Magnesium reacts with oxygen as shown in the equation below: 2Mg + O2 2MgO Calculate the percentage yield of the reaction, given that burning 2.32 g of magnesium produced 2.39 g of magnesium oxide. (4 marks) I thought %yield = theoretical yield/maximum yield so is that all you do
ok thanks was wondering though why it would be 4 marks if youre just dividing the 2 given numbers and then x100
Most of the marks would be for working out theoretical yield. you obviously have to convert from grams to moles and back again so I think 4 marks is fair enough
Most of the marks would be for working out theoretical yield. you obviously have to convert from grams to moles and back again so I think 4 marks is fair enough
oh i havent learnt that? i thought %yield was that simple equation thats why im confused because i dont know how you do the extra step, grams to moles?
oh i havent learnt that? i thought %yield was that simple equation thats why im confused because i dont know how you do the extra step, grams to moles?
You should know an equation to convert between mass and moles
So, you can work out how many moles of magnesium you start with
you then know how many moles of MgO you can make
Then you can convert back again to get the theoretical yield of MgO in grams.
then you simply calculate [(actual yield)/ (theoretical yield)] * 100