Question

Atoms to grams. How many grams of KNO3 are in
2.98 x 10 22 atoms of KNO3?

Answer 1

4.949 g

Step-by-step explanation:

One mole of any substance has 6.022 x
`10^(23)` atoms or particles.

Setting up ratio between moles and atoms:

Moles : Atoms

1 : 6.022 x
`10^(23)`

X : 2.98 x
`10^(22)`

X = (2.98 x
`10^(22)`)/(6.022 x
`10^(23)`)

X = 0.049 moles

The molar mass of KNO3 is : 39 + 14 + ( 16 x 3 ) = 101 g/mol

Moles : Mass

1 : 101

0.049 : X

X = 0.049 x 101

X = 4.949 g