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chem oct/nov 2010 p11 help
- Thread starter robinho10
- Start date
- Messages
- 57
- Reaction score
- 7
- Points
- 8
The mass of nickel is 20% * 10 = 2g
The Ar of nickel is 58.7 so the number of moles is 2/58.7
Multiply the number of moles by Avogadro's constant ie 6.02E23 (which is the number of particles per mole) and u will get the answer A
Energy = mass * specific heat capacity * temperature change = 200 * 4.2 * 48
But this is only 45% of the energy released so divide the answer by 0.45 to get the total energy released
Finally, divide the total energy by the mass which is 1.6g and u will get the answer B
The Ar of nickel is 58.7 so the number of moles is 2/58.7
Multiply the number of moles by Avogadro's constant ie 6.02E23 (which is the number of particles per mole) and u will get the answer A
Energy = mass * specific heat capacity * temperature change = 200 * 4.2 * 48
But this is only 45% of the energy released so divide the answer by 0.45 to get the total energy released
Finally, divide the total energy by the mass which is 1.6g and u will get the answer B
- Messages
- 57
- Reaction score
- 7
- Points
- 8
U r most welcome 