Pls ! ( pls be 100% of your answer)chlorine is made up of two isotopes. 35chlorine makes up 75.8% of chlorine and 37chlorine makes up 24.4%. what is the average atomic mass for chlorine? (assume chlorine-35 has a weight of 35 amu and chlorine-37 has a mass of 37 amu)

37.000 amu
35.000 amu
35.558 amu
34.969 amu

Aglow stick contains a glass vial with chemicals. when the glow stick is bent, the vial breaks and the chemicals react to produce a glow. a science student observes that a glow stick kept in the freezer glows for a longer duration than a glow stick kept at room temperature. what conclusion can be drawn based on the observation? be sure to note the outcome and test variables in the conclusion.