converts these plz help

Question

1. How many molecules in a sample of NaClO with a mass of 3.90g.

2. 2.4g of CO2 would have how many Oxygen atoms.

3. 1.63 x 10^22 molecules of CH3COONa to grams

4. 3.6g AlPO4 to moles

5. 2.4g Na2SO4 to molecules

6. 5.50 x 10^22 atoms CaSO4 to grams

7. 6.8g (NH4)3PO4 to moles

Answer 1

No. of mole, n = mass of substance / Molar mass = m/M.

Each mole contains Avogadro's No. , Na of molecules.

1st. m = 3.9 g, M = 22.99 + 35.45+16.00 = 74.44 g/mol.

now find n, and each moles has a Na number of molecules.

Therefore, # molecules = n Na.

2nd. m = 2.4 g, M = 12.01+(16.00*2) = 44.01 g/mol

Find n now. Each molecules has Na number of molecules.

Therefore # molecules = nNa.

again each molecule has 2 O atom.

Therefore, # O atom = 2 * n * Na

3rd. Na = 6.02 *10^23 entities.

So 6.02 *10^23 molecules of CH3COONa = M = 82.03 g.

x molecules has M/x g.

Use similar concept to solve rest of your problems.

Answer 2

NaCLO has a molar mass of:

Na: 22.990 x 1 = 22.990

Cl: 35.453 x 1 = 35.453

O: 15.999 x 1 = 15.999

Total: 22.990 + 35.453 + 15.999 = 74.442 g/mol

3.9 grams of NaClO = 3.9/74.442 = 0.05239 moles

Every mole has 6.022 x 10²³ molecules in it so there are (0.05239)(6.022 x 10²³) = 3.15 x 10²² molecules.

The other problems are all similar.