How many moles are in 19.58 g?

Answer 1

To convert moles into grams, you need to first know the Molar Mass.

The Molar Mass can be defined as the (mass in grams of the substance)/(1 mole of the substance)

If you have 19.58 g of something, you need to use stoichiometry or dimensional analysis to convert it into moles.

Examples:

( 19.580 g H2O ) * ( 1 mole H2O / 18.016 g H2O ) = 1.0868 mole H2O

What I did is I took the grams given of H2O (for ex.) and multiplied it by the Molar Mass. The Molar Mass of water is 18.016 g for every mole of water. However, since I wanted to cancel out the units, I put the grams of H2O on the bottom. So basically its like multiply a number with a value that equals 1 to convert something.

Logical example:

Given: Find the number of ounces in 1 pound.

( 19.580 lb.) * (16.000 oz. / 1.0000 lb. ) = 313.28 oz

Get it?

Answer 2

To find the number of moles, first determine the molar mass of the substance. Let's use the molar mass of water (H2O) as an example: 1 mole of water = 18.015 g. Then, divide the given mass by the molar mass to get the number of moles. So, for 19.58 g of water, the number of moles would be 19.58 g / 18.015 g/mol = 1.09 moles.

Answer 3

The value is different for each compound.