Hi:) Anyone able to help with 1(d)? Thanks!

different number of isotopes

Explanation:

Chlorine has isotopes which are different even though they apply to the same element. Chlorine has the isotopes 35 and 37, in a 3:1 arrangement and the average of the isotopes is about 35.5(you do not round the decimal)

to calculate relative atomic mass of chlorine-35 and chlorine 37:

(occurance in nature/100)*35+ (occurance in nature/100)*37=35.5

occurance in nature for chlorine 35: 75%

Ocurance in nature for chlorine 37: 25%

so

75/100*35= 26.25

26.25 +(25/100)*37=35.5

26.25+9.25=25.5

Hope this helps!

what does the table look like

a). in this case, dh> 0 and sd> 0. if t becomes larger, the term "-tds" will become more negative. at some point, it is possible that -dts will be more negative than the dh is positive, and the reaction will become spontaneous. this is probably the correct answer, but you should look at all of the other possibilities and make sure of that.