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Mademuasel [1]
3 years ago
10

Round to 4 significant figures. 0.007062

Chemistry
1 answer:
lapo4ka [179]3 years ago
8 0

Answer:

Hey there!

This is already rounded to four significant figures!

Zeroes after the decimal but before the 7 don't count, and 7, 0, 6, and 2 count as significant figures.

So, the answer would be 0.007062.

Let me know if this helps :)

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Answer:

 A.    2Na       +    2H₂O   →    2NaOH   +  H₂  

Explanation:

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Reactants:

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         2Na       +    2H₂O   →    2NaOH   +  H₂  

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How many grams of ag can be formed from 5.50 grams of ag2o in the equation: 2ag2o (s) → 4ag (s) o2 (g)?
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From the given balanced equation we have find out the amount (in gm) of Ag formed from 5.50 gm of Ag₂O.

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We know, molecular mass of Ag₂O= 231.7 g/mol, and atomic mass of Ag= 107.8 g/mol. Given, mass of Ag₂O=5.50 gm. Number moles of Ag₂O=\frac{5.50}{231.7}= 0.0237 moles.

From the balanced chemical reaction we get 2 (two) moles of Ag₂O produces 4 (four) moles of Ag. So, 0.0237 moles of Ag₂O produces \frac{4X0.0237}{2} moles=0.0474 moles of Ag= 0.0474 X 107.8 g of Ag=5.11g Ag.

Therefore, 5.50 g Ag₂O produces 5.11 g of Ag as per the given balanced chemical reaction.


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