HELP!!!!!! ANYONE!!!!
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HELP!!!!!! ANYONE!!!!

[From: ] [author: ] [Date: 11-11-07] [Hit: ]
Calculate the enthalpy change when 4.73 g of hydrogen gas is reacted with excess oxygen.-1)... 561.......
1) 561.2 J of heat was added to 8.00 g of water. The final temperature of the water was measured to be 64.2°C. What was the initial temperature of the water? (specific heat capacity of water = 4.184 J/g°C)

2)For the reaction
H2 + ½ O2 → H2O (ΔrH = –286 kJ/mol)
What is the enthalpy change when 15.0 mol of hydrogen gas reacts with excess oxygen.

3)For the reaction
H2 + ½ O2 → H2O (ΔrH = –286 kJ/mol)
Calculate the enthalpy change when 4.73 g of hydrogen gas is reacted with excess oxygen.

-
1)... 561.2J = 8.00g x 4.184J/g°C x (64.2°C - To).. solve for To

2).. 15.0moles x (-286 kJ/mole) = __ kJ

3).. 4.73g H2 x (1 mole H2 / 2.016g H2) x (-286 kJ/mole) = __ kJ
1
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