Answer to Question #157431 in General Chemistry for rome

Question

A piece of nickel is heated to 107.2 °C. It is then submerged into 235.0 g of water at 22.6 °C that is in a coffee cup calorimeter. The final temperature of the mixture is 28.8 °C. What is the mass of the nickel (in nanograms)? Specific heat of nickel is 0.440 J/g°C. The elemental symbol for nickel is _____?(fill in blank)

Answer 1

Specific heat(C) of H₂O = 4,2 J/g°C

$C = E/(m*\Delta T)$

$\Delta T = 28,8°C - 22,6°C = 6,2°C$

E = 4,24,2 J/g°C *6,2°C*235g = 6119,4J

m(of nickel) = 6119,4J/(0,440J/g°C*78,4°C) = 177,4g

177,4g = 177,4*10^-9ng

Answer: 177,4*10^-9ng, The elemental symbol for nickel is Ni.