Consider the following reaction: #2Mg(s) + O_2(g) -> 2MgO(s)#, #DeltaH = -1204kJ#. Is this reaction exothermic or endothermic? How do you calculate the amount of heat transferred when 2.4 grams of Mg(s) reacts at constant pressure?
How many grams of MgO are produced during an enthalpy change of -96.0 kJ? How many kilojoules of heat are absorbed when 7.50 g of MgO(s) is decomposed into Mg(s) and #O_2(g)# at constant pressure?
How many grams of MgO are produced during an enthalpy change of -96.0 kJ? How many kilojoules of heat are absorbed when 7.50 g of MgO(s) is decomposed into Mg(s) and
1 Answer
This reaction as written is clearly
Explanation:
We has..............
To make the arithmetic a bit easier we could write........
I am CLEARLY free to do this because
And so we combust a
And thus for the given molar quantity of magnesium,
So, in effect, we have treated enthalpy as a stoichiometric product of the reaction (which indeed it is!). And if
And when
Finally, you have proposed that a given mass of