Chemistry. Can anyone tell me how to get from moles to grams, step by step? Example: 3.50 moles of Au (gold) to grams.?
Heres the formula n=m / M n=no. of moles m=mass M= molecular/atomic mass example grams in 3.5moles of Au? DATA n=3.5 M=197 SOLUTION n= m / M xM both sides n x M = Mx m/M cancel M/M n x M = m (mass) mass= 3.5 x 197 mass = 689.5 grams
Chemistry Question? Help?
in case you're pertaining to your self, and besides the fact that in case you're no longer, of direction. something is conceivable. I even have an exceedingly demanding time information math and Chemistry. To the factor that frequently I easily think of it is impossible for me to appreciate. in case you physique of techniques it with an open techniques and discover the perfect guy or woman to describe it although, it helps lots. one among my subjects with math... Algebra specifically.... I even have had 3 distinctive instructors clarify something to me, the comparable ingredient, slope and stuff. i did no longer are conscious of it in any respect. A 4th instructor got here visiting although, and he or she became waiting to describe it fantastically lots and that i understand rather are conscious of it, and while/if a lesson starts managing it returned, with a dash help i've got self belief i visit be waiting to do it. only because of the fact somebody has a low IQ or would not understand something does no longer mean they could't do particular issues. The techniques is a muscle, and you could constantly workout it to make stronger it. A low IQ potential a nasty understanding set and information (i do no longer understand precisely what IQ tests degree...) each little thing on the tests could be discovered although. you're no longer born understanding the wisest ingredient of do specifically circumstances, you in common terms learn that. some human beings save their minds closed and don't learn understanding and sensual understanding. somebody is likewise no longer born understanding Algebra. that's something you may learn. Even those with getting to grasp disabilities are waiting to income by way of time and attempt. it is all a count of how lots attempt you're keen to furnish :) flow to the Khan Academy internet site. Khan is mind-blowing :)
In chemistry, why do we have to convert Liters, to moles, to grams, instead of just doing a one-step conversion (liters to grams)?
By itself, liters to grams is pretty meaningless. Liters is a unit of volume and grams is a unit of weight. There’s no meaningful way to compare them. However, in science liters and grams would have some sort of context. If I have a 1 L solution of something it would be handy to know how much of whatever I’ve got is in that solution. Did you add 100g of sugar to 1 L of water? Then you have 100g/L which is a perfectly fine unit of measurement for concentration. But if you wanted to do a more sophisticated reaction, you might need to know exactly how many molecules (or at least the ratio) of sugar you just added to your water. TO do that you’d need to convert your grams of sugar into moles. In this way you can compare the number of sugar molecules with another reactant. This also gives you Molarity which is moles per liter. Which is also a really handy measure of concentration. You can do these conversions in any order depending on the context of the problem you’re working on and the units you need.
What is a mole in chemistry?
The mole is the unit of measurement in the International System of Units (SI) for amount of substance. It is defined as the amount of a chemical substance that contains as many elementary entities, e.g., atoms, molecules, ions, electrons, or photons, as there are atoms in 12 grams of carbon-12 (12C), the isotope of carbon with relative atomic mass12 by definition. This number is expressed by the Avogadro constant, which has a value of 6.022140857(74)×10[math]^{23}[/math] mol−1. The mole is one of the base units of the SI, and has the unit symbol mol.Think of moles as a "chemist's dozen". Just as 12 eggs is a dozen eggs, 6.02 × 10[math]^{23}[/math] eggs is a mole of eggs. 6.02 × 10[math]^{23}[/math]molecules of oxygen is a mole of oxygen.The number of grams in a mole is different from substance to substance. If you're like most students, it's this that's confusing you. Picture it this way: a dozen elephants have a different weight than a dozen rabbits- but in each case, you have a dozen animals. Similarly, a mole of oxygen gas has a different weight than a mole of water- but in each case, you have 6.02×10[math]^{23}[/math] molecules.Why use moles? You often want to know how many molecules you have in a sample of a substance. Counting the molecules individually would be completely impractical. Even if you had a way to see the individual molecules, there are just too many, even in a tiny sample. Moles were defined to solve the problem of counting large numbers of molecules. With moles, you count the number of molecules in the sample by weighing it.bigAuthor: Fred Senese senese@antoine.frostburg.edu
How do you convert moles to grams, and grams to moles?
The molar mass of H2O is 18.01528g/mol Since you know the number of moles we will simply multiply the two numbers Solution 1.9 mol * 18.01528g / mol = 34.229032 g The unit mol is canceled out of 1.9 and 18... leaving you with the unit grams. In order to convert from gram to moles you divide the number of moles by the molar mass Lets say you have 2g of lithium Its molar mass is 6.941 g/mol 2g * mol / 6.941g = .... the unit grams would cancel out always make sure that the unit with which you want to finish with is at the top.
Chemistry questions I really need help with! (Stoichiometry)?
I can answer the first question for you just to get you started... By 4.2, I assume you mean 4.2 grams. Step 1: figure out the balanced chemical equation of the reaction. C2H5OH + 3O2 --> 2CO2 + 3H2O (you might have learned this in the types of reactions unit which chemistry classes teach previously to learning stoichiometry) Step 2: Find molar mass of Ethanol. molar mass of Ethanol = 2(12)+5(1)+1(16)+1(1) = 46g/mol (I basically used the periodic table to add up all the molar masses according to # of atoms in the compound) Step 3: convert mass of 4.2 g Ethanol to moles. number of moles = mass/molar mass = 4.2g/46g/mol = 0.913 mol Step 4: Multiply moles of Ethanol according to the ratio that we discovered in step 1. 0.913 mol Ethanol X (1 mol Ethanol/3 mol H2O) = 0.0304 mol H2O
How do you convert molecules to grams?
Each atom has a different mass, hence weight, but the atom masses are really small, so small that we have to speak of how much weight not one atom but severaal trillions.Is like if a farmer does not have a scale to weight less than one pound accuratelly and he decides not to speak about how much an egg weights, but how much ten dozens weight. He's got eggs of 8 pounds and eggs of 6 pounds, two different categories of eggs ( but 6 pounds is what 120 eggs weight, not one egg). 12o eggs is something that our farmer is used to call "one mouls of eggs", but sometimes he uses the expression " three moults of potatoes" and he means 360 potatoes.Chemist are used to talk about one mol of carbon atoms, they do not mean 120 atoms, but 6,23 *10^23 atoms.One mol of atoms of carbon weight indeed 12 grams. But one mol of atoms of Hidrogen weight one gramm. And one mol of molecules of Hidrogens weight two gramms because each molecule bears two atoms H2.That's why chemist say the atomic mass (or weight) of carbon is 12 (because one mol of atoms of carbon weights 12 grams). Now think this aloud with me: what is the molecular weight of carbon dioxide?First you need to know FORMULATION, that means that if I told you carbon dioxide you have to write CO2. Then one mol of CO2 wears one mol of carbon but two moles of Oxigen (atomic mass of oxigen is 16 grams, so one molof oxigen weights 16 grmas).C 12*1 = 12O2 16*2 = 32---------------------CO2 = 44 grms /molNow the last one, calculate the molecular weight of sulfuric acid. First Formulation, you have t know that sulfuric acid is H2 SO4. And then the calculations:H2 1 * 2 = 2S 32*1 = 32O4 16*4 = 64------------------------------H2 SO4 = 98 grms /molI have done so many problems that I remember the atomic masses of a dozen of most common atoms,, but there's a TABLE called The Periodic Table of the Elements, where you can find the atomic masses plus way a lot more of data about all elements.That's all ¡¡¡
How do you convert molecules to grams?
Each atom has a different mass, hence weight, but the atom masses are really small, so small that we have to speak of how much weight not one atom but severaal trillions.Is like if a farmer does not have a scale to weight less than one pound accuratelly and he decides not to speak about how much an egg weights, but how much ten dozens weight. He's got eggs of 8 pounds and eggs of 6 pounds, two different categories of eggs ( but 6 pounds is what 120 eggs weight, not one egg). 12o eggs is something that our farmer is used to call "one mouls of eggs", but sometimes he uses the expression " three moults of potatoes" and he means 360 potatoes.Chemist are used to talk about one mol of carbon atoms, they do not mean 120 atoms, but 6,23 *10^23 atoms.One mol of atoms of carbon weight indeed 12 grams. But one mol of atoms of Hidrogen weight one gramm. And one mol of molecules of Hidrogens weight two gramms because each molecule bears two atoms H2.That's why chemist say the atomic mass (or weight) of carbon is 12 (because one mol of atoms of carbon weights 12 grams). Now think this aloud with me: what is the molecular weight of carbon dioxide?First you need to know FORMULATION, that means that if I told you carbon dioxide you have to write CO2. Then one mol of CO2 wears one mol of carbon but two moles of Oxigen (atomic mass of oxigen is 16 grams, so one molof oxigen weights 16 grmas).C 12*1 = 12O2 16*2 = 32---------------------CO2 = 44 grms /molNow the last one, calculate the molecular weight of sulfuric acid. First Formulation, you have t know that sulfuric acid is H2 SO4. And then the calculations:H2 1 * 2 = 2S 32*1 = 32O4 16*4 = 64------------------------------H2 SO4 = 98 grms /molI have done so many problems that I remember the atomic masses of a dozen of most common atoms,, but there's a TABLE called The Periodic Table of the Elements, where you can find the atomic masses plus way a lot more of data about all elements.That's all ¡¡¡
Empirical formula chemistry help?
http://www.kentchemistry.com/links/bondi... See walkthrough video Step 1 If you have %. Assume the mass to be 100g, so the % becomes grams. Step 2 Determine the moles of each element. Step 3 Determine the mole ratio by dividing each elements number of moles by the smallest value from step 2. Step 4 Double, triple … to get an integer is they are not all whole numbers
Chemistry questions I really need help with! (Stoichiometry)?
I can answer the first question for you just to get you started... By 4.2, I assume you mean 4.2 grams. Step 1: figure out the balanced chemical equation of the reaction. C2H5OH + 3O2 --> 2CO2 + 3H2O (you might have learned this in the types of reactions unit which chemistry classes teach previously to learning stoichiometry) Step 2: Find molar mass of Ethanol. molar mass of Ethanol = 2(12)+5(1)+1(16)+1(1) = 46g/mol (I basically used the periodic table to add up all the molar masses according to # of atoms in the compound) Step 3: convert mass of 4.2 g Ethanol to moles. number of moles = mass/molar mass = 4.2g/46g/mol = 0.913 mol Step 4: Multiply moles of Ethanol according to the ratio that we discovered in step 1. 0.913 mol Ethanol X (1 mol Ethanol/3 mol H2O) = 0.0304 mol H2O