Question

28.09 g of silicon contains 6.02 1023 silicon atoms. What is the mass in grams of 1.06 1025 silicon atoms?
Can you help me please.

Answer 1

You can do a ratio/proportion like this:
(g/atoms) = (g/atoms)
(28.09g/6.02E23atoms) = (x g/1.06E25 atom) and solve for x.

OR you can remember that 1 mol of atoms contains 6.02E23 atoms so how many mols do you have? That's 1.06E25/6.02E23 = ?
1 mol has a mass of 28.09 g so the mass of ? mols is xx.

Or you can do
28.09 g x (1.06E25/6.02E23) = ?g

Answer 2

Thank you Dr. Bob