7. The temperature of 950 g of water is increased from 25.5 °C to 28.5 °C on burning 0.75 g of a solid fuel in a bomb calorimeter. Water equivalent of calorimeter and latent heat of steam are 400 g and 587 cal/g, respectively. If the fuel contains 0.65% hydrogen, calculate the net calorific value. [Ans: 5365.66 cal/g]

If  Se is dopped with As  it will produce a(n) __________ semiconductor with __________ conductivity compared to pure Se.   A. p-type, decreased   B. n-type, decreased   C. p-type, increased   D. n-type, increased   E. intrinsic, identical

Can someone help me identify possible sources of errors while experimenting shell and tube heat exchangers? Explain clearly what will be the cause of this error. Thank you so much!