Make a thermochemical equation if it is known that 444.4 kJ is absorbed during the decomposition

Make a thermochemical equation if it is known that 444.4 kJ is absorbed during the decomposition of one gram of copper hydroxide.

Given:
m (Cu (OH) 2) = 1 g
Q1 = 444.4 kJ

To find:
Thermochemical equation -?

Decision:
1) Calculate the molar mass of Cu (OH) 2:
M (Cu (OH) 2) = Mr (Cu (OH) 2) = Ar (Cu) * N (Cu) + Ar (O) * N (O) + Ar (H) * N (H) = 64 * 1 + 16 * 2 + 1 * 2 = 98 g / mol;
2) Calculate the amount of substance Cu (OH) 2:
n (Cu (OH) 2) = m (Cu (OH) 2) / M (Cu (OH) 2) = 1/98 = 0.01 mol;
3) Calculate the amount of energy:
0.01 mol Cu (OH) 2 – 444.4 kJ;
1 mol Cu (OH) 2 – Q kJ;
Q = 1 * 444.4 / 0.01 = 44440 kJ;
4) Write the equation of the thermochemical reaction:
Cu (OH) 2 => CuO + H2O – 44440 kJ.



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