Mole ConceptMedium
Question
1021 molecules are removed from 200mg of CO2. The moles of CO2 left are :
Options
A.2.88 × 10-3
B.28.8 × 10-3
C.288 × 10-3
D.28.8 × 103
Solution
No. of moles = 
no. of moles in 200mg =
= 4.5 × 10-3 moles
No.of moles in 1021 molecules
= 1.67 × 10-3 moles
No. of moles left = (4.5 - 1.67) × 10-3
= 2.88 × 10-3
no. of moles in 200mg =
= 4.5 × 10-3 molesNo.of moles in 1021 molecules
= 1.67 × 10-3 molesNo. of moles left = (4.5 - 1.67) × 10-3
= 2.88 × 10-3
Create a free account to view solution
View Solution FreeMore Mole Concept Questions
In potash alum, the ratio of $K^{+}$and ${SO}_{4}^{2 -}$ ions is...A compound of iron and chlorine is soluble in water. An excess of silver nitrate was added to precipitate all chloride i...A compound contains 7 carbon atoms, 2 oxygen atoms and 9.96 × 10–24 g of other elements. The molecular mass of compound ...Calculate the N−N bond energy in N2H4 from given data.εN-H = 393 kJ/moleεH-H = 436 kJ/moleᐃHvap[N2...1M 100 ml NaCl is mixed with 3M 100 ml HCl solution and 1M 200 ml CaCl2 solution. Find the ratio of the concentration of...