<span>a. True
The body's pH level is critical to the functioning of the bodies cells. A pH in the range of 7.35 to 7.45 is considered "normal", although a large number of doctors get nervous if the pH is towards the outer edges of that range. If your pH gets down to 6.9, you'll be a coma. At 6.8, you're dead. And if the pH goes up to 7.8, you're also dead.</span>
Assuming ideality:
PV=nRT
Pv= (mass/molarmass)RT
Solve for the mass :-)
I would suggest you to use this instead.
Just place the known substance for example O2 Oxygen as they are asking you, and see where the diagram takes you.
So the answer would be 2 because you’d look at the coefficients of the balanced equation up there. H2O
I hope that was helpful, if you have more questions please ask!
5. The left team..
9. I think it is blue spheres..
Hope this helps... :)