1.3 x 10^21 atoms Na is 4.63230769231 mol Na
4.63230769231 mol Na * 23g/mol Na = 106.543076923g
Answers:
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1) [D]: " CO₂ " .
<u>Note:</u><u> </u> This is the only answer choice given that is composed of: "at least two different elements" .
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2) [D]: "carbon and hydrogen" {"C" and "H" .} .
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The value of the given expression up to correct significant figures is
.
- The rule that applies for the multiplication and division is :
The least number of significant figures in any number of the problem determines the number of significant figures in the answer.
- The rule that applies for the addition and subtraction is :
The least precise number present after the decimal point determines the number of significant figures in the answer.
Given:
The expression: (23.4m)(14m)
To find:
The answer up to correct a number of significant figures.
Solution
Number of significant figures in '23.4' = 3
Number of significant figures in '14' = 22

The number with the least significant figures is '14' is 2, so the answer will be reported up to 2 significant figures:

Number of significant figures in '330' = 3
The value of the given expression up to correct significant figures is
.
Learn more about significant figures here:
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Answer:
Gravity!
Explanation:
She kicked it up. The ball comes back due to gravity.
Nice riddle!
Have a great day!!