Question

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We will
(05.01 MC)
What is the mass of 0.80 moles of Mg? (1 point)
a.0 7.5 x 1023 grams
b.4.8 x 1023 grams
c.30 grams
d.19 grams

Answer 1

D.) 19 grams

Step-by-step explanation:

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Answer 2

Answer: The answer is: [D]: " 19 grams " .

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Step-by-step 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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