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

Use this number as a ratio.

Multiply by the given number of moles.

Flip the fraction so the grams of oxygen cancel.

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.

41.8 grams of O has 2.61 moles of oxygen.

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