A crucible with a coal sample weighted 9.2710 g after heating at 108 0C for 1hr and coal sample analyzed for having 30% of moisture. This sample was further heated at 920 0C in crucible with lid for 7 min and then without lid at 750 0C and weighted 9.2131 g and 8.8758 g respectively. Finally, 0.3102 g of ash was washed off from the crucible for further use. Give a proximate analysis of given coal sample

The proximate analysis of a coal sample involves the determination of various components of coal, such as moisture, volatile matter, fixed carbon, and ash.

1. Moisture Content: The moisture content is given as 30%.

2. Volatile Matter: This is calculated by subtracting the weight of the sample after heating at 920°C with the lid on from the initial weight of the sample, then dividing by the initial weight and multiplying by 100.

   (9.2710 g - 9.2131 g) / 9.2710 g * 100 = 0.625%

3. Fixed Carbon: This is calculated by subtracting the weight of the sample after heating at 750°C without the lid from the weight of the sample after heating at 920°C with the lid on, then dividing by the initial weight and multiplying by 100.

   (9.2131 g - 8.8758 g) / 9.2710 g * 100 = 3.64%

4. Ash Content: This is calculated by dividing the weight of the ash by the initial weight of the sample and multiplying by 100.

   0.3102 g / 9.2710 g * 100 = 3.34%

So, the proximate analysis of the coal sample is:

• Moisture: 30%
• Volatile Matter: 0.625%
• Fixed Carbon: 3.64%
• Ash: 3.34%

Please note that these values are approximate and actual values may vary depending on the specific conditions of the experiment.