Ok I'm given 38.5 mg as mass. I have to find moles and number of atoms. Am I also converting mg to g? If so please help

Yes, convert 38.5 mg to grams, then remember 1 mole of atoms contains 6.022E23 atoms.

Yes, you need to convert milligrams (mg) to grams (g) before finding the moles and number of atoms. Here's how you can do it:

1. Convert milligrams to grams:
To convert from milligrams to grams, divide the given mass (38.5 mg) by 1000 since there are 1000 milligrams in a gram:
38.5 mg ÷ 1000 = 0.0385 g

So, the mass of your substance is 0.0385 grams.

2. Find the moles:
To calculate the number of moles, you need to divide the mass by the molar mass of the substance. The molar mass is the mass of one mole of that substance and is expressed in grams/mol.

Let's say the substance you have is X. If you know the molar mass of X, divide the mass by the molar mass:
Number of moles = Mass (in grams) ÷ Molar mass (in grams/mol)

For example, if the molar mass of X is 25 g/mol:
Number of moles = 0.0385 g ÷ 25 g/mol

Make sure you have the correct molar mass for your substance before proceeding.

3. Find the number of atoms:
To find the number of atoms, you need to use Avogadro's number, which states that there are 6.022 x 10^23 atoms in one mole of any substance.

Multiply the number of moles by Avogadro's number to find the number of atoms:
Number of atoms = Number of moles x Avogadro's number

For example:
Number of atoms = Number of moles x 6.022 x 10^23

Plug in the calculated number of moles from step 2 into this equation to find the number of atoms.

Remember, the molar mass and the identity of the substance are important in these calculations, so make sure you have the correct information.