Steam at $100^\circ\text{C}$ is passed into $1\,\text{kg}$ of water contained in a calorimeter of water equivalent $0.2\,\text{kg}$ at $9^\circ\text{C}$ till the temperature of the calorimeter and water in it is increased to $90^\circ\text{C}$. The mass of steam condensed in kg is nearly (specific heat of water $= 1\,\text{cal/g}^\circ\text{C}$, latent heat of vaporisation $= 540\,\text{cal/g}$)