How do you tell the number of moles in a compound if given the number of grams?

Answer 1

Multiply the mass of the compound by the conversion factor based on the percent composition of the element in the compound

Answer 2

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.

Answer 3

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

Answer 4

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.

Answer 5

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.

Answer 6

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.

Answer 7

u look it up on answers.com

But for real: add the number of protons (the atomic number) to the number of neutrons

Answer 8

atoms= moles*6.02x10^23