Question

Calculate the percent decrease in the amount of dissolved O2 gas when raising 5 C the intial temperature

Answer 1

About a 8.91% decrease

Procedure

The initial temperature is 15 °C, raising the temperature by 5 °C results in 20 °C.

Therefore we read 2 values on the table the dissolved oxygen at 15 °C and the dissolved oxygen at 20 °C.

From the table, we see that at 15 °C we have about 10.1 mg/L of dissolved oxygen.

From the table, we see that at 20 °C we have about 9.2 mg/L of dissolved oxygen.

The percent decrease is calculated as follows

`\%\text{ }decrease=(final-initial)/(initial)*100\%`

Substituting the values we have that

`\%\text{ }decrease=(9.2-10.1)/(10.1)*100\%=8.91\%`
`\%\text{ }decrease=(9.2-10.1)/(10.1)*100\%=-8.91\%`

The result can be negative or preceded by the word a decrease of.