Me on i'll mark !
oxygen has three isotopes: o16 , o17 , and o18 . in any given sample, 99.757% is o16 , 0.038% is o17 , and 0.205% is o18 . the atomic mass of each is as follows: o16=15.995 amu ; o17=16.999 amu ; o18=17.999 amu .
what is the average atomic mass of oxygen?
a) 15.995 amu
b) 15.999 amu
c) 16.060 amu
d) 16.099 amu

It has been two weeks since charles met with daniel, a dietitian, who provided charles with a menu for weight loss. charles and his mother are going back to see daniel again with a chart of the food charles has eaten. the following lists what charles ate in one day: breakfast 1 banana, 1 cup of nonfat milk, 1 egg lunch 1 cup of carrots, 3 oz of steak, 1 apple, 1 cup of nonfat milk dinner 6 oz of skinless chicken, 1 baked potato, 3 oz of broccoli, 1 cup of nonfat milk

10. translate each of the following chemical equations into a sentence. a. 2 zns(s) + 3 o2(g) -> 2 zno(s) + 2 so2(g) b. cah2(s) + 2 h2o(l) -> ca(oh)2 (aq) + 2 h2(g)

In the 1800s, one of the statements in john dalton's atomic theory was that atoms are indivisible. later experimental evidence led to the discovery of subatomic particles such as neutrons, electrons, and protons. what happened to the indivisible atom part of dalton's atomic theory, and why?