Answer: The answer is: [D]: " 19 grams " .
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Explanation:
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Given: 0.80 moles of Mg ;
Convert to "g" (units of "g" ; that is "grams" of "Mg" ).
Using The Period Table of Elements, the molar mass of "Mg" is:
24.305 g / mol
0.80 mol * (24.305 g Mg / 1 mol Mg) = ? g Mg ?? ;
The units of "mol" cancel out; since: " mol/ mol = 1" ;
and we have: (0.80 * 24.305) g Mg ;
= 19.444 ;
→ Round this number to 2 (two) significant figures; since there are 2 (two) significant figure in our given amount of Mg — " 0.80 mol" ;
→ 19 g ; which is our answer.
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Hope this helps!
Best wishes to you!
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Answer:
D.) 19 grams
Explanation:
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