Question

Answer the following.(a) A certain solution has a hydrogen ion concentration of 2.21 x 10-moles per liter. Write this number in standard notation.(b) A hippopotamus can weigh up to 9900 pounds. Write this number in scientific notation.(a) moles per liter(b) poundsх5?

Answer 1

Part A.

Given:

• 2.21 x 10⁻⁵ moles per liter.

Let's convert this number from scientific notation to standard notation.

To write in scientific notation, since the exponent is negative, move the decimal point 5 places to the left.

We have:

`\begin{gathered} 2.21*10^(-5) \\ \\ =0.0000221 \end{gathered}`

Therefore, the number in standard notation is 0.0000221 moles per liter

Part B.

Given the number:

9900

To write the number in scientific notation, move the decimal point from the right to left so there is only one non-zero number remaining on the left of the decimal.

The exponent of 10 will be the number of times the decimal was moved.

Since we moved left, the exponent will be positive.

We have:

`9.9*10^3`

ANSWER:

(a). 0.0000221 moles per liter

(b). 9.9 x 10³ pounds