Answer:
a) 4869 kJ will be released
b) 43.86 g of octane
Explanation:
The heat of combustion is the amount of heat released when 1 mol of a substance reacts with enough oxygen .
Since the heat of combustion is per mol of combustible substance what we are required to do in this problem is calculate number moles in the reactions although in a different manner.
a) MW C3H6O = 158 g/mol
mol C3H6O = 158 g x 1 mol/58.08 g = 2.72
-1790 kJ/ mol x 2.72 mol = 4869 kJ
b) Here we are asked the mass of octane to produce 1950 kJ of heat knowing that per mol of octane we get 5074.1 kJ, then
1 mol / 5074.1 kJ x 1950 kJ = 0.384 mol
mass C8H18 = 0.384 mol x 114.23 g/mol = 43.86 g
Answer:
1.977 g/L
Nitrous oxide
Names
Molar mass 44.013 g/mol
Appearance colourless gas
Density 1.977 g/L (gas)
Melting point −90.86 °C (−131.55 °F; 182.29 K)
Answer:
If a solution conducts electricity, it is positive evidence that solute dissolved in solvent is electrolyte.
Answer:
Protons and neutrons which packed tightly into central core of the atom.
Explanation:
Atoms are composed of three subatomic particle; electron, proton and neutron. Electrons are negatively charged, protons are positively charged whereas neutrons are neutral, hence does not have any charge.
Out of three, protons and neutrons are present in the nucleus of the atom.
Nucleus is the central part of the atom possessing most of the mass of the atom. In the nucleus, protons and neutrons are tightly packed with the help of nuclear force.
Electrons are present around the nucleus also called electron cloud.
Therefore, nucleus are composed of protons and neutrons which packed tightly into central core of the atom
