Answer:
1. 17.4 moles.
2. 1.13 moles
3. 315.5 moles
4. 390.6g
5. 1.13x10⁶ moles
6. 14.8 moles
7. 337 moles
8. 2.15x10²⁴ molecules
9. 3.13x10²⁴ atoms
10. 1.38x10²⁴ particles
11. 1517g
12. 455g of CaF₂
Explanation:
We can convert formula units to moles or vice versa using Avogadro's number and moles to grams using molar mass of the substance:
1. Molar mass NH3: 17.031g/mol
297g * (1mol / 17.031g) = 17.4 moles
2. Molar mass MgCO3: 84.3g/mol
95g * (1mol / 84.3g) = 1.13 moles
3. Using Avogadro's number (6.022x10²³ formula units / mol):
1.9x10²⁶FU * (1mol / 6.022x10²³FU) = 315.5 moles
4. Molar mass H2O: 18g/mol
21.7mol * (18g / mol) = 390.6g
5. Using Avogadro's number (6.022x10²³ molecules / mol):
6.78x10²⁹molecules * (1mol / 6.022x10²³FU) = 1.13x10⁶ moles
6. 8.9x10²⁴FU * (1mol / 6.022x10²³FU) = 14.8 moles
7. Using Avogadro's number (6.022x10²³ atoms / mol):
2.03x10²⁶atoms* (1mol / 6.022x10²³FU) = 337 moles
8. 3.569mol * (6.022x10²³ molecules / 1mol) = 2.15x10²⁴ molecules
9. 5.2mol * (6.022x10²³ atoms / 1mol) = 3.13x10²⁴ atoms
10. Molar mass Li₂SO₄: 109.94g/mol:
36g * (1mol / 109.94g) * (6.022x10²³ molecules / 1mol) * (7 particles / 1molecule) = 1.38x10²⁴ particles
<em>Assuming particles are atoms and in 1 molecule of Li₂SO₄ you have 7 atoms.</em>
11. Molar mass Cl₂: 70.9g/mol:
21.4mol * (70.9g / mol) = 1517g
12. Molar mass CaF₂: 78.07g/mol:
3.51x10²⁴FU * (1mol / 6.022x10²³FU) * (78.07g / mol) = 455g of CaF₂
