how do i find... howmany moles are in a specified mass
mols = grams/molar mass
To find the number of moles in a specified mass, you can use the formula:
moles = mass/ molar mass
Here's the step-by-step process to find the number of moles:
1. Identify the mass of the substance for which you want to find the number of moles. Make sure the mass is in grams.
2. Determine the molar mass of the substance. The molar mass is the mass of one mole of the substance and is expressed in grams/mole. You can usually find the molar mass on the periodic table of elements.
3. Divide the mass (in grams) by the molar mass (in grams/mole). This will give you the number of moles.
For example, let's say you want to find the number of moles in 50 grams of carbon dioxide (CO2).
1. The mass is 50 grams.
2. The molar mass of carbon dioxide (CO2) is the sum of the atomic masses of carbon (C) and two oxygen (O) atoms. The atomic mass of carbon is 12.01 grams/mole, and the atomic mass of oxygen is 16.00 grams/mole. Adding them together, the molar mass of CO2 is 12.01 + 16.00 + 16.00 = 44.01 grams/mole.
3. Divide the mass (50 grams) by the molar mass (44.01 grams/mole) to get the number of moles:
moles = 50 g / 44.01 g/mol = 1.136 moles
Therefore, there are approximately 1.136 moles in 50 grams of carbon dioxide.