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2 years ago

4

How many moles are in a sample of 1.52 x 10^24 atoms of mercury (Hg)?

2 answers:

stepan [7]2 years ago

5 0

we know that

1 Mol is equal to -------> $6.02 * 10^{23}$ atoms (Avogadro's number)

by proportion

$\frac{1}{6.02*10^{23}}\frac{Mol}{Atoms} =\frac{x}{1.52*10^{24}} \frac{Mol}{Atoms}\\ \\x*6.02*10^{23} = 1.52*10^{24}\\ \\x=\frac{1.52*10^{24}}{6.02*10^{23}} \\ \\x=2.52\ Mol$

therefore

<u>the answer is the option</u>

2.52 mol Hg

Basile [38]2 years ago

4 0

How many moles are in a sample of 1.52 x 1024 atoms of mercury (Hg)?

1.75 mol Hg

2.52 mol Hg CORRECT ANSWER

91.5 mol Hg

50.4 mol Hg

I took the test and B) was correct.

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We have been given that Darren invests $4,500 into an account that earns 5% annual interests. We are asked to find the amount in his account after 10 years, if the interest rate is compounded annually, quarterly, monthly, or daily.

We will use compound interest formula to solve our given problem.

$A=P(1+\frac{r}{n})^{nt}$ , where,

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P = Principal amount,

r = Annual interest rate in decimal form,

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t = Time in years.

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When compounded annually, $n=1$ :

$A=4500(1+\frac{0.05}{1})^{1\cdot 10}$

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When compounded quarterly, $n=4$ :

$A=4500(1+\frac{0.05}{4})^{4\cdot 10}$

$A=4500(1.0125)^{40}$

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When compounded monthly, $n=12$ :

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When compounded daily, $n=365$ :

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2 years ago

47 lbs = ______________ kgs (give answer in decimal form)

Lyrx [107]

"lbs" (pounds) is a measure of force, whereas "kgs" (kilograms) is
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