For the first one it’s 69 just count the little lines from the side.
one mole of P weights about 31 grams
in one mole there are 6.022*10^23 atoms
we use the rule of threes
6.022*10^23atoms......weight..........31 grams
3.45*10^23 atoms.........weight...........x grams
x=(3.45*10^23*31)/6.022*10^23
x=106.95/6.022=<u><em>17.76 grams</em></u>
Parents SHOULDN'T avoid sharing their own mistakes with children.
Answer:
the mass of the air in the room is 4.96512 kg ( in 0°C)
The answer is a. hemoglobin is the molecule that transports oxygen in red blood cells :))))
i hope this is helpful
have a nice day
