Multiply the mass of the compound by the conversion factor based on the percent composition of the element in the compound
Use a Periodic Table to find the molar mass of the element (the Atomic Mass=the molar mass). The molar mass = the number of grams of an element that contains 6.022•1022 atoms of the element. The reciprocal of the molar mass times 6.022•1022 equals the number of atoms in the sample.
Conversion of the grams(g) into moles(mol) is easy.
Example: 126 g of Li2So4 contains ______ moles.
When you calculate - 110 g =1 mol of Li2So4
Then 126 g contains = 1.146 mol
The periodic table of elements gives a gram molecular weight for each element, which tells you the number of grams that a mole of that element weighs. So, for an element you can look up that answer immediately; for a compound, you just determine the gram molecular weight of each element that is present in that compound, and multiply by the number of atoms of that element per molecule. Note that the weight of an element is NOT simply determined by the atomic weight. Atomic weight only applies to a specific isotope, but elements as they are found in nature are always a mixture of isotopes. So, the gram molecular weight tells you what the element actually weighs, based upon the normal isotope distribution.
I am having trouble with this and am hoping someone can help me better understand with a simple step by step.Here's an exampleA BaseballMass measurement 1 .145kgMass measurement 2 145.05gMass measuremnet 3 145,750.77mgMass Average ??? gConvert ??? kg
1kg = 1000g
conversion factors are 1kg/1000g = 1000g/1kg = 1
1g = 1000mg
conversion factors are 1g/1000mg = 1000mg/1g = 1
1. Convert 0.145kg to g using the conversion factor than cancels kg (kg will be on the bottom).
0.145kg x (1000g/1kg) = 145g
2. Convert 145,750.77mg to g using the conversion factor that cancels mg (mg will be on the bottom).
145,750.77mg x (1g/1000mg) = 145.75077g
3. Determine mass average in grams.
(145g + 145.05g + 145.75077g)/3 = 435g/3 = 145g *Due to significant figures, when adding measurements, the answer is rounded to the least number of decimal places used in the calculation.
You find the atomic mass of an element by summing up the masses of the protons and neutrons since electrons masses are way too small.
u look it up on answers.com
But for real: add the number of protons (the atomic number) to the number of neutrons
atoms= moles*6.02x10^23
number of moles = mass of the material/molar mass
Conversion of a certain mass of a substance to moles requires knowing the molar mass. Molar mass is given in grams per mole. Dividing the known mass by the molar mass gives the number of moles.
25.0 grams Na2SO4 ( only way this compound is possible ) 25.0 grams Na2SO4 (1 mole Na2SO4/142.05 grams) = 0.176 moles Na2SO4 -----------------------------
This depends on the compound.
Since both of them are per liter....then all you need to do is a one step conversion of moles into grams using the molar mass...essentially you are going to multiply the mol/L by the molar mass in grams of the given substance...
Multiply the number of moles by the molecular weight of the compound (or atomic weight for an element) to find the mass in grams.
number of moles = mass of the material/molar mass
How many MOLES of sodium nitrate are present in 2.85 grams of this compound ?
To find the number of moles in 57 grams of Xenon, divide the given mass (in grams) by the molar mass of Xenon. The molar mass of Xenon is 131.3 grams/mol. Therefore, 57 grams of Xenon is equal to 0.434 moles (57/131.3).
The molar mass of a compound is expressed in grams.
1 mol is equivalent to the molar mass of a compound, in grams.
Assume the compound has a molar mass of 100 grams, from the information given, 32.2 grams is Calcium and 67.8 grams is Nitrogen.You then find the moles of each, which would be moles of Ca and moles of N.Dividing the two moles gives you the mole fraction: which we approximate to 6. This means that for every 1 mole of Ca, there are 6 moles of N, thus the answer is
This depends on the compound.
2,55 moles of the compound CO have 71,4 grams.
To find the mass, we divide by Avogadro's number to find the amount of moles. We then multiply the moles by the molar mass of the compound which is 60.08 grams. Doing all of this, we get a mass in grams of 5.59 grams.
all you have to do to fine the moles of any element is divide the given grams by the molar mass (which you can find on a periodic table of elements) Likewise, if you need to find the grams, just multiply the number of moles by molar mass. moles = grams/molar mass grams = moles x molar mass your equation should look like this: moles = 89.0 / 17.0 moles = .471
Conversion of a certain mass of a substance to moles requires knowing the molar mass. Molar mass is given in grams per mole. Dividing the known mass by the molar mass gives the number of moles.