Question

How many grams are 2.50 * 10^23 molecules of CaO?

Answer 1

134.56 grams are 2.50 * 10^23 molecules of CaO.

Explanation:

According to Avagadro hypothesis, 1 mole of a substance contain 6.023 x 10^23 molecules or particles.

Data given:

Number of molecules of CaO =

FORMULA USED IN CALCULATION:

number of molecules = 6.02 x 10^23 x number of moles of CaO

At first number of moles is calculated:

$\frac{6.02 x 10^23}{2.50 X 10^23}$

= 2.4 moles of CaO is present

to calculate the mass of CaO in grams formula used is

mass = atomic mass x number of moles

atomic mass of CaO = 56.07 grams/mole

mass = 2.4 x 56.07

          = 134.56 grams of calcium oxide is present is 2.50 * 10^23 molecules of CaO.