Question

Question 5

2 pts
How many atoms of helium are found in a helium balloon if it has 3.9g of helium
inside?
The answer should be
x1023
Type the number that precedes the x1023

Answer 1

Answer: There are
`6.2* 10^(23)` atoms of helium are found in a helium balloon if it has 3.9 g of helium inside.

Step-by-step explanation:

According to avogadro's law, 1 mole of every substance weighs equal to the molecular mass and contains avogadro's number
`6.023* 10^(23)` of particles.

To calculate the moles, we use the equation:

`\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar Mass}}=(3.9g)/(4.00g/mol)=0.975moles`

1 mole of helium contains =
`6.023* 10^(23)` atoms

Thus 0.975 moles of helium contain =
`(6.023* 10^(23))/(1)* 0.975=6.2* 10^(23)` atoms