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horrorfan [7]
3 years ago
7

Calculate with the correct number of significant figures 2.0 x 10^5 x 3.00 x 10^8

Chemistry
1 answer:
xxMikexx [17]3 years ago
3 0

Answer:

the correct answer is 17 significant figures

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Balance these equations:
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68.3 grams of sodium hydroxide reacts with 78.3 grams of magnesium nitrate. ____ grams of magnesium hydroxide will form from thi
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Answer:

30.8 grams of magnesium hydroxide will form from this reaction, and magnesium nitrate is the limiting reagent.

Explanation:

The reaction that takes place is:

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Now we <u>convert the given masses of reactants to moles</u>, using their respective <em>molar masses</em>:

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0.528 moles of Mg(NO₃)₂ would react completely with (0.528 * 2) 1.056 moles of NaOH. There are more than enough NaOH moles, so NaOH is the reagent in excess and <em>Mg(NO₃)₂ is the limiting reagent.</em>

Now we <u>calculate how many Mg(OH)₂ are produced</u>, using the <em>moles of the limiting reagent</em>:

  • 0.528 mol Mg(NO₃)₂ * \frac{1molMg(OH)_2}{1molMg(NO_3)_2} = 0.528 mol Mg(OH)₂

Finally we convert Mg(OH)₂ moles to grams:

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