What is the mass of a sample of nh3 containing 3,80 x 10^24 molecules of nh3?
748 grams
894 grams
101 grams
107 grams

107 grams

Explanation:

1 mole of any substance contains 6.022*10²³ molecules/ions/atoms.

1 mole of contains 6.022*10²³ molecules of .

Since molar mass of   is 17 grams,

17 g of NH3 contains 6.022*10²³ molecules of .

We have to find the mass of NH3 when it contains molecules.

By unitary method, it is .

Hence 107 grams of contains molecules of .

a chemical reaction

explanation:

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.