Oxygen (
O
) has three naturally occurring isotopes:
16
O
,

17
O
,
and
18
O
.

16
O
is the most abundant isotope with an abundance of
99.757
%
and an isotopic mass of
15.995
u.
The second most abundant isotope is
18
O
with an abundance of
0.205
%
and an isotopic mass of
17.999
u.
The least abundant isotope,
17
O
,
has an abundance of only
0.038
%
and an isotopic mass of
16.999
u.

Calculate the average atomic mass of oxygen.

Calcium hydride (cah2) reacts with water to form hydrogen gas: cah2(s) + 2h2o(l) → ca(oh)2(aq) + 2h2(g) how many grams of cah2 are needed to generate 45.0 l of h2 gas at a pressure of 0.995 atm and a temperature of 32 °c?

Plz mark brainliest 30 points 1) find the momentum of a 12 kg snowball that is rolling with a velocity of 9 m/s. 2) an 8 ball with a mass of .5 kg is sitting at rest. it is hit by the cue ball (1 kg) traveling at 2.5 m/s. if the cue ball is at rest after the collision, how fast is the 8 ball traveling after the collision? 3) two football players are running toward each other. if the offensive player is 75 kg and is running 8 m/s, how fast must the 60 kg defensive player run in order for the two players to hit and stop?

Draw the skeletal structures of two different molecules that are each made of 5 carbon atoms and 12 hydrogen atoms.