Calculate the amount of heat needed to melt 18.8 of solid hexane (C6H14) and bring it to a temperature of -55.5 degrees Celsius . Be sure your answer has a unit symbol and the correct number of significant digits.

What is the mass defect of a mole of nuclei with 1.8 x 10^15 j/mol binding energy?

Astudent carefully transfers 30 g of water and 30 g of alcohol in a glass tube, forming two layers and filling the tube completely. after sealing the tube, the student mixes the solutions, and notices a bubble that forms in the tube. what is the mass of the contents in the glass tube after mixing?

Name the element in group 17, period 2. (periodic table)