please calculate Delta Hf for CaC2

From the following enthalpy of reaction data and $? H_{f}^{?}$ data, calculate $? H_{f}^{?}$ for $CaC_{2} (s)$ $CaC_{2} (s) + 2 H_{2} O (l) ? Ca (OH)_{2} (s) + C_{2} H_{2} (g) ? H^{?} = ? 127.2 kJ$ For $H_{2} O (l), Ca (OH)_{2} (s)$ , and $C_{2} H_{2} (g) ? H_{f}^{?}$ is equal to $? 285.83 kJ, ? 986.2 kJ$ , and $227.4 kJ$ respectively. Express your answer in kilojoules to three significant figures.

Question

please calculate Delta Hf for CaC2

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From the following enthalpy of reaction data and

? H_{f}^{?}

data, calculate

? H_{f}^{?}

for

CaC_{2} (s)

CaC_{2} (s) + 2 H_{2} O (l) ? Ca (OH)_{2} (s) + C_{2} H_{2} (g) ? H^{?} = ? 127.2 kJ

For

H_{2} O (l), Ca (OH)_{2} (s)

, and

C_{2} H_{2} (g) ? H_{f}^{?}

is equal to

? 285.83 kJ, ? 986.2 kJ

, and

227.4 kJ

respectively. Express your answer in kilojoules to three significant figures.

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