Question 4
jenna ran around the school's track with an average speed of 4 km/h. how can jill get a higher average speed than jenna?
a
she can run the same distance in a shorter amount of time.

b
she can run the same distance in a longer amount of time.

c
she can run twice the distance in twice the amount of time.

d
she can run half the distance in half the amount of time.

A. She can run the same distance in a shorter amount of time.

Explanation:

Speed can be computed with the formula:

Where:

v = speed

d = distance

t = time

So if you look at the formula, distance there tells you how far an object has traveled, and the time tells us how long it took to cover that distance. As you can see, speed and time are inversely proportional. This means that as one goes up, the other goes down. So if we reduce time travelling a certain distance, the speed increases.

first one is the correct answer

answer: the value of enthalpy change will be -152.80 kj.

solution:

pressure = 1atm , temperature = = 298 k

given that pressure and temperature are same in both gases , the number of moles of both gases can be determined by the ideal gas equation.

according to reaction 3 moles no are reacting with 1 mol of ,then 0.49 mol of no will react with moles of ozone that is 0.16 moles of ozone. since, no is limiting reagent and is an excessive reagent.

enthalpy change for the reaction between the given volumes of the gases is :