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Ex: Calculate mass percent of Hydrogen and oxygen in 72g " of HzO. (H= 1 g/mol and O= 16 g/mol)Mol Hz0 = mass HzO/molar mass HzO = 72/18= 4 mol...

Question

Ex: Calculate mass percent of Hydrogen and oxygen in 72g " of HzO. (H= 1 g/mol and O= 16 g/mol)Mol Hz0 = mass HzO/molar mass HzO = 72/18= 4 mol

Ex: Calculate mass percent of Hydrogen and oxygen in 72g " of HzO. (H= 1 g/mol and O= 16 g/mol) Mol Hz0 = mass HzO/molar mass HzO = 72/18= 4 mol



Answers

Calculate the mass percent of hydrogen in water and the mass percent of
oxygen in water.

The the explanation off. The answer is dead toe. Calculate the mass percent off the hydrogen in the water. We know that the mouth off water is 18.2 grand per month. The mask off two hydrogen atoms is 2.0. To grab Permal, the mosque off one oxygen atom is 16.0 ground for more. Therefore, divide the mass off both atoms by the total mass off the water and then multiply by 100 toe. Find the mass percent. So here we come on the calculation that is the mosque percent off heroin is 2.2 Graham Permal, divided by 18 point zero to cramp or more multiplied by hundreds. And here we get this 11% and to calculate the mass percent off oxygen. Here we divide 16.0 graham off mall divided by 18 points, Ruto gram per month multiplied by hundreds. And here we get a mass percent off. Oxygen is 89 percent. Thus, the percent off the hydrogen is 11% and the percent off oxygen is 89%. This is valid because both percentages add up to hundreds. So this was a complete solution. Off the answer. Step by. Step in the tape. Please go through this. Thank you.

Right. So this problem we know we have a kilogram of oxygen and kilogram applied ridin, and our goal is to make water. We know that, um, 16 grams of oxygen and, um, two grams of hydrogen is needed to make one water molecule, so, you know, a lot more oxygen. Then we dio hydrogen, and so we're definitely gonna run out of oxygen first. Um and so so, yeah, we're gonna run out of oxygen first, and we're gonna use all the hydrogen. Um, or if I we're gonna use, um we're gonna use all of the oxygen, and so we're gonna have hydrogen left over. And so, um, who want to figure out how much water we made? So if we use all of the oxygen that we're using, um, 1000 grams of oxygen and then we know that we need So for every 16 grams of oxygen we need, we need to grams of hydrogen. So we need eight times more oxygen than we do hydrogen. And so, um, we need 1000 grams divided by eight. Um, f hydrogen. So let's see what 2000 divided by 8000 divided by two is 500 divided by four. No, I don't think I should know this. It is not coming to me. 125 0 yeah, Because 100 of one of my eight is 12.5. Okay, so, um, so we're gonna use up 125 grams of hydrogen, and so then the total amount is, uh, of water is going to be 11 25 grams of water, just adding this plus this. And, um and we want to know how much, um, hydrogen is left over. And so we had 1000 grams of hydrogen, and we're only using 1 25 So that means 8 75 1000 minus 1 25 which is 8 75 grams of hydrogen left. And what else got that high water mark o. And we want it. And moles. Um, so So there's Let's see. So we know that, um, we're using 1000 grams of oxygen, and we know that it's 16 grams per mole. And so we want to divide by 16 to get the mole amount of moles of oxygen. So 1000 divided by 16 grams per mole of oxygen, and then we want to do the same thing for hydrogen is who we're going to use 1 25 grams and then we know that for hydrogen, it's, um, two moles per or 11 gram, one mole program, because it's saying two moles of hydrogen. Um, it's needed. And so, yeah, it's one gram promote. You can also look it up on the periodic table. So one gram per, um also know math needed to be done. There's just 1 25 um, and so we can say that it's the amount of water, and Ingram's is this, but we need to find it the mountain moles. So we're going to do 1000 divided by 16 just 62.5. And we want to add that to the 1 25 moles of, um, hydrogen. And so that's gonna be at 1 87.5 moles of water. Oh, wait a second. That's not right, because you used to hydrogen ins. So, um, I'll do it a slightly different way. Um, you know that one that that water is, um, one mole of oxygen, two moles of hydrogen. And so it's going in the total mass of, um, one water molecule or the massive we know we can completely use a baller model are water. And, um, sorry all of our oxygen and hydrogen. Um, if if there's 16 grams of oxygen and two grams of hydrogen and so we know that water has a molar mass of 18 grams per mole, All of that is just to say at that 18 grams for more for water, so we can do 11 25 grams, divided by 18 grams per mole. And then we get, um 11. 25 divided by 18 62.5 moles of water.

This is a pretty straightforward calculation. We know the moles of 02 So if we multiply the moles of 02 by its smaller math, the moles 02 will cancel and we'll end up with grams 0 to 81.6 grams 02

So this question kind of seemed like some circular reasoning because the definition of molar mass is almost built into the name. It is the mass of one mole of Adam. So if you could get one mole of atoms, which would be avocados, number of atoms and put it on a scale that would give you the mass of one mole of Adams.


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