Aballoon contains 5l of oxygen at a pressure of 90 kpa. how much oxygen will the ballon contain if the pressure is lowered to 67 kpa.

1- According to this formula:
P1V1 = P2V2

2-By converting P from KPa to atm:
1 KPa = 0.00986923267 atm
So, 
P1= 0.888231 atm
P2 = 0.661239 atm

by substitution on the previous formula:
P1V1 = P2V2
0.888231 x 5 = 0.661239 x V2
So,
V2(for the oxygen will the ballon contain) = 6.7 L

Hno3(aq) → h+(aq) + no3−(aq). picture ii best represents the strong acid hno3. strong acids are strong electrolytes

The density of water is 1 g/cm cubed and in order for the pebble to sink its density has to be greater than the density of water and in order for the twig to float its density has to be less than the density of water