Hydrogen peroxide is H2O2, while water is H2O and oxygen (a diatomic gas) is O2. The (unbalanced) reaction is:
H2O2 --> H2O + O2
Notice that the H2O2 has 2 H atoms, and so does H2. This means that both must have the same coefficients, and we can adjust the coefficient of O2. Since H2O2 has 2 O atoms, and H2O has 1, we multiply O2 by 1/2:
H2O2 --> H2O + (1/2)O2
This has an equivalent number of H and O atoms on either side, but we want the coefficients to be whole numbers, so we multiply everything by 2:
2H2O2 --> 2H2O + O2
Answer: 39 electrons
Explanation: Subtract 79 by 40 to get the atomic number (amount of protons) which is 39. The number of electrons must be the same as the number of protons if it's not an ionic compound so the amount of electrons is the same amount of protons.
Answer:
56.69905
Explanation:
The conversion factor from pounds to kilograms is 0.45359237, which means that 1 pound is equal to 0.45359237 kilograms.
Explanation:
(a) Dry ice is solid carbon dioxide and its chemical formula is solid 
.
(b) Sodium chloride is commonly known as salt in daily life. Hence, chemical formula of salt is NaCl.
(c) Laughing gas is also known as dinitrogen monoxide. Hence, its chemical formula is 
.
(d) Marble (chalk limestone) is chemically known as calcium carbonate. Hence, its chemical formula is 
.
(e) Baking soda is chemically known as sodium bicarbonate. Hence, its chemical formula is 
.
(f) Ammonia has a chemical formula as 
.
(g) Water has a chemical formula as 
.
(h) Milk of magnesia is a base and it is chemically known as magnesium hydroxide. Its chemical formula is 
.
(i) Epsom salt is most often found as heptahydrate of sulfate mineral epsomite. Its chemical formula is usually 
. If not present as a heptahydrate then its chemical formula is 
where, value of x can be equal to 0 to 7.
Answer:
A. Theoretical yield = 3.51g
B. %yield = 75%
Explanation:
The balanced equation for the reaction is given below:
C2H4 + 3O2 —> 2CO2 + 2H2O
Molar Mass of O2 = 16 x 2 = 32g/mol
Mass of O2 from the balanced equation = 3 x 32 = 96
Molar Mass of H20 = (2x1) + 16 = 18g/mol
Mass of H2O from the balanced equation = 2 x 18 = 36g
A. From the equation,
96g of O2 produced 36g of H2O
Therefore, 9.35g of O2 will produce = (9.35 x 36)/96 = 3.51g of H2O
Therefore,theoretical yield of water (H2O) = 3.51g
B. Theoretical yield = 3.51
Actual yield = 2.63g
%yield =?
%yield = Actual yield/Theoretical yield x 100
%yield = 2.63/3.51
%yield = 75%
