since the masses are in grams, and moelcular weight is in g/mol, if you divide the mass by molecular weight you get just moles. just make sure what you do to one side of the equation you do to the other. And then just manipulate the equation the same way you did...
(b)(i) Use the dat a in the table below to show, by calculating the numbers of moles,which reactant is in excess.(2)Substance Density/g cm3Molar mass/g mol-Ethanoic acid1.0560.1Propan-1-ol0.80460.1(ii)The mass of the ester collected was 35.0 g. Calculate the percentage yield of ...
Mole is an important concept used in chemistry. It represents the amount of molecule which has the exact mass of its gram molecular mass. One mole also contains an Avogadros number of molecules.Answer and Explanation: The number of moles can be calculated using following formulas- Using ...
To calculate the mass of air in a pressurized air tank, you can use the Ideal Gas Law, which is PV = nRT. Here, P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature. Rearrange the equation to solve for the number o...
There is no way that the weight can have 3 significant figures in the mass and then conjure 6 significant figures in the molecular weight. To make matters worse the pressure is only given to 1 significant figure. YUCK! Use PV = nRT to determine the moles of gas present. n=PVRT=0.1 ...
Then I use this to find the moles of acid present in solution; this is the part I am unsure about. I am assuming: because at the equivalence point half of the acid has been converted to it's conjugate base and so (2 mol NaOH=1 mol H2A2 mol NaOH=1 mol H2A). If thi...
Mass of sodium chloride: 0.481 g Moles of sodium chloride: 0.00823927 moles My Results I determined that the ratio is 1:1. So, 0.228 * 1 mol/ 84 g/mol = 0.0027 M Molecular weight of NaCl is 58 so, 0.0027 * 58 = 0.1574 This is where I got stuck. ...
If you purchase a primer or probe, it typically arrives in a tube as lyophilized powder, with a mass in picomoles (pmol—see list of units above), and needs reconstituting in a buffer prior to use. If you are struggling to calculate the req...
Molarity is probably the most commonly used unit of concentration. It is the number of moles of solute per liter of solution (not necessarily the same as the volume of solvent!). Example: What is themolarity of a solutionmade when water is added to 11 g CaCl2to make 100 mL of solution...
Based on this model, a method for calculating the molecular and energy parameters such as the hydration number, amount of moles of hydrate, amount of gas and water in it, its density and molar mass, and the energy and rate of hydrate formation was developed. A comparison of the calculated...