Answer:
The correct answer is option E.
Explanation:
Mass of ferric oxide decomposed = 57.0 g
Moles of ferric oxide decomposed = 
According to reaction, 2 moles ferric oxide on combustion gives 824.2 kJ of heat.
Then heat given by on decomposition of 0.35625 mol of ferric oxide will be:
So, on decomposition of 57.0 grams of ferric oxide 147 kilo Joules of heat was released.
A controlled variable is essentially what is kept the same throughout the whole experiment.
Answer:
77%
Explanation:
First we <u>convert 3.0 g of cyclohexanol (C₆H₁₂O) to moles</u>, using its <em>molar mass</em>:
- Molar mass of C₆H₁₂O = 100.158 g/mol
- 3.0 g ÷ 100.158 g/mol = 0.030 mol
Then we <u>convert 1.9 g of cyclohexene (C₆H₁₀) to moles</u>, using its <em>molar mass</em>:
- Molar mass of C₆H₁₀ = 82.143 g/mol
- 1.9 g ÷ 82.143 g/mol = 0.023 mol
Finally we <u>calculate the theoretical yield</u>:
- 0.023 mol / 0.030 mol * 100% = 77%
