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1 g of coal on complete combustion liber...

`1 g` of coal on complete combustion liberates `18 k J` of heat. Calculate the amount of coal required to liberate the same amount of heat that an electric heater of `2 kW` provides in `1 h`.
or
Electricity generated by a windmill is another form of solar energy. Explain ?

Text Solution

Verified by Experts

`2 kW xx 1h = 2 kW xx 3600 s = 7200 kJ = 7200 kJ(18 kJ//g) = 400 g`
or
N/A.
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Knowledge Check

  • The amount of heat energy required to raise the tmperature of 1 g of Helium at NTP, from T_1K to T_2K is

    A
    `3/2N_aK_B (T_2-T_1)`
    B
    `3/4 N_a K_B (T_2-T_1)`
    C
    `3/4 N_aK_B (T_2/T_1)`
    D
    `3/8 N_a K_B(T_2-T_1)`

  • The amount of heat energy required to raise the temperature of 1 g of Helium at NTP, from T_(1) K to T_(2) K is :

    A
    `(3)/(4)N_(a)k_(B)((T_(2))/(T_(1)))`
    B
    `(3)/(8)N_(a)k_(b)(T_(2)-T_(1))`
    C
    `(3)/(2)N_(a)k_(B)(T_(2)-T_(1))`
    D
    `(3)/(4)N_(a)k_(B)(T_(2)-T_(1))`

  • The amount of heat energy required to raise the temperature of 1 g of Helium at NTP , from T_(1)K to T_(2)K is

    A
    `3/4N_(a)k_(B)(T_(2)/T_(1))`
    B
    `3/8N_(a)K_(B)(T_(2)-T_(1)`
    C
    `3/2N_(a)K_(B)(T_(2)-T_(1)`
    D
    `3/4 N_(a)K_(B)(T_(2)-T_(1)`

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