A boiler produces \(10 \mathrm{~kg}\) of steam \(/ \mathrm{kg}\) of coal burnt at \(50^{\circ} \mathrm{C}\). The steam pressure is 10 bar. Find the equivalent evaporation from and at \(100^{\circ} \mathrm{C}\) if the dryness fraction of steam is 0.98 .