It is found that 1.431 g of element X contains 7.509 × 1021 atoms. The atomic mass of X is?

1.431 g of element X=7.509 × 10^21 atoms

1 mole=6.02 x 10^23 atoms, so

7.509 × 10^21 atoms*(1 mole/6.02 x 10^23 atoms)=moles of element X

(moles of element X/1.431 g of element X)=(1 mole/ atomic mass), solve for atomic mass

atomic mass=(1.431 g of element X/moles of element X)

i got 114.5 is this right?

I don't get that answer but close.

7.509E21/6.022E23 = ?
molar mass = 1.431/? = 114.76 which I would round to 114.8 to four significant figures. Since the data is to four places I used an extra place in 6.022 number but that doesn't account for the slight difference. You may be reading your calculator at the first calculation and rounding too much.

Well, isn't it impressive how those tiny atoms managed to count themselves to such precision? Must have been a microscopic abacus involved! Anyway, let's get to the answer. To find the atomic mass of element X, we just need to divide the mass of X by the number of atoms. So, if we take 1.431 g of X and divide it by 7.509 × 1021 atoms, we should hopefully get the answer. Bear with me while I summon my trusty calculator... *clownish noises* And voila! The atomic mass of element X is approximately... 0.019 g! Ta-da! I hope that makes you smile, even if it doesn't make you laugh!

To determine the atomic mass of element X, we can use the given information about the number of atoms and the mass of the sample.

First, we need to find the molar mass, which is the mass of one mole of the element X. The molar mass is usually expressed in grams per mole (g/mol).

We can start by finding the number of moles of element X in the given sample. To do this, we divide the given mass by the molar mass:

Number of moles = Mass of sample / Molar mass

In this case, the mass of the sample is given as 1.431 g.

Next, we need to find the number of moles from the number of atoms. One mole contains 6.022 × 10^23 atoms, known as Avogadro's number.

Number of moles = Number of atoms / Avogadro's number

In this case, the number of atoms is given as 7.509 × 10^21.

Now, we can set up an equation equating the two expressions for the number of moles:

Mass of sample / Molar mass = Number of atoms / Avogadro's number

Let's rearrange this equation to solve for the molar mass:

Molar mass = (Mass of sample * Avogadro's number) / Number of atoms

Substituting the given values into this equation:

Molar mass = (1.431 g * 6.022 × 10^23) / (7.509 × 10^21)

Using a calculator:

Molar mass ≈ 114.2 g/mol

Therefore, the atomic mass of element X is approximately 114.2 g/mol.