(2) 0 C is the correct answer.

The equilibrium between solid and liquid water exists at Standard temperature and pressure, which is defined as 101.3 kPa and 0C or 298K.

1) Chemical energy to electrical energy is the correct answer.

A voltaic cell is also known as a battery.  Stored chemical energy is converted into electrical energy using the transfer of ions.

(1) 2.5 L is the correct answer.

If we plug in the values for Standard temperature (0C or 273K) and pressure (101.3 kPa or 1atm) into the ratio for gases, we can find the ratio for PV = nRT

You can ignore the factor ‘’R’’ as it is present in both equations.

(1atm) x (2L ) = n (273) ------ (1x2)/ 273 = .007 moles

(.88atm) x (zL) = .007 moles (303)

X = 2.5

Here is an example of an endothermic energy diagram. Your axes will be labels potential energy on the y axis and reaction pathway on the x axis.  The reactants have a lower potential energy than the products as energy is required for the reaction to occur.

The average kinetic energy is changing between AB and CD, where the slope of the line is positive.

The sample during CD is in a single phase and capable of conducting electricity.