Answer:
Vanderwaals forces
Explanation:
CBr4 is a nonpolar molecule, nonpolar molecules usually possess vanderwaals forces between their molecules as their main attractive force.
CBr4 is nonpolar because the tetrahedral arrangement of the C-Br bonds cancel out the individual dipole moments of each C-Br bond thereby making the compound nonpolar, hence the answer above.
The answer has to depend on the mass of the copper that you're trying to melt.
But there is a formula which you can calculate the energy required if you have the information of the mass. This formula requires the value called specific latent heat of fusion, which is the energy required to melt or freeze a specific mass of copper without changing its temperature but change its state.
E is the total energy required, m is the mass, and lv is the specific latent heat of fusion of copper.
Usually, in questions, lv is given. But we can also look it up online which is around 205kJ kg^-1
this means, to melt or freeze a copper, we need to work the mass multiplied by 205kJ in order to calculate its total energy needed or released.
Answer:
2 mole
Explanation:
Hydrogen has 2 atoms per molecule
Sulphur is found in 23 isotopes ranging from 27 to 49.
Also, magnitude of average atomic mass is more toward the isotope which is the most abundant.
Now , molecular mass of Sulphur is 32.06 u . It means the most abundant isotopes of Sulphur is 32.
It can also be verified by the fact that 95 % of natural occurring sulfur is .
Hence, this is the required solution.