Question

How do you convert particles to moles, and mass to moles?

1) 77.56 g of CaCO3 to moles







2) 2.55 x 10^24 molecules of KCl to grams







3) 0.0931 mol of BaCl2 to grams







4) 1.55 x 10^22 molecules to moles









5) 0.664 moles of HF to molecules









6) 86 g of Fe(NO3)3 to moles











7) 7.88 x 10^23 molecules of CO2 to grams











8) 2.93 moles of MgF2 to grams











9) 7.56 g of MgCO3 to moles








10) 8.55 x 10^21 molecules of NaCl to grams

Answer 1

1. mol = 77.56/100 = 0.7756 mol

2. mol = 2.55 × 10^24/6.02 × 10^23 = 4.236 mol mass = 4.236 × 74.5 = 315.582 g

3. mass = 0.0931 × 208.3 = 19.393 g

4. mol = 1.55 × 10^22/6.02 × 10^23 = 0.0257 mol

5. molecules = 0.664 × 6.02 × 10^23 = 3.997 × 10^23 molecules

6. mol = 86/242 = 0.355 mol

7. mol = 7.88 × 10^23/6.02 × 10^23 = 1.309 mol mass = 1.309 × 44 = 57.596 g

8. mass = 7.56 × 62 = 468.72 g

9. mol = 7.56/84 = 0.09 mol

10. mol = 8.55 × 10^21/6.02 × 10^23 = 0.014 mol mass = 0.014 × 58.5 = 0.819 g

recheck to ensure all answers are correct