How many molecules are in 240.0 grams of cobalt (ii) chloride, cocl2

Avagadros number states that 1 mol of any substance is made of 6.022 x 10^23 units

These units could be atoms making up elements or molecules making up compounds

Therefore 1 mol of CoCl2 is Made of 6.022 x 10^23 molecules of CoCl2

Molar mass of CoCl2 is 130 g/mol

Therefore 1 mol of CoCl2 weighs 130 g

So 130 g of CoCl2 contains 6.022 x 10^23 Molecules of CoCl2

Then 240 g of CoCl2 contains - 6.022 x 10^23 / 130 g x 240 g = 1.11 x 10^24 molecules of CoCl2

Answer is 1.11 x 10^24 molecules of CoCl2

The molecules that are in 240 grams of cobalt(ii) chloride COC2 is 1.112 x10^24 molecules

calculation

find the number of moles = mass/molar mass\

molar mass of CoCl2 = 58.9 + 35.5 x2 = 129.9 g/mol

moles= 240g/129.9 g/mol =1.8476 moles

by use of Avogadro's constant

that is 1 mole= 6.02 x10^23 molecules

1.8476 moles=? molecules

by cross multiplication

1.8476 moles x 6.02 x10^23 molecules/ 1moles =1.112 x10^24 molecules

< > according to newton's third law of motion, forces always act in equal but opposite pairs. another way of saying this is for every action, there is an equal but opposite reaction.< >

the answer is 0.8m.

by: nicholas