Question

How many moles are in a 4.5g of Sulfur?

Answer 1

~0.14

Step-by-step explanation:

There are roughly ~0.14 moles in 4.5g of Sulfur. 1 mol = 32.06 g of Sulfur, so we just find the ratio and then multiply.

Answer 2

`\boxed {\boxed {\sf About \ 0.14 \ mol \ S }}`

Step-by-step explanation:

To convert from grams to moles we must use the molar mass. This can be found on the Periodic Table.

• Sulfur (S); 32.07 g/mol

We can use this number as a ratio or fraction.

`( 32.07 \ g \ S )/(1 \ mol \ S )`

Multiply by the given number of grams: 4.5

`4.5 \ g \ S *( 32.07 \ g \ S )/(1 \ mol \ S )`

Flip the fraction so the grams of sulfur cancel.

`4.5 \ g \ S *(1 \ mol \ S )/(32.07 \ g \ S)`

`4.5 *(1 \ mol \ S )/(32.07 )`

`(4.5 \ mol \ S )/(32.07 )`

`0.140318054 \ mol \ S`

The original measurement of grams had 2 significant figures, so our answer must have the same. For the number we calculated, that is the hundredth place.

The 0 in the thousandth place tells us to leave the 4.

`0.14 \ mol \ S`

There is about 0.14 moles of sulfur in 4.5 grams.