Answer:
1) <u>1.0 *10^-16 moles</u>
<u>2) 2.2 moles</u>
<u>3) 4.9 * 10^25 molecules</u>
<u>4) 2.47 *10^24 atoms</u>
<u>5) 2.2 *10^23 molecules</u>
Explanation:
How many moles of Ne contain 61,000,000 atoms?
1 mol contains 6.022 * 10^23 atoms OR 6.022 *10^23 atoms = 1 mol
6.1 * 10^7 atoms = (1/ 6.022*10^23) * 6.1 * 10^7 =<u> 1.0 *10^-16 moles</u>
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How many moles of water contain 1.3 x 10^24 molecules?
1 mol contains 6.022 * 10^23 molecules
(1/6.022*10^23)*1.3*10^24 =<u> 2.2 moles</u>
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How many molecules of SF6 are in 81 moles?
1 mol contains 6.022 *10^23 molecules
81 moles contain 81 * 6.022*10^23 = <u>4.9 * 10^25 molecules</u>
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How many atoms of carbon are present in 4.10 moles?
1 mol contains 6.022 * 10^23 molecules
4.10 moles contain 4.10 * 6.022*10^23 = <u>2.47 *10^24 atoms</u>
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How many molecules of NO2 are in 0.36 moles?
1 mol contains 6.022*10^23 molecules
0.36 moles contain 0.36 * 6.022*10^23 = <u>2.2 *10^23 molecules</u>