Which of the following statements about line graphs is true? a the dependent variable is on the horizontal axis. b line graphs are always straight lines. c every data point should be shown on a line graph. d there is a maximum number of data points that can be used in a line graph.

The answer is A, the dependent variable is on the horizontal axis. Since in the equation 2x=y, the values of y is dependent of the value of x. Line graphs can be curves. Not all data points need to be shown, and there is no maximum number of data points.

The amount of heat absorbed is 141.004 kJ.

Explanation:

In order to calculate the amount of heat released while converting given amount of steam (gaseous state) to ice (solid state), few processes are involved:

(1):

(2):  

(3):

(4):

Calculating the heat absorbed for the process having the same temperature:

      ......(i)

where,

q is the amount of heat absorbed, m is the mass of sample and is the enthalpy of fusion or vaporization

Calculating the heat released for the process having different temperature:

     ......(ii)

where,

= specific heat of solid or liquid

are final and initial temperatures respectively

For process 1:

We are given:

Putting values in equation (i), we get:

For process 2:

We are given:

Putting values in equation (i), we get:

For process 3:

We are given:

Putting values in equation (i), we get:

For process 4:

We are given:

Putting values in equation (i), we get:

Calculating the total amount of heat released:

                 (Conversion factor: 1 kJ = 1000J)

Hence, the amount of heat absorbed is 141.004 kJ.