Answer:
1. 4.57x10²³ atoms ; 2. 0.093 moles; 3. 4.5 grams ; 4. 0.434 moles , 5. 0.5 mol of Cl₂ ; 6. N₂O
Explanation:
1. 1 mol has NA atoms
0.76 mol will have (0.76 . 6.02x10²³) = 4.57x10²³ atoms
2. 6.02x10²³ particles are contained in 1 mol
5.6x10²² particles are contained in (5.6x10²² . 1) / 6.02x10²³ = 0.093 moles
3. 1 mol of water weighs 18 g
0.25 mol . 18g/m = 4.5 grams
4. Molar mass of CaCl₂ = 110.98 g/m
Mol = Mass / molar mass → 48.2 g / 110.98 g/m = 0.434 moles
5. If the volume of Cl₂ at STP (<u>as 1 mol of any gas</u>) is 22.4L, and now we have the half of volume, we will have the half of moles, though. So, we have in the container 0.5 mol of Cl₂
6. 25.9% N and 74.1% O means that in 100 g of compound, we have 25.9 g of N and 74.1 g of O.
25.9 g of N / 14 g/m = 1.85 mol
74.1 g of O / 16 g/m = 4.63 mol
We divide the mol with the lowest value
4.63 mol / 1.85 mol = 2.5
1.85 mol / 1.85 mol = 1
N₂O