One (1) mole of ethanol (C6H60) can provide 327 kcal of energy when burned and one (1) mole of hydrogen (H2) provides 68.4 kcal of energy. Based on mass in grams, which chemical is a better source of energy? Show calculations

What does the symbol (–hfus) indicate in a phase change?

Anurse used a 0.02-mg/l solution of disinfection to clean a patients wound. what is the concentration of the solution expressed as a percentage?

Astudent pours 10.0 g of salt into a container of water and observes the amount of time it takes for the salt to dissolve. she then repeats the process using the same amounts of salt and water but this time she slowly stirs the mixture while it is dissolving. the student performs the experiment one more time but this time she stirs the mixture rapidly. the dependent variable in this experiment is: time for salt to dissolve speed of stirring amount of water mass of salt