How many moles of H3O are present in an 85 L solution with a pH of 3.0?

To find the number of moles of H3O in the solution, you can use the formula pH -logH3O. First, calculate the concentration of H3O ions using the pH value:

pH -logH3O 3.0 -logH3O H3O 10(-3.0) 1.0 x 10(-3) M

Next, calculate the number of moles of H3O in the solution using the concentration and volume:

moles concentration x volume moles 1.0 x 10(-3) mol/L x 85 L moles 8.5 x 10(-2) moles

Therefore, there are 8.5 x 10(-2) moles of H3O present in the 85 L solution with a pH of 3.0.