Question

Can someone please check my answers and make sure they're correct?
A) How much heat would it take to raise the temperature of 46.0 g of water from 90.0 to 100.0 C? Answer using correct sig figs, sign, and units. My answer: +1.92x10^3 J

B) How many joules are released when 84.0 g of C2H6 burn according to the equation: 2C2H6 + 7O2 --> 4CO2 + 6H2O + 1200 kJ (energy released). Answer using correct sig figs, sign, and units.
My answer: -1.68x10^6 J

C) Calculate delta E for a process where a system absorbs 88 kJ and performs 47 kJ of work. Answer using correct sig figs, sign, and units.
My answer: +41 kJ

Thanks!

Answer 1

Those look ok to me.