Calculating the Number of Molecules Present in a Sample

I need to calculate the number of molecules present in:
(a) 0.650 mol propane, C3H8, a gas used in laboratories
(b) a 500mg tablet of CaCO3, an antacid

Solution Preview

a.

There are 6.022x10^23 molecules of "chemical X" in a mole of "chemical X" (in this case "chemical X" is propane).

"Mole" is just a number.

you have 0.650 mol of propane times 6.022x10^23 molecules per mole

= 3.91x10^23 molecules

b.
For the next one, you need to convert ...

Solution Summary

The solution talks through the problem by way of explaining how to determine the number of molecules present in the two given samples.

... using the general formula for calculating moles giving ... in the problem can help us calculate the molecular... and the empirical formula was calculated by figuring ...

... 5. If you calculated a salt-tainted solution of about ... all the molar weights to get the number of grams ... 4. By percentage, we can calculate the percent amount of ...

... c. Calculate the pH of a saturated solution of Fe ... moles of CaCO3 in 25 grams = 0.25 Number of moles ... of HCl solution = 0.26*84.9375 = 22.08 g Molecular weight of ...

... Another method to find the grams of Y is to calculate: ... Since there are 3 Cl ions for every Al ion, the number of Al ... There are 8 molecules of AlCl3 in the sample...

...Calculate the mass percent of zinc in the sample of ... weight of NaCl= 58.44277 =(22.98977+35.453) Molecular weight of ... in the ratio of 1:x Let the number of moles ...

... From here we can calculate M for PCl5 in gaseous ... 208.32 g/mol) is equal to the calculated as M ... the pressure is directly proportional to the number of molecules...

... means that a certain number of water molecules are included ... as MgSO4 *xH2O, where x indicates the number of moles ... b. calculate the number of grams of CO that ...

Calculating Pressures using different laws. ... moles (n1) is actually 1.00mol and the final number of moles ... of 1.00mol of helium at 273K, and calculate the final ...

... of mole of Ar=34.8/40=0.87(mol) Total number of mole ... The volume can be calculated V=nRT/P=1.63*0.082*300/7.15 ... c. We can calculate the number of mole of O2: n=PV ...

... I have numbered the wells you indicated as 1, 2 ... The length you calculated from your agarose gel was 3785 ... This is because there are a number of variables between ...