To determine the number of hydrogen atoms in 6.5 grams of water, you need to know the molecular formula of water, which is H2O. This means that every molecule of water contains two hydrogen atoms. To calculate the number of moles of water, divide the mass of water by the molar mass of water. The molar mass of water is approximately 18.01528 g/mol. So, dividing 6.5 grams by 18.01528 g/mol, we get approximately 0.361 moles of water. Since there are two hydrogen atoms in each water molecule, we can multiply the number of moles of water by two to find the number of moles of hydrogen atoms. Therefore, multiplying 0.361 moles by 2, we find that there are approximately 0.722 moles of hydrogen atoms in 6.5 grams of water.
