A car travels at a speed of 20.5 miles per hour. What is this speed in Km/sec and inches/min

0.00916432 km/s

21648 inches/minute

Explanation:

1 kilometre / second =

2236.936 miles per hour

20.5/2236.9=0.00916432km/s

1 mile per hour =

1056 inches / minute

20.5×1056=21648 inches/minute

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.

the answer is d. 74.02