Which process involves a decrease in entropy? burning natural gas water freezing into ice water evaporating on heating dry ice subliming

What is the number of moles of chemical units represented by 9.03x10^24? and how do i show work? (dumb it down )

How many molecules are found in 1.32 mol of nacl?

Achemistry student needs to standardize a fresh solution of sodium hydroxide. he carefully weighs out of oxalic acid , a diprotic acid that can be purchased inexpensively in high purity, and dissolves it in of distilled water. the student then titrates the oxalic acid solution with his sodium hydroxide solution. when the titration reaches the equivalence point, the student finds he has used of sodium hydroxide solution. calculate the molarity of the student's sodium hydroxide solution. be sure your answer has the correct number of significant digits.