Chemistry Cfe

Use the information in your databook to calculate the enthalpy change for the following reaction:

H_2(g) + Cl_2(g) --> 2HCl_(g)

• 172

• 200

• -185

• 450

Tags

enthalpy

1. Chloromethane can be produced by the reaction of methane with chlorine.

CH₄(g) + Cl₂(g) --> CH₃Cl(g) + HCl(g)

Using bond enthalpies from the data booklet, calculate the enthalpy change, in kJmol⁻¹, for this reaction

• 26

• -234

• 15

• -115

Tags

enthalpy

1. 0.22g of propane (C₃H₈) was used to heat 200cm³ of water. The temperature of water was raised by 35^oC. Calculate the enthalpy of combustion of propane.

• -5852

• -3218

• 2297

• 3456

Tags

enthalpy

The enthalpy of combustion can be described as

• When 1 mole of solute dissolves in water

• When 1 mole of substance is fully combusted in oxygen

• 1 one mole of water is produced in a neutralisation reaction

Tags

NGSS.HS-PS1-4

6.9 g of ethanol (C₂H₅OH) was burned and the heat produced was used to raise the temperature of one litre of water by 49^oC. Assuming all the heat released by the burning ethanol was absorbed by the water; calculate the enthalpy of combustion of ethanol.

• 204

• 1365

• -1365

• -768

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

NGSS.HS-PS3-4

1. The enthalpy of combustion of methanol (CH₃OH) is -715kJ mol^-1. What mass of methanol would be burned to produce 71.5kJ of energy?

• 6.4

• 32

• 3.2

• 7.15

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

Use Hess's Law to calculate the enthalpy of combustion of methane

• - 891 KJ mol^-1

• - 605 KJ mol^-1

• - 1041 KJ mol^-1

• - 1435 KJ mol^-1

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

Calculate the enthalpy of combustion of ethane using Hess's Law

• - 1561 KJ mol^-1

• - 1731 KJ mol^-1

• - 1167 KJ mol^-1

• - 989 KJ mol^-1

Tags

NGSS.HS-PS1-4

Using bond enthalpies in the data booklet, calculate the energy to convert 2 moles of O₂ molecules into 4 moles of oxygen atoms in the below reaction.

2 O₂ ------------> 4 O

• 996 KJ

• 1192 KJ

• - 996 KJ

• 996 KJmol^-1

Tags

NGSS.HS-PS1-4

Equilibrium is a __________ process

• Static
• Dynamic
• Probabilistic
• Fictitious