Is this a multiple choice?
CH4+2O2–> CO2+2H2O
-count the number of atoms of each element on each side of the reaction arrow, there is 1 carbon,4 hydrogen, and 2 oxygen on the reactant side and 1 carbon, 2 hydrogen, and 3 oxygen on the product side.Then add coefficients so the number of atoms of each element is the same on both sides of the equation
Answer:
45200J
Explanation:
Given parameters:
Heat of vaporization of water = 2260J/g
Mass of steam = 20g
Temperature = 100°C
Unknown:
Energy released during the condensation = ?
Solution:
This change is a phase change and there is no change in temperature
To find the amount of heat released;
H = mL
m is the mass
L is the latent heat of vaporization
Insert the parameters and solve;
H = 20g x 2260J/g
H = 45200J
The answer is (4). The same magnitude and the opposite sign. For a proton, it has one positive electric charge. And for electron, it has one negative electric charge. So they have same magnitude but opposite sign.
