Answer:
pH = 6.964 which rounds to 7.0 if 2 sig figs
Explanation:
Ka₁ * Ka₂ = x
2.4x10⁻⁴ * 4.9x10⁻¹¹ = 1.176x10⁻¹⁴
√1.176x10⁻¹⁴ = 1.084435337x10⁻⁷
pH= -log[H⁺]
pH= -log[1.084435337x10⁻⁷]
pH= 6.964796339
Answer:
1056.8 kJ
Explanation:
A sample of gas in a cylinder is provided with 623.9 kJ of heat. By convention, when the gas absorbs heat, it takes a positive sign, so Q = 623.9 kJ.
A piston then compresses the gas by doing 432.9 kJ of work to the gas. We work is done on the gas, it takes a positive sign, so W = 432.9 kJ.
The change in the internal energy (ΔU) is:
ΔU = Q + W
ΔU = 623.9 kJ + 432.9 kJ = 1056.8 kJ
Should remain the same, the volume will decrease.
Answer:
getting the right answer," we need true value to find out who is more accurate.
Explanation:
.
It is c) the energy that does work through chemical reactions