The enthalpy of vaporization of H2O is higher than the enthalpy of fusion of H2O, therefore vaporizing the same mass of H2O would require more heat/energy than melting the same mass of H2O.
Substituting a hydrogen atom with a halogen in a hydrocarbon:
- the single bond remains single. A is wrong.
- the bond with Hydrogen is as strong as with a Halogen. C is wrong
- a hydrocarbon is saturated if there is no double bond. We do not know that so D is wrong.
- carbon will always have four valence electrons. E is wrong.
By elimination, the correct answer is B. The boiling point of the new compound increases.
Mass percentage is defined as the ratio of mass of the element to the total mass of the compound.
The formula of mass percentage is given by:
Mass percentage = (1)
mass of nitrogen = 56.00 grams
Let x be the total mass of the compound.
Put the given values in formula (1):
x=
x= 151.92 g
total mass of the compound = 151.92 g
To calculate the mass of oxygen in grams, subtract the mass of nitrogen from the total mass of the compound.
Mass of oxygen = 151.92 g - 56 .00 g = 95.92 g
Thus, mass of oxygen in grams = 95.92 grams.
What are the options? I can try to give you an answer if options are provided.
For all of Carbon's valencies to be satisfied:
H₂C = C = CH₂
Thus, the answer is:
B) Two