Answer:
The answer to your question is below
Explanation:
Data
Mass of SO₂ = 75 g
Atoms of HCl = ?
Write the balanced reaction
SO₂ + Cl₂ + 2H₂O ⇒ H₂SO₄ + 2HCl
Process
1.- Calculate the molecular mass of SO₂ and HCl
Molecular mass SO₂ = 32 + (16 x 2) = 64
Molecular mass of HCl = 36.5
2.- Calculate the mass of HCl formed
64 g of SO₂ ----------------- 2(36.5) g of HCl
75 g of SO₂ ---------------- x
x = (75 x (2 x 36.5)) / 64
x = 5475/64
x = 85.54 g of HCl
3.- Calculate the number of atoms of HCl
36.5 g of HCl -------------------- 6.023 x 10²³ atoms
85.54 g of HCl ----------------- x
x = (85.54 x 6.023 x 10²³) / 36.5
x = 1.41 x 10²⁴ atoms
12.-
a) Calculate the molecular mass of H₂SO₄
Molecular mass = (2 x 1) + (32 x 1) + (16 x 4) = 98 g
64 g of SO₂ -------------------- 98 g of H₂SO₄
75 g of SO₂ -------------------- x
x = (75 x 98) / 64
x = 114.8 g of H₂SO₄
98 g of H₂SO₄ ------------------- 6.023 x 10²³ atoms
114.8 g of H₂SO₄ ------------------- x
x = (114.8 x 6.023 x 10²³) / 98
x = 7.06 x 10²³ atoms of H₂SO₄
13.-
2NaNO₃ + CaCO₃ ⇒ Na₂CO₃ + Ca(NO₃)₂
Process
1.- Calculate the molecular mass of CaCO₃
CaCO₃ = (40 x 1) + (1 x 12) + (16 x3) = 100 g
2.- Convert 7 g of CaCO₃ to moles
100 g ------------------- 1 mol
7 g -------------------- x
x = (7 x 1) / 100
x = 0.07 moles
3.- Calculate the moles of NaNO₃
2 moles of NaNO₃ ------------- 1 mol of CaCO₃
x --------------- 0.07 moles
x = (0.07 x 2)/1
x = 0.14 moles of NaNO₃
