If an acid....?

Question

has an H+ concentration of 1.0 x 10 to the -4, what is the pH?

2.)what is the hydrogen ion concentration of stomach acid? (pH=2)

3.)A birthday balloon is blown up with dry air to a volume of 8.4 cm3. what volume is oxygen?

4.)convert 36 L of N2 into grams.

5.)Aerobic respiration, or the process by which animals use energy by breaking down glucose in the presants of oxygen, is described by the equation C6 H12 O6 + O2-->CO2 + H2O.

A.) balance the equation

B.) calculate how much carbon dioxide is exhaled if an animal inhales 32.0 g O2.

6.)1.5 kg of fuel is burned on a natural gas grill during a BB-Q. how much heat is released in Kcal?

7.)if you use a liter (1000ml) bottle of oil in your engine, how much heat is produced in Kcal? in BTU? to solve this problem you must know the density of motor oil is .82g/ml

Answer 1

1) pH = 4
2) 1 x 10^-2 M
3) Are you sure about the volume of the balloon? 8.4 cm3 is pretty small. Anyway, air is about 21% oxygen, so multiply the balloon volume by 0.21
4) Are we at STP? If not then I can't solve this. If we are at STP then 22.4 L = 1 mole.
36 L x (1 mol / 22.4 L) x (28 g N2 / mol) = 45 g N2
5) C6H12O6 + 6 O2 ==> 6 CO2 + 6 H2O

32 g O2 = 1 mole, which means that 1 mole of CO2 (44 g CO2) would be exhaled, if we use the coefficient ratio from the equation.

6) Propane? Butane? I need more info on the fuel.

7) Again, more info in needed in terms of the enthalpy of combustion. How much heat is released when 1 mole of oil burns? What is the chemical formula of the oil?

Answer 2

1) 4
2) 10^-2 M
3) 1.741 cm^3
4) At what temp. and pressure ????????
5) C6 H12 O6 + 6O2-->6CO2 + 6H2O.
B) 44 g
Energy data is required.