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Nonamiya [84]
2 years ago
8

How many moles of O are there in 41.8 grams of O?

Chemistry
1 answer:
il63 [147K]2 years ago
8 0

Answer:

\boxed {\boxed {\sf 2.61 \ mol \ O}}

Explanation:

To convert from grams to moles, the molar mass is used. This number tells us the grams per mole of a substance. It can be found on the Periodic Table. Look for oxygen.

  • Oxygen (O): 15.999 g/mol

Use this number as a ratio.

\frac {15.999 \ g \ O }{ 1 \ mol \ O }

Multiply by the given number of moles.

41.8 \ g \ O *\frac {15.999 \ g \ O }{ 1 \ mol \ O }

Flip the fraction so the grams of oxygen cancel.

41.8 \ g \ O *\frac { 1 \ mol \ O }{ 15.999 \ g \ O}

41.8  *\frac { 1 \ mol \ O }{ 15.999 }

\frac { 41.8 \ mol \ O }{ 15.999 }= 2.61266329146 \ mol \ O

The original measurement of grams has 3 significant figures (4, 1, and 8). Our answer must have the same. For the number we calculated, that is the hundredth place. The 2 in the thousandth place tells us to leave the 1.

2.61 \ mol \ O

41.8 grams of O has 2.61 moles of oxygen.

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