What is heat of vaporization?

oa
it is the heat required to change a substance's temperature by 1°c.

ob
it is the heat required to change a gram of substance from a solid to a liquid.

oc. it is the heat required to change a substance from a solid directly to a gas.

od. it is the heat required to change a gram of substance from a liquid to a gas.

oe it is the heat required to separate one substance into two substances.

1.4

2.3

step-by-step explanation:

the formula for the constant of variation is

y= kx

divide each side by x

y/x =kx/x

y/x =k

we know a and y

1.   y/x = k

4/1 =4

check the other values to make sure they are the same

8/2 = 4   12/3 =4   and 16/4 =4  

the constant of variation is 4

2.   y/x = k

3/1 =3

check the other values to make sure they are the same

6/2 = 3   9/3 =3   and 12/4 =3  

the constant of variation is 3

answer: 177/8

step-by-step explanation:

f(x)=2/3x-8, which give g(x) the greatest value.

step-by-step explanation: