A mixture of Cu2 and CuO of mass 8.828g is reduced to copper metal with hydrogen: Cu2O + H2 --> 2Cu + H2O CuO + H2 --> Cu + H2O
If the mass of pure copper isolated was 7.214g, determine the percent by mass of CuO in the original sample
Let x = grams of CuO in the original sample. y = grams of Cu2O in the original sample.
Eq. #1 x + y = 8.828 grams
Molar mass of CuO = 63.5 + 16 = 79.5 grams Moles of CuO = x ÷ 79.5
Molar mass of Cu2O = 63.546 + 32 = 95.5 grams Moles of Cu2O = y ÷ 95.5
According to the 2nd balanced equation, CuO + H2 --> Cu + H2O , 1 mole of CuO produces 1 mole of Cu. So, x ÷ 79.5 moles of CuO will produce x ÷ 79.5 moles of Cu
According to the 1st balanced equation, Cu2O + H2 --> 2Cu + H2O, 1 mole of Cu2O produces 2 moles of Cu So, (y ÷ 95.5) moles of Cu2O will produce 2 * (y ÷ 95.5) moles of Cu
Since, the mass of pure copper isolated was 7.214 grams Moles of Cu = (7.214 ÷ 63.5)
Moles of Cu from Cu2O + moles of Cu from CuO = total moles of Cu!!
2 * (y ÷ 95.5) + (x ÷ 79.5) = (7.214 ÷ 63.5) Multiply by both sides by 95.5 * 79.5 * 63.5 to get rid of denominators
(2 * 79.5 * 63.5) y + (95.5 * 63.5) x = (7.214 * 95.5 * 79.5)
10,096.5 y + 6,064.25 x = 36,418.0755 Divide both sides by 6,064.25 x + 1.665 y = 6
Eq.#2 x = 6 – 1.665 y Eq. #1 x + y = 8.828 x = 8.828 – y
8.828 – y = 6 – 1.665 y 0.665 y = 2.828 y = 4.25 grams of Cu2O x = 8.828 – 4.25 = 4.58 grams of CuO
The structure of Dimethyl sulfide is H3C-S-CH3. It is produced naturally by some marine algae.
<u>Explanation:</u>
DMS or dimethyl sulfide is formed by using two methyl groups combined with one sulfur atom. It is an organosulphur compound with a structural formula H3C-S-CH3.
Most abundant biological sulfur compounds emitted to air and oceans by phytoplankton.
DMS is produced naturally by the waste of dimethyl sulphoxide which is disposed into the sewer causing environmental odor problems.
It is a flammable liquid that boils at 37 degrees celsius and a disagreeable smell produced from the cooking of certain vegetables also indicates bacterial contamination in the production of malt and brewing.
Heterogeneous-a mixture of two or more things solution-a substance that dissolves suspension-mixture where solid particles do not dissolve colloid-does not settle and cannot be seperated
Heterogeneous - tuna casserole -chocolate chip cookies -gelatin dessert -green salad Solution -oil (?) depends Suspension -vinegar salad dressing -oil (?) it could go in either catagory Colloid -vinegar salad dressing -oil (?)
