How many moles are in 15.62g of P?

Question

asked Sep 28, 2022 154k views

1 Answer

Snger · Answer 1 · 2022-10-04T09:03:43+0000

Answer:

$\boxed {\boxed {\sf 0.5043 \ mol \ P}}$

Step-by-step explanation:

To convert from moles to grams, we must use the molar mass. This is found on the Periodic Table. Look for Phosphorous or P.

We can use this number as a ratio.

$(30.973762 \ g \ P )/(1 \ mol \ P)$

Multiply by the given number of grams: 15.62

$15.62 \ g \ P *(30.973762 \ g \ P )/(1 \ mol \ P)$

Flip the fraction so the grams of phosphorus cancel.

$15.62 \ g \ P *(1 \ mol \ P)/(30.973762 \ g \ P )$

$15.62 *(1 \ mol \ P)/(30.973762 )$

$(15.62 \ mol \ P)/(30.973762 )$

Divide.

$0.504297799 \ mol \ P$

The original measurement of grams has 4 significant figures, so our answer must have the same.

For the number we calculated, that is the ten thousandth place. The 9 in the hundredth thousandth place tells us to round the 2 to a 3.

$0.5043 \ mol \ P$

There are 0.5043 moles of phosphorus in 15.62 grams.