Helpp plzz i need answers

Question

1. 1.29 x 10^24 atoms of HF to grams

2. 3.14g of H2O to molecules

3. 2.79g NH3 to atoms

4. 4.90 mol Al2O3 to grams. To atoms

5. 3.56g of Cu to atoms

6. Mass of a sample of NO2 with 1.54 x 10^24 atoms.

Answer 1

1). You can't have atoms of HF because HF is a compound, so you can have molecules of HF but not atoms.

2). 3.14 g H2O x 1 mol H2O/18 g x 6.02x10²³ molecules/mol = 1.05x10²³ molecules H2O

3.) 2.79 g NH3 x 1 mol NH3/17 g x 6.02x10²³ molecules/mol x 4 atoms/molecule = 3.95x10²³ atoms

You should try the rest yourself. If problems, submit again.