Question

How many moles are in a 4.5g of Sulfur?

Answer 1

Answer:

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

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.

$\frac{ 32.07 \ g \ S }{1 \ mol \ S }$

Multiply by the given number of grams: 4.5

$4.5 \ g \ S *\frac{ 32.07 \ g \ S }{1 \ mol \ S }$

Flip the fraction so the grams of sulfur cancel.

$4.5 \ g \ S *\frac{1 \ mol \ S }{32.07 \ g \ S}$

$4.5 *\frac{1 \ mol \ S }{32.07 }$

$\frac{4.5 \ mol \ S }{32.07 }$

$0.140318054 \ mol \ S$

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.

Answer 2

Answer:

~0.14

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.