How many molecules are there in 57.9 moles of H2O

3.49x 10^25 molecules H2O

Explanation: To find the number of molecules of H2O we will use the relationship between moles and Avogadro's Number.

57.9 moles H2O x 6.022x10²³ moles H2O / 1 mole H2O

= 3.49x10^25 molecules H2O

Cancel out the moles of H2O.

57.9 moles of H2O contains 3.48 × 10^25 molecules

Explanation:

⇒ 57.9 × 6.022 x 10^23 = 348.67 × 10^23

                                        = 3.48 × 10^25 molecules

nacl is added to the aqueous of what? ? in order to get a proper answer you have to specify the exact composition of the aqueous solution.

in scientific notation, the value of the  speed of light in a vacuum

  will be written as 2.995 * 10^8. when this value is represented in the form of

  a * 10^b, then, a = 2.995 and b = 8.

the value of the speed of light in a vacuum given above can also be rounded up to approximately 300000000. in this case, the scientific notation will be written as 3 *10^8.