Advertisements
Advertisements
Question
How many moles are there in 34.5 g of sodium ? (Atomic mass of Na = 23 u)
Advertisements
Solution
Mass of zinc = 10g
gram atomic mass of zinc = 65g
We know that one mole of zinc contains 6.022 × 1023 atoms of zinc.
65g of zinc contain = 6.022 × 1023 atoms
Therefore, 10g of zinc contain = 10 × 6.022 × 1023/65 = 9.264 × 1022 atoms
Hence, 10 grams of zinc contain 9.264 × 1022 atoms.
APPEARS IN
RELATED QUESTIONS
If one mole of carbon atoms weighs 12 gram, what is the mass (in gram) of 1 atom of carbon?
One of the following elements has an atomicity of ‘one’. This element is :
If the aluminium salt of an anion X is Al2X3, what is the valency of X ? What will be the formula of the magnesium salt of X ?
What is a group of 6.022 × 1023 particles known as ?
Fill in the following blanks :
0.5 mole of calcium element has a mass of ............... .
Calculate the mole ratio of 240 g of calcium and 240 g of magnesium. (Ca = 40 u ; Mg = 24 u)
What weight of each element is present in 1.5 moles of sodium sulphite, Na2SO3 ?
(Atomic masses : Na = 23 u ; S = 32 u ; O = 16 u)
The relative atomic mass of Cl atom is 35.5 a.m.u. Explain this statement.
How many grams are there in the following?
4 moles of the phosphorous molecule, P4
If 0.2 mol of the following substance is required how many grams of that substance should be taken?
Calcium carbonate
