How many moles are in 3.50 g of H2O? Answer in units of mole?
Molecular mass of H2O= 1x2+16=18 18 g H2O=1 mole 1 g H2O= 1/18 mole 3.50g H2O= {1/18 x (3.50)} mole = 0.194 mole
How many molecules are in 4.00 mol glucose, C6H12O6?
No matter what, if you have one mole of any monatomic particle (e.g. one mole of He), you always have 6.022 x 10^23 atoms per mole. Similarly, if you have one mole of any molecule (e.g. one mole of H2O), you have 6.022 x 10^23 molecules per mole. This number, 6.022 x 10^23 /mole , is known as the Avogadro Constant. So for 4.00 moles of glucose, you have 4 moles x 6.022 x 10^23 molecules/mole = 2.4088 x 10^24 molecules. Since 4.00 is considered to have three significant figures, you should round the answer to 2.41 x 10^24 molecules.
Chemistry: How many moles of H2O are in 5.8 g of AuCl3 · 2H2O?
Omg I like totally remember my Sophomore year in high school i had the worse Chemistry teacher well actually the first semester i was doing fine i had the best teacher in the world he was Brazilian but he left and i got this fat guy that would sweat all the time even when the classroom was freezing. No one really liked him, he really didn't teach us anything he spent the whole class period just yelling at people. I tried to work with what I had but soon I got tried of trying and not really understanding anything so I started just socializing with my friends and some how i survived that class with B's. I have no idea how i managed to pass that class everyone would just copy all the work from each other. Well now I really don't know any Chemistry what so ever.
How many moles of H2O are there in 58.8 g? How many molecules of H2O is that?
Calculate the molar mass of H2O by using the periodic table. You should get 18.02 g/mol. From there it's just watching your units to make sure they cancel. 58.8 g H2O * (1 mol H2O / 18.02g H2O ) = ? mol H2O Note how grams H2O cancels and you're left with mol H2O. Using Avogadro's number: 1 mole = 6.022 * 10^23 atoms/molecules/particles. Use this as your conversion factor. ? mol H2O * (6.022 * 10^ 23 molecules H2O / 1 mol H2O) = answer
HOW MANY MOLES OF H2O ARE THERE IN 100.0G OF H2O?
look at a periodic table. Below each element is an atomic weight. for instance, Carbon has an atomic mass of 12.011. A mole is definied as the number of atoms of Carbon-12 would weight 12 grams. this value is 6.023 x 10^23. This means that if u have 12 grams of Carbon-12, then you have 6.023x 10^23 atoms of Carbon-12. If u have 1 gram, then u have (6.023x10^23)/12 atoms of Carbon 12 How u can use this to determine the number of molecules in a certain mass is simple, but u need to know the chemical formula of the chemical. Let's say you have 1 gram of water. Water has the formula H20. The molar mass of Water is the sum of all the atoms, H has a molar mass of 1.01, and O has a molar mass of 16.00 H20 has two atoms of H and one of O, so multiply the mass of H by two and add the mass of O. H20 then, has a molar mass of 18.02g/mol. Since you have 1 gram of H2O, then you divide that by the molar mass to determine the number of moles of the substance you have. so: 1g/(18.02 g/mol)= .0555 mol. And you know 1 mol of Water has 6.02x10^23 molecules of water, so multiply .0555 mol by 6.02x10^23 and get 3.34x10^22 And so u know that in 1 gram of water, there are 3.34 x 10^23 number of molecules
No. of molecules= (No. of moles)*NANo. of moles= (Given mass)/GMMGiven mass= 3.7GMM of H2O= 18Hence,No. of moles= 3.7/18NA= 6.022*10^23so,No. of molecules= (3.7/18)*6.022*10^23
“How many molecules of H20 are in 3 mol of the substance?”You want the number of molecules “in” 3 moles of water?The answer is “3 moles of molecules”. “3 moles” is a number.It’s exactly the same as the number of chicken wings if you order “3 moles of chicken wings”. That’s a damn lot of wings, kimo sabe!This is like asking “how many donuts are in 3 dozen donuts?” It’s just three dozen, man! If you don’t want it in “dozens”, then you just multiply “three” by “dozen” (i.e., 12) and get 36.What I’m getting at is, this is super-simple, and a mole isn’t some mysterious measure of “stuff”, it’s just a number, that is also known as Avogadro’s number. It’s a number (like “dozen” = 12, but a lot bigger) and it has nothing more to do with molecules than it has to do with chicken wings. So if you don’t want the number in “moles” but rather in single things (such as molecules or chicken wings), just take that number (Avogadro’s number) and multiply it by 3:[math]6.022 \times 10^{23} \cdot 3 = 1.807 \times 10^{24}[/math]Cheers!
To work this out, you need the molar mass of water.An oxygen atom weighs 16 atomic units (au) and the two hydrogen atoms in water weigh 2 au. The molar mass of water is therefore 18 au. This means that 1 mole of water weighs 18 grams.1 mole = 18 gramsx moles = 6.5 gramsTherefore x = (6.5x1)/18 = 0.361 moles.1 mole contains 6.022141 x 10[math]^{23}[/math] particlesWe have 0.361 moles, so:0.361 x 6.022141 x 10[math]^{23}[/math] = 2.174 x 10[math]^{23}[/math] molecules.
How many moles are in 68.4 g of Al2(SO4)3?
Since the Molecular Weight of Aluminum Sulfate is 342.15 g/mol Then the number of moles in this sample = 68.4/342.15 = 0.2 moles approximately
Since there are approx 18 g of H2O in one mole if H2O and 135mg of H2O is .135g of H2O, the calculation is .135/18 gives you moles of H2O. Since there are two H atims per molecule you multiply the result by 2 to get the moles of H atoms in the sample…approx. 0.015 mols. You can use the actual molar mass of water to get a more exact answer instead of using 18 g/mol as a close estimate.