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Answer :
To find the number of moles of hydrogen in 135 mg of H2O, convert the mass to grams and use the molar mass of water to determine the moles of water. Multiply this by 2 to find the moles of hydrogen, resulting in 0.01498 moles of hydrogen.
To determine how many moles of hydrogen (H) are present in 135 mg of H2O (water), first, we need to convert the mass of water from milligrams to grams. Since there are 1000 milligrams in a gram, 135 mg is the same as 0.135 grams. According to the periodic table, water has a molar mass of approximately 18.015 g/mol, which is the sum of the atomic masses of two hydrogen atoms (1.0079 g/mol each) and one oxygen atom (15.999 g/mol).
Next, we use the molar mass of water to convert from grams to moles:
The number of moles of H2O is calculated as 0.135 g \/ 18.015 g/mol = 0.00749 moles of H2O.
Since each molecule of water contains two hydrogen atoms, we multiply the number of moles of H2O by 2 to obtain the number of moles of hydrogen atoms: 0.00749 moles of H2O x 2 = 0.01498 moles of H.
Therefore, there are 0.01498 moles of hydrogen in 135 mg of water.
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