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3 years ago

0:00 一 what is 18,000 divided by 450,000 in scientific notation

Chemistry

1 answer:

ankoles [38]3 years ago

3 0

Answer:

4 × 10-2

(scientific notation)

= 4e-2

(scientific e notation)

= 40 × 10-3

(engineering notation)

(thousandth; prefix milli- (m))

Explanation:

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calculate the mass of 120cc nitrogen present at STP. how many number of molecules are present in it?

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$0.15008\ \text{g}$

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Explanation:

1 mol of nitrogen at STP = 22.4 L = 22400 cc

n = Mol of $N_2$ = $\dfrac{120}{22400}=0.00536\ \text{mol}$

M = Molar mass of $N_2$ = $28\ \text{g/mol}$

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Mass of the nitrogen is $0.15008\ \text{g}$

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The number of molecules present in it are $3.23\times 10^{21}$

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