Question

may i have the answer for both please

4. To which one of these reactions occurring at 25°C does the symbol AHA (H,SO) refer? A. 2H(g)+ S(g)+ 40(g)H,SO () B. H,(g) +Slg)+20,(g) --> H,SO,() C. H,SO.() H,(g) + $(s) + 20,(g) D. H,SO,)2H(g)+S(s) + 40(g) E. H,(e)+S(s)+ 20,(g)H,SO()

Answer 1

3)

C₃H_{​​​​8} +5 O_{​​​​​​2} ----------> 3CO_{​​​​​2} + 4H₂O+2220 kJ/mol

One mole of propane gives 2220 kJ of energy.

Molar mass of propane: 44 g/mol

ie 44 g of propane liberates 2220 kJ of energy

88 g of propane gives how much energy

= 88*2220/44

= 4440 kJ

ie ∆H = -4440 kJ

Option A is correct.

4)

Enthalpy of formation is the amount of heat liberated or absorbed when 1 mole of compound is formed from its elements.

Option C & D are decomposition reactions.

Option E is correct

H_{​​​​​​2} (g) + S(s) + 2O₂ (g) -------> H₂SO₄ (l)