2,g of steam condenses when passed through 40,g of water initially at 25,^oC . condensation of

English

Gujarati

Hindi

10-1.Thermometry, Thermal Expansion and Calorimetry

normal

$2\,g$ of steam condenses when passed through $40\,g$ of water initially at $25\,^oC$. The condensation of steam raises the temperature of water to $54.3\,^oC$, ........ $cal/g$ is the latent heat of steam ?

$540$

$536$

$270$

$480$

Solution

Heat gain = Heat loose

$\mathrm{m}_{\mathrm{w}} \mathrm{s}_{\mathrm{w}} \Delta \mathrm{T}=\mathrm{m}_{\mathrm{s}} \mathrm{L}+\mathrm{m}_{\mathrm{w}} \mathrm{s}_{\mathrm{w}}(\Delta \mathrm{T})$

$40 \times 1 \times(54.3-25)=2 \times \mathrm{L}+2 \times 1 \times(100-54.3)$

$\mathrm{L}=540.3 \mathrm{cal} / \mathrm{g}$

Standard 11

Physics

A beaker contains $200\,g$ of water. The heat capacity of the beaker is equal to that of $20\,g$ of water. The initial temperature of water in the beaker is $20\,^oC$. If $440\,g$ of hot water at $92\,^oC$ is poured in it, the final temperature (neglecting radiation loss) will be nearest to …….. $^oC$

normal

A coffee maker makes coffee by passing steam through a mixture of coffee powder, milk and water. If the steam is mixed at the rate of $50 \,g$ per minute in a mug containing $500 \,g$ of mixture, then it takes about $t_0$ seconds to make coffee at $70^{\circ} C$ when the initial temperature of the mixture is $25^{\circ} C$. The value of $t_0$ is close to ………. $s$ (ratio of latent heat of evaporation to specific heat of water is $540^{\circ} C$ and specific heat of the mixture can be taken to be the same as that of water)

hard

(KVPY-2018)

Two large holes are cut in a metal sheet. If this is heated, distances $AB$ and $BC$, (as shown)

normal

$1\, kg$ of ice at $-10\,^oC$ is mixed with $4.4\, kg$ of water at $30\,^oC$. The final temperature of mixture is …….. $^oC$ (specific heat of ice is $2100\, J/kg/k$)

normal

Solids expand on heating because …………….

normal

$2\,g$ of steam condenses when passed through $40\,g$ of water initially at $25\,^oC$. The condensation of steam raises the temperature of water to $54.3\,^oC$, ........ $cal/g$ is the latent heat of steam ?

Solution

Similar Questions

Two large holes are cut in a metal sheet. If this is heated, distances $AB$ and $BC$, (as shown)

$1\, kg$ of ice at $-10\,^oC$ is mixed with $4.4\, kg$ of water at $30\,^oC$. The final temperature of mixture is …….. $^oC$ (specific heat of ice is $2100\, J/kg/k$)

Solids expand on heating because …………….

Start a Free Trial Now