249.72 g/mol
mass = moles x relative molecular mass
mass = 5 x (2+16)
mass = 5 x 18
mass = 90g
while n= number of moles; m= mass; <and> M= molar mass; the mass of 5.0 mol H2O is:
m = n x M
= 5 x [(H x 2) + (O x 1)]
= 5 x [(1 x 2) + (16 x 1)]
= 5 x (2+16)
= 5 x 18
= 90
.: the mass of 5.0 mol H2O is 90g
The mass in grams of 3 moles of water molecules is 48 g.
5.0 mol × (18.0 g/mol) = 90. grams H2O
This mass is 56 g for H2O.
This mass is 54 g.
This mass is 54 g,
90g
The formula of water is H2O and that of oxygen molecules is O2. The fraction by mass of oxygen in water is the atomic mass of oxygen divided by the molecular mass of water, which in turn is the sum of the atomic mass of oxygen and twice the atomic mass of hydrogen, or {15.999/[15.999 + 2(1.008)]} = 0.888, to sufficient significant digits to correspond to the problem information of 52.8 grams of water. The mass of oxygen in this amount of water therefore is 0.888 X 52.8 = 46.9 grams. The molecular mass of oxygen atoms is 2 X 15.999 = 32.0, so that 46.9 grams corresponds to 46.9/32.0 = 1.466 moles of oxygen molecules. The number of molecules per mole of any substance is Avogadro's number, 6.022 X 1023. The answer to the problem is this number multiplied by the number of moles = 1.466 X 6.022 X 1023 = 8.83 X 1023.
The molar mass of S8 is 256.52. 0.5 moles of S8 has a mass of 128.26 grams.
You don't need to use Avogadro's number, you need the mass of the molecule in atomic units. Mass / molecular mass = moles eg for water, 36 grams / 18 atomic units = 2 moles
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
Mass in grams = no of moles x molecular mass. So, mass in grams = 5.2x 56 = 291.2g
How many molecules are in 94 grams of sodium fluoride
1 mole equals 6.022 x 10 to the 23 molecules
For this you need the atomic (molecular) mass of H2O. Take the number of grams and divide it by the atomic mass. Multiply by one mole for units to cancel. H2O= 18.0 grams.417 grams H2O / (18.0 grams) = .0232 moles H2O
first you divide by avagadro's number to get the number of moles. 3.41x10^26 / 6.022x10^23 = 566.25 moles The molecular mass of water is 18. moles is mass/molecular weight so moles by the mass is the weight. 566.25*18 is 10192.63g. This is 10.193kg. Are you sure your molecule count was not exponentially lower?
To find the mass, we divide by Avogadro's number to find the amount of moles. We then multiply the moles by the molar mass of the compound which is 60.08 grams. Doing all of this, we get a mass in grams of 5.59 grams.
To find the mass, we divide by Avogadro's number to find the amount of moles. We then multiply the moles by the molar mass of the compound which is 60.08 grams. Doing all of this, we get a mass in grams of 5.59 grams.
For this you need the atomic (molecular) mass of H2O. Take the number of grams and divide it by the atomic mass. Multiply by one mole for units to cancel. H2O=18.0 grams235 grams H2O / (18.0 grams) = 13.1 moles H2O
1100 Grams
For this you need the atomic mass of Al. Take the number of grams and divide it by the atomic mass. Multiply by one mole for units to cancel.54.0 grams Al / (27.0 grams) = 2.00 moles Al
number of moles = Massdivided by Molar Mass 2.80 = Mass divided by 18.012.80 X 18.01 = MassMass = 50.43 grams.
Use the formula:Number of molecules ÷ Avogadro's constant = Number of moles of molecules(7.99 × 1033 molecules) ÷ (6.02 × 1023) = 1.33 × 1010 moles of AgI moleculesIn case you need the mass in grams and not in moles, then you need to do a mole → gram conversion. To do this you need the molecular mass of AgI, so add up the atomic weights of the elements involved.Silver = 107.9 gramsIodine = 126.9 grams---------------------------Silver iodide = 234.8 gramsNumber of moles × molecular mass = grams(1.33 × 1010 moles) × 234.8 grams = 3.12 × 1012 grams AgI
45 grams, since the atomic mass of water is 18g.18 * 2.5 = 45