Magnesium nitrate decomposes on heating to form magnesium oxide, nitrogen dioxide and oxygen as shown in the following equation.
2Mg(NO3)2 (s) > 2MgO(s) + 4NO2(g) + O2(g)
(a) thermal decompsoition of a sample of magnesium nitrate produced 0.741g of magnesium oxide.
(a.i) calculate the amount, in moles of MgO in 0.741g of magnesium oxide.
Answer: 0.018moles <-- 呢part我識 下part就吾明
(a.ii) calculate the total amount, in moles, of gas produced from this sample of magesium nitrate
n(Mg(NO3)2)= 0.018 X 5/2 <------------- 點解要乘5/2,,, 請解釋... 吾明