Answer:
69% Ag, 10.5% S, 20.5% O.
Explanation:
Ag₂SO₄ → Molar mass = 311.8 g/mol
2 mol of Ag → 107.87g/m . 2m = 215.74 g
1 mol of S → 32.06g/m . 1m = 32.06 g
4 mol of O → 16g/m .4m = 64 g
Percentage composition will be:
(Mass of Ag/ Total mass) . 100
(215.74 g / 311.8 g) . 100 = 69 %
(Mass of S/ Total mass) . 100
(32.06 g / 311.8 g) .100 = 10.5%
(Mass of O/ Total mass) . 100
(64 g / 311.8 g) . 100 = 20.5 %
Answer:
Lisa sold 75 boxes of cookies all together
Explanation:
The 1st week she sold 18 boxes of cookies
The 2nd week she sold 18 of cookies
The 3rd week she sold 12 boxes of cookies
The 4th week she sold 12 boxes of cookies
The 5th week she sold 15 boxes of cookies
So, number of cookies sold altogether is 18+18+12+12+15= 75
Answer:
b option
Explanation:
H2O has a tetrahedral arrangement of molecules or an angular geometry. This is mainly because the repulsion from the lone pair combination is more than bond-pair repulsion.
Answer: Water and oil cannot mix
Explanation:
This is an redox reaction, a combustion reaction.
For example:
4Al + 3O₂ = 2Al₂O₃
Al - 3e⁻ = Al⁺³
O₂ + 4e⁻ = 2O⁻²
