How many moles is 118 grams of Argon

Explanation:

To convert from grams to moles we must use the molar mass, which is found on the Periodic Table.

Use the molar mass as a ratio.

Multiply by the given number of grams: 118

Flip the fraction so the grams of argon will cancel each other out.

The original measurement of grams had 3 significant figures, so our answer must have 3 sig figs.

For the number we calculated, that is the hundredth place. The 7 in the thousandth place tells us to round the 5 to a 6.

There are about 2.96 moles of Argon in 118 grams.

pure substance: iron,copper

impure substance: water,charcoal