Entropy type of question

TheNoobishKnight

Any method for this? Haven't come across this type of question before.

Reply 1

charco

Study Forum Helper

Original post by TheNoobishKnight

Any method for this? Haven't come across this type of question before.

Entropy is an absolute quantity. It is also extensive.

Hence the entropy change is equal to the entropy of the products - the entropy of the reactants.

Reply 2

TheNoobishKnight

Original post by charco

Entropy is an absolute quantity. It is also extensive.

Hence the entropy change is equal to the entropy of the products - the entropy of the reactants.

When I looked on the mark scheme, first you had to divide that big number by the delta H. Then you had to do something else.

But I don't understand what you are telling here? Do you mean SP-SR?

Reply 3

langlitz

Original post by TheNoobishKnight

When I looked on the mark scheme, first you had to divide that big number by the delta H. Then you had to do something else.

But I don't understand what you are telling here? Do you mean SP-SR?

You divide by delta H to find the number of moles of glucose produced from that much energy, since enthalpy is in kJ/mol. You'd then want to multiply by 6 to give the number of moles of CO2. Since from the balanced equation there is 6:1 ratio of CO2:glucose. Then use the molar mass of CO2 to work out the mass taken in by the plants

Reply 4

charco

Study Forum Helper

Original post by TheNoobishKnight

When I looked on the mark scheme, first you had to divide that big number by the delta H. Then you had to do something else.

But I don't understand what you are telling here? Do you mean SP-SR?