Which statement is false?
a. δerxn is a measure of heat.
b. enthalpy is the sum of a system's internal energy and the product of pressure and volume.
c. δhrxn is the heat of reaction.
d. an exothermic reaction gives heat off heat to the surroundings.
e. endothermic has a positive δh.

The false statement is a. ΔErxn is a measure of heat.

Explanation:

ΔErxn represents the energy change in a chemical reaction. However, in real processes the energy change is not only a measure of heat but also other forms like work and potential and kinetic energy.

Enthalpy is actually defined like the sum of a system's internal energy and the product of pressure and volume, so b is correct.

ΔHrxn is also the heat of reaction, which is also true

The last ones are also true

the total distance traveled by the car is

30km + 49km = 79 km .

0.93xc=0.93x3x10^8m/s

2.54cm is 1 inch

360seconds i 1 hr