitrogen gas
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Multiply the following and express your answer in appropriate scientific notation, and a correct number of significant figures.
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2

Explanation:

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How many grams of kbr must be dissolved to make 25.0 ml of a solution that has a molarity of 0.85 m?
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Molarity is defined as the number of moles of solute in 1 L of solution 
molarity of solution to be prepared is 0.85 M
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If 1,000 mL = 1 L, which of the following are possible conversion factors for liters and milliliters? Check all that apply.
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Answer:

Two conversion factors:

         1=\dfrac{1L}{1,000ml}\\ \\ \\ 1=\dfrac{1,000mL}{1L}

Explanation:

You can create two possible <em>conversion factors</em>, one to convert from mL to L, and one to convert from L to mL

<u />

<u>a) From mL to L</u>

To convert mL to L you need to multiply by a conversion factor that has mL on the denominator and L in the numerator.

Your starting point is: 1,000mL=1L

Then, divide both sides by 1,000mL (this will be on the denominator of the fraction);

       1,000mL=1L\\\\ \\\dfrac{1,000ml}{1,000mL}=\dfrac{1L}{1,000mL}\\ \\ \\ 1=\dfrac{1L}{1,000mL}

<u>b) From L to mL</u>

Divide both sides by 1 L:

            1,000mL=1L\\\\ \\\dfrac{1,000ml}{1L}=\dfrac{1L}{1L}\\ \\ \\ 1=\dfrac{1,000mL}{1L}

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