With detailed explanation of the formulas**

a 10.0-gram sample of h2o(l) at 23.0°c absorbs 209 joules of heat. what is the final temperature of the h2o(l) sample?

(1) 5.0°c
(2) 18.0°c
(3) 28.0°c
(4) 50.0°c

Apeak with a retention time of 407 s has a width at half-height (w1/2) of 7.6 s. a neighboring peak is eluted 17 s later with a w1/2 of 9.4 s. a compound that is known not to be retained was eluted in 2.5 s. the peaks are not baseline resolved. how many theoretical plates would be needed to achieve a resolution of 1.5?

Asap! how do you lengthen a pattern piece? (family and consumer science, sewing)

Why are pipes bursting in the in extremely cold weather?