0
Elements, as listed on the Periodic Table have atomic numbers, whereas molecules, like water (H2O) have molecular weight, which is the sum of all of the atomic masses of the atoms in a molecule. Each of the components of H2O have an atomic number: Hydrogen has an atomic number of 1 (because it has 1 proton); Oxygen has an atomic number of 8 (it has 8 protons). So, if a person were to try to assign an atomic 'number' to H2O they would likely come up with 2 x 1 (for the 2Hydrogens) + 8 (for the Oxygen) = 10! Now, because an atomic 'number' indicates an element on the periodic table, we'd have to look at the periodic table...and find that 10 is Ne (Neon). As you can see, this would be completely wrong as water is NOT neon! So, water does not have an atomic number. It does, however have a molecular weight! The molecular weight of H2O can be calculated by referring to the periodic table, where we would find that Hydrogen has a weight of 1.0079 grams per mol and Oxygen has an atomic weight of 15.9994 grams per mol. The molecular weight of H2O can be calculated by figuring out how many of each atom is in the molecule, and then multiplying each by it's weight. So: Hydrogen has an atomic weight of 1.0079 and there are two of them in H2O: 1.0079 x 2 = 2.0158 grams per mole Oxygen has an atomic weight of 15.9994 and there is one in H20: 15.9994 x 1 = 15.9994 grams per mole Add them up! 2.0158 + 15.9994 = 18.0152 grams per mole H20 has a molecular 'weight' of 18.152 grams!
What else can I help you with?
How do you calculate the moles of water?
To calculate the moles of water, you can use the formula: moles = mass of water (in grams) / molar mass of water (about 18.015 g/mol). Simply divide the mass of water by its molar mass to find the number of moles.
A molecule of water is composed of two atoms of hydrogen and one atom of oxygen if the atomic mass number of hydrogen is 1 and the molecular mass of water is 18 the atomic mass of oxygen must be?
The molecular mass of water (H2O) is 18, which means the total mass of one oxygen atom and two hydrogen atoms is 18. Since the atomic mass number of hydrogen is 1, the atomic mass of oxygen can be calculated as 16 (18 - 2).
How do you calculate the mass in grams of 6.073 molecoles of water?
You divide the 6.073 by 6.022x1023 (avagadros number) to get the moles, then multiply by molecular mass (18) to get mass in grams
What is the atomic number for ice?
ice is solid form of water so doesn't have atomic number its atomic mass will be 18
Why does the volume of the water vapor increase and the mass remain constant When 1 gram of water is evaporated?
When 1 gram of water evaporates, its molecules gain energy to escape into the gas phase. The volume of water vapor increases due to the increased kinetic energy of the molecules, causing them to spread out more. However, the total mass remains constant because the number of water molecules in the system remains the same, only their arrangement changes.
What you the mass number of H2o?
The mass number of water (H2O) is calculated by summing the atomic masses of its components. Hydrogen has an atomic mass of 1 and oxygen has an atomic mass of 16. Therefore, the mass number of water is 18.
Does water have a mass of 18 grams?
It is water's molecular weight or mass number that equals 18 atomic mass units
How do you calculate the moles of water?
To calculate the moles of water, you can use the formula: moles = mass of water (in grams) / molar mass of water (about 18.015 g/mol). Simply divide the mass of water by its molar mass to find the number of moles.
When boiling water turns to steam what stays the same?
The mass of the water The number of molecules
What mass of water will contain 2.80 moles of water?
number of moles = Massdivided by Molar Mass 2.80 = Mass divided by 18.012.80 X 18.01 = MassMass = 50.43 grams.
How would you find out how much 12.4 moles of water weigh?
Multiply moles by molecular mass of water (18), gives you 223.8g. Remember this formula: Number of moles = mass / molecular mass
How many moles of water are in 0.34g of water?
To find the number of moles in 0.34g of water, you first need to calculate the molar mass of water, which is approximately 18g/mol. Then, divide the given mass by the molar mass to get the number of moles. Therefore, 0.34g / 18g/mol ≈ 0.019 moles of water.
How many moles of water were lost if the amount of water lost was 0.293 grams?
To find the number of moles of water lost, we first need to know the molar mass of water, which is approximately 18 g/mol. Then, we can use the formula moles = mass / molar mass to calculate the number of moles lost. In this case, 0.293 grams of water lost would be equivalent to approximately 0.016 moles.
A molecule of water is composed of two atoms of hydrogen and one atom of oxygen if the atomic mass number of hydrogen is 1 and the molecular mass of water is 18 the atomic mass of oxygen must be?
The molecular mass of water (H2O) is 18, which means the total mass of one oxygen atom and two hydrogen atoms is 18. Since the atomic mass number of hydrogen is 1, the atomic mass of oxygen can be calculated as 16 (18 - 2).
How do you calculate the mass in grams of 6.073 molecoles of water?
You divide the 6.073 by 6.022x1023 (avagadros number) to get the moles, then multiply by molecular mass (18) to get mass in grams
What is the theoretical percentage of water of hydration in cacl2-2h20?
1. Find the molar mass of the hydrate (Calcium Chloride Dihydrate).Find the molar mass of water and the anhydrate (anhydrate + water = hydrate); add the molar mass values of each to find the molar mass of the hydrate.Molar Mass CaCl2: 110.98g+ Molar Mass H2O: 36.04g*Molar Mass CaCl2 * 2H2O: 147.01gFinding Molar Mass# atoms element A * atomic mass element A = Mass A# atoms element B * atomic mass element B = Mass B... etc.Add up all the mass values and you have the value for molar mass. Do this for both the anhydrate and the water molecules. Add these values together to find the molar mass of the hydrate.Molar Mass Anhydrate + Molar Mass Water Molecules* = Molar Mass Hydrate* Tip: the molar mass of water for all hydrate calculations is 18.02g x number of water molecules. This number may be useful to remember on the day of the test or while doing practice problems.*2. Calculate the percentage of water in hydrate.Divide the molar mass of water by the molar mass of the hydrate, and multiply result by 100%.36.04g147.01g x 100%Percent water in hydrate is 24.52%.
1.000 mole of H2O corresponds to 0.05549g of H2O?
This information can help calculate the molar mass of water, which is 18 g/mol. By dividing the given mass of water by the number of moles, we get the molar mass.
