A sample of water at 17.6°C required an input of 2.33 x 10^ J of heat to reach its boiling point, 100.0 °C. What was the mass of the water?

since electrons are negative the answer is neagtaive

answer; the numbers of valence electrons in the acetic acid molecule (ch3co2h) is 24;

answer: semi-infinite solid initially at a uniform temperature of 400 ◦c is cooled at its surface by convection. the cooling fluid at a constant temperature of 200 ◦c has a convective coefficient (ha) of 250 w/m2.k. the physical properties of the solid: k = 20 w/m.k and α = 4 * 10-5  m2/s. using δx = 0.04 m and δt = 10 s. write the finite difference equations describing the transient heat transfer of the first five δx and the temperature profile after 30 s.