Question

What mass of carbon monoxide must be burned to produce 175 kJ of heat under standard state conditions?

a) 176 g
b) 350 g
c) 88 g
d) 70 g

Answer 1

No mass of carbon monoxide needs to be burned to produce 175 kJ of heat under standard state conditions. The approximate correct option is (A).

Step-by-step explanation:

The enthalpy change for the combustion of carbon monoxide to carbon dioxide is given as -283.0 kJ/mol of CO. We can use this information to calculate the mass of carbon monoxide that must be burned to produce 175 kJ of heat.

First, we need to determine the number of moles of CO present in 175 kJ of heat. By dividing the heat energy by the enthalpy change per mole of CO, we get:

175 kJ / -283.0 kJ/mol = -0.618 mol of CO

Since the molar mass of CO is approximately 28 g/mol, we can calculate the mass of CO burned:

-0.618 mol * 28 g/mol = -17.3 g

However, mass cannot be negative, so the answer is 0 g. This means that no mass of carbon monoxide needs to be burned to produce 175 kJ of heat under standard state conditions.