Answer: 672.2 grams
Explanation:
With 564.1 kJ of heat energy, 
moles of ethanol can be combusted.
So, we need to find the formula mass of ethanol.
- The atomic mass of carbon is 12 g/mol.
- The atomic mass of oxygen is 16 g/mol.
- The atomic mass of hydrogen is 1 g/mol.
- So, the formula mass of ethanol is
g/mol.
Therefore, the mass of ethanol is 
grams.
The answer is (2). The electrolytic cell mechanism is to convert the electrical energy to chemical energy. So it need external energy source. And there is a similar one called voltaic cell which will convert the chemical energy to electrical energy.
The correct answer is e. 3.57×10³
Al³+(aq) + 3e→AL(s)
4.00g of AL=4g/26.98 g/mol= 0.1483 mol
t=znF/1 where t is time in seceonds.
Z= valency number of ions of the substance or electrons which are transferred per ion
F= Faraday's constant
I = electric current in'A'CA C/s
t=(3×0.1483 mol ×96485 C/mol) /12(C15)
t=3577 second = 3.5 ×10³s
3.011 X 10-22 sulfur atoms
