how to find the mass of the substance if the only given is the molar mass???

You might try posting the entire problem. You may have missed something important.

the problem is in a table format,

then the first substance is Zn..
I need to compute for mass, molar mass, # of moles, # of molecules and #of atoms
I know the molar mass. but the rest i don't know how to do because there's no other given.

You must know SOMETHING else to compute those other items in the table OR have instructions to use to complete the table.

To find the mass of a substance given its molar mass, you can use the relationship between molar mass, moles, and mass. The molar mass of a substance is the mass of one mole of that substance, expressed in grams per mole (g/mol).

Here's the step-by-step process:

1. Start by identifying the molar mass of the substance. You can find this value on the periodic table or by calculating it based on the atomic masses of its constituent elements.

2. Once you have the molar mass, convert it to grams. This step is necessary because the molar mass is given in grams per mole. For example, if the molar mass is 32 g/mol, the mass of one mole of the substance is 32 grams.

3. Determine the quantity of the substance, either in moles or in grams. If you are given the molar mass but not either the moles or grams, then you will need additional information to solve the problem.

4. If you have the quantity in moles, use the formula:

Mass (in grams) = Molar mass (g/mol) x Number of moles

For example, if you have 2 moles of the substance and the molar mass is 32 g/mol, the mass would be:

Mass = 32 g/mol x 2 moles = 64 grams

5. If you have the quantity in grams, use the formula:

Number of moles = Mass (in grams) / Molar mass (g/mol)

For example, if you have 45 grams of the substance and the molar mass is 32 g/mol, the number of moles would be:

Moles = 45 g / 32 g/mol = 1.40625 moles

Remember, in order to accurately calculate the mass of a substance, you need either the quantity in moles or in grams, along with its molar mass.