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A storm drops 5.35 × 10^5 L of acid rain with a pH of 4.8 into a pond. How many moles of H3O+ rained into the pond?

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Final answer:

The number of moles of H3O+ that rained into the pond is approximately 3.55 moles.

Step-by-step explanation:

To calculate the number of moles of H3O+ in the acid rain, we need to multiply the concentration of H3O+ ions by the volume of the rain. The concentration of H3O+ ions can be determined using the pH scale. A pH of 4.8 indicates a concentration of 10^(-4.8) moles per liter.

Given:

  • Volume of acid rain: 5.35 × 10^5 L
  • pH of acid rain: 4.8

To calculate the moles of H3O+ ions, we can use the formula:

Moles of H3O+ = Concentration of H3O+ ions × Volume of acid rain

Concentration of H3O+ ions = 10^(-pH)

Substituting the given values:

Concentration of H3O+ ions = 10^(-4.8) moles/L

Moles of H3O+ = (10^(-4.8) moles/L) × (5.35 × 10^5 L)

Simplifying the expression:

Moles of H3O+ = 10^(-4.8 + 5.35) moles

Moles of H3O+ = 10^(0.55) moles

Moles of H3O+ = 3.55 moles

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