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seongwei

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**Problem Solving -- Calculate the mass of steam condensed**

1 ) A jet of steam at 100°C is directed into a hole in a large block of ice. After the steam has switched off, the condensed steam and melted ice are both a 0 degrees Celsius. The mass of water collected is 206 g. Calculate the mass of steam condensed.

Specific heat capacity of water is 4200 Jkg-1K-1

Specific heat capacity of ice is 2100 Jkg-1K-1

Latent heat of fusion is 330 X 1000 Jkg-1

Latent heat of vaporization is 2260 X 1000 Jkg-1

2 ) A mass of 450g of frozen vegetables is taken from a freezer at -20°C. The vegetables are immediately placed in saucepan containing 1100g of boiling water. The saucepan has a thermal capacity of 900J/K. The Final temperature of the saucepan,water and vegetables is 83°C.

a) calculate the specific heat capacity of the vegetables.

b ) the saucepan and its contents are then heated using a heater which provides 1200J of thermal energy each second. Determine how long it takes to bring the water back to its boiling point.

Can anyone solve these problems for me? Your help is very much appreciated.