Question

Find the number of moles in 15 grams of H2O

Answer 1

0.83 moles

Step-by-step explanation:

The number of moles in 15 grams of water (H2O) can be calculated as follows:

First, we need to determine the molecular weight of H2O. It is composed of 2 hydrogen atoms (H) and 1 oxygen atom (O). The molecular weight of H2O can be calculated as follows:

(atomic weight of H x 2) + (atomic weight of O) = 2 x (1.01 g/mol) + 16.00 g/mol = 18.02 g/mol

Next, we can use the formula:

number of moles = mass / molecular weight

where mass is given as 15 grams.

number of moles = 15 g / 18.02 g/mol = 0.83 moles

Allen

Answer 2

Answer: 0.83 mole

Step-by-step explanation:

H2O has a gram-formula mass of 18 (hydrogen is 1 each, oxygen is 16).

If you have 15 grams, you have less than one mole.

15/18=0.83.

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Hope this helps.

MM4343