19) Solve. 1
How many moles of CH4 gas are in
3.8 x 1024 molecules?
1
61 mol
100 mol
h
.16 mol
6.3 mol

There are 6.312 moles of CH4 gas in 3.8 x 10²⁴ molecules.

HOW TO CALCULATE NUMBER OF MOLES:

Therefore, there are 6.312 moles of CH4 gas in 3.8 x 10²⁴ molecules.

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Moles of CH₄ = 6.3

Given

3.8 x 10²⁴ molecules of CH₄ gas

Required

The number of moles

Solution

1 mol = 6.02 x 10²³ particles (molecules, atoms, ions)

Can be formulated :

N = n x No

No = Avogadro's number

Input the value :

n = N / No

n = 3.8 x 10²⁴ /6.02 x 10²³

n = 6.3 moles

23.5

23.5

47.0

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.