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The Enthalpy of Combustion of Hydrogen Gas Is -285 ×\times 104 Kg Satellite with Enough Kinetic Energy to Reach the Provide

Question 151

Multiple Choice

The enthalpy of combustion of hydrogen gas is -285.8 kJ/mol.To provide a 2.20 ×\times 104 kg satellite with enough kinetic energy to reach the escape velocity of Earth (roughly 11.2 km/s) ,how many kilograms of H2 must be burned? (Kinetic energy =  The enthalpy of combustion of hydrogen gas is -285.8 kJ/mol.To provide a 2.20  \times  10<sup>4</sup> kg satellite with enough kinetic energy to reach the escape velocity of Earth (roughly 11.2 km/s) ,how many kilograms of H<sub>2</sub> must be burned? (Kinetic energy =   mv<sup>2</sup>,where mass is in kg and velocity is in m/s; 1 J = kg<sub> </sub><sup> </sup>.<sup> </sup>m<sup>2</sup>/s<sup>2</sup>)  A) 1.95  \times  10<sup>4</sup> kg B) 4.83  \times  10<sup>3</sup> kg C) 2.49  \times  10<sup>5</sup> kg D) 9.75  \times  10<sup>3</sup> kg E) 8.62  \times  10<sup>2</sup> kg mv2,where mass is in kg and velocity is in m/s; 1 J = kg . m2/s2)


A) 1.95 ×\times 104 kg
B) 4.83 ×\times 103 kg
C) 2.49 ×\times 105 kg
D) 9.75 ×\times 103 kg
E) 8.62 ×\times 102 kg

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