There are four molecules of water in 4H2O. One molecule of water is written as H2O. The subscript 2 tells you that there are two H(hydrogen) atoms. Since there is no subscript after the O there is one O(oxygen) atom.
Now back to 4H2O. The coefficient 4 tells you there are four molecules of H2O. Therefore there are eight H(hydrogen) atoms and four O(oxygen) atoms.
First of all, there are 4 molecules of water since H2O is the formula of water
And when we come specifically, there are eight molecules of hydrogen and four molecules of oxygen. I've done this by multiplying the
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
4.50 grams H2O / 18.0 grams = .250 moles H2O
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
4.50 grams H2O / (18.0 grams) =.25 moles H2O
There are 6.022 E23 molecules in each mole of a substance. Then 4.5 moles of H2O has 2.71 E24 molecules of water.
Water has a molar mass of 18.0153 grams per mol, so there are .25 moles of water. Using Avogadro's constant, there are then 1.51 E23 molecules of water.
Avogadro's Number is the number of molecules in one mole (6.022 x 10^23)
So take it 4 times as big: 24.088 x 10^23 = 2.4 x 1023 molecules. But how do you imagine how many they are?
Since the coefficient refers to the amount of moles, there are 4 x 6.02x10^23 or 24.08 x 10^23 molecules represented by 4H2O
00000.34256 moles in 4.50g of H20
How many hydrogens are in 4H2O?
Since moles = mass/molar mass then the number of moles is 40.0/(1+1+16) = 2.22mol to 3sf
NaHCO3 ----> H2O Mass 2.10g 0.045g RAM 84 g/moles 18 g/moles number of moles 0.025moles 0.025moles
Since the molar mass (grams per mole) of H2O is 18.02, the grams of H2O in 4 moles is 72.08g.
45 grams, since the atomic mass of water is 18g.18 * 2.5 = 45
301.8g H2O
1.54 moles H2O (18.016 grams/1 mol H2O ) =27.7 grams
The answer is 0,44 moles.
For this you need the atomic (molecular) mass of H2O. Take the number of moles and multiply it by the atomic mass. Divide by one mole for units to cancel. H2O= 18.0 grams2.5 moles H2O × (18.0 grams) = 45.0 grams H2O
1 mole is equal to 18 grams of H2O, so 60 grams is 3.33 moles.
Since moles = mass/molar mass then the number of moles is 40.0/(1+1+16) = 2.22mol to 3sf
.037g x 1 mole of H2O / 18.02g H2O= .00205 moles H20 this is a simple factor label problem in which you multiply the number of grams by the number of grams per mole. Thus, the GRAMS cancel and you are left with moles. 18.02 is the molecular weight of H2O; 1.01+1.01+16= 18.02 g/mol
53 grams ÷ 18.01 grams/mole = 2.94 moles
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
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 grams500.0 grams H2O / (18.0 grams) = 27.8 moles H2O
To teach you how to do this problem: 1. Look at the Periodic Table. O =16 grams/mole, H =1.01 grams/mole 2. Calculate the Molecular Weight of Water. 1*O + 2*H: 16+2.02=18.02g/mole 3. Divide the mass of what you have by the Molecular Weight: 35.1g H2O/(18.02 g H2O/mole H2O) 4. The units g H2O cancel leaving you with mole H2O. 5. 35.1 grams H2O= 1.95 moles H2O
Suppose you have 1g of H2O and you want to convert that to moles. You multiply 1g by the inverse of molar mass to get the moles of H2O: 1g H2O *(1mol H2O/18g H2O)= 0.56 moles of H2O in 1g of H2O. You get 18g = 2(1.008)+1(16.00).
2.08 moles H2O (2 moles H/1 mole H2O)(1.008 grams H/1 mole H) = 4.19 grams of hydrogen ===================