Answer:
The fact of light and radio waves being deflected by passing obliquely through an interface between one medium or another.
Answer:
Renewable energy minimizes carbon pollution and has a much lower impact on our environment. And it's having its moment in the sun. "Giving more New Yorkers access to renewable energy can allow them to reduce their own energy bills while reducing stress on the grid and demand for fossil fuel power.
A.helium has no valency
B.lithium has 1
C.nitrogen has either 5 or 3 because it bonds outer orbital
D.magnesium has 2
Answer: Hence the energy change is -1918 kJ/mol
Given:
Initial temperature of calorimeter T1 = 25 C
Final temperature T2 = 29 C
Heat capacity of calorimeter c = 4.90 kJ/C
Mass of sucrose (m) = 3.5 g
Molar mass of sucrose (M) = 342.3 g/mol
To determine:
The energy change for the combustion of sucrose in kJ/mol
Explanation:
The change in temperature of calorimeter = T2 -T1 = 29 - 25 = 4 C
Heat gained by the calorimeter when the temperature changes by 4 C is-
= 4 C * 4.90 kJ/ 1 C = 19. 6 kJ
Now,
Heat gained by calorimeter = heat lost during combustion of 3.5 g sucrose = -19.6 kJ
# moles of sucrose = 3.5 g/342.3 g.mole-1 = 0.01022 moles
Energy change for the combustion reaction = -19.6/0.01022 = -1917.8 kJ/mol