L15 - Heat & Mole Calculations

N₂ +  3H₂ −->  2NH₃ 
How many moles of ammonia are produced when 3 moles of nitrogen react with hydrogen?

• 6 moles ammonia
• 1.5 moles ammonia
• 9 moles ammonia
• 9 moles hydrogen

Using the following equation:
Fe₂O₃(s) + 3H₂(g) → 2Fe(s) + 3H₂O(l)
How many moles of iron can be made from  6 moles H₂? 

• 4 moles Fe
• 6 moles Fe
• 9 moles Fe
• 2 moles Fe

Given S(s) + O₂(g) ---> SO₂(g) ΔH = -287 kJmol^-1

if you burn 16 g of sulfur (S), how many moles of sulfur was burnt

M(S) = 32 g mol^-1

Given S(s) + O₂(g) ---> SO₂(g) ΔH = -287 kJmol^-1

if you burn 16 g of sulfur (S) how many kJ of heat is released/

M(S) = 32 g mol^-1

Given 2SO_2(s) + O_2(g) ---> 2SO_3(g) ΔH = -99 kJmol^-1

If the amount of heat released is 445.5 kJ how many moles of Oxygen gas was needed

• 2.5

• 3.5

• 4.5

• 5.5

• More information needed

Given 2SO_2(s) + O_2(g) ---> 2SO_3(g) ΔH = -99 kJmol^-1

If the amount of heat released is 445.5 kJ how many grams of SO₂ was used

M(SO₂) = 64.0 g mol^-1

• 28.8 g

• 288 g

• 2880 g

• More information needed

Given N_2(s) + 3H_2(g) ---> 2NH_3(g) ΔH = +1335 kJ mol^-1

Is this reaction exothermic or endothermic

• endothermic

• exothermic

Given N_2(s) + 3H_2(g) ---> 2NH_3(g) ΔH = +1335 kJ mol^-1

How many moles of ammonia are produced of 2 moles of nitrogen was reacted ?

• 1

• 2

• 3

• 4

• 5

Given N_2(s) + 3H_2(g) ---> 2NH_3(g) ΔH = +1335 kJ mol^-1

If the reaction absorbed 600 kJ of energy, how many moles of N2 was reacted

• 0.449

• 0.45

• 44.9

• 4.49

• 4.5

Given N_2(s) + 3H_2(g) ---> 2NH_3(g) ΔH = +1335 kJ mol^-1

If the reaction absorbed 600 kJ of energy, how many grams of O₂ was reacted

M(O₂) = 32.0 g mol^-1 (Ans to 3 sf)