Q25 of 55 Page 5

What is the symbol for SI unit of mole? How is the mole defined?

The SI unit for mole is mol. The mole is defined as the amount of substance of a system, which contains as many elementary entities as there are atoms in 0.012 kilogram or 12 gram of carbon-12; the entities can be atoms, molecules, electrons and so on.


More from this chapter

All 55 →
35

The reactant which is entirely consumed in reaction is known as limiting reagent. In the reaction 2A + 4B → 3C + 4D, when 5 moles of A react with 6 moles of B, then

(i) which is the limiting reagent?


B. calculate the amount of C formed?


 24

How many significant figures should be present in the answer of the following calculations?


 27

Calculate the mass percent of calcium, phosphorus and oxygen in calcium phosphate Ca3→PO4)2.

 36

Match the following: