The molar mass of water (H2O) is 18.0 g/mol. A sample of water has a mass of 18.0 g. How many moles of water are contained in this sample? 1.00 18.0 36.0 324

1.00

Explanation:

Given that,

Amount of moles of H2O (n) = ?

Mass of H2O in grams = 18.0g

For Molar mass of water H2O, use the molar masses:

Hydrogen, H = 1g;

Oxygen, O = 16g

H2O = (1g x 2) + 16g

= 18.0g/mol

Since, amount of moles = mass in grams / molar mass

n = 18.0g / 18.0g/mol

n = 1.00 mole

Thus, there are 1.00 mole of water are contained in this sample

the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.

pie chart because it is in percents ( % )