Question

In the reaction, 210 kJ of heat energy is used to form 3.0 moles of hydrogen.

Calculate how much heat energy is needed to make 1000 kg of hydrogen.​

Answer 1

Heat energy needed : 3.5 x 10⁷ kJ

Further explanation

Heat is a form of energy that can flow from high-temperature objects to low-temperature objects.

So heat moves when there is a difference in temperature and can increase or decrease the temperature. An object that receives a lot of heat will cause a large increase in temperature

The amount of heat is influenced by the mass of the object and the difference in temperature

Can be formulated

Q = m.c.Δt

Q: heat received or removed by an object (J)

m: object mass (kg)

c: heat type substance (J / kg⁰C)

ΔT: temperature change (⁰C)

210 kJ of heat energy is used to form 3.0 moles of Hydrogen, so heat energy for 1 mol Hydrogen :

`\tt (210)/(3)=70~kJ/mol`

mol of 1000 kg of Hydrogen=10⁶ g(MW=2 g/mol)

`\tt (10^6~g)/(2)=5.10^5`

The heat energy :

`\tt 70~kJ/mol* 5.10^5~mol=3.5* 10^7~kJ`