Question Text
Question 1 :
The molecular mass of $(NH_2)_2CO$ is :(Given atomic mass of H = 1, O = 16, C = 12, N = 14.)<br/>
Question 2 :
Assertion: 23 g of sodium has $6.022 \times 10^{23}$ atoms sodium.
Reason: Number of atoms in the given mass of sodium cannot be determined
Question 8 :
2 moles of chlorine atoms are present in_____g of chlorine gas.
Question 9 :
What is the mass in grams of 3 moles of $N_2$?
Question 11 :
What is the molecular weight of$\displaystyle HCl{ O }_{ 4 }$?
Question 13 :
How many atoms are represented in$\displaystyle { Na }_{ 2 }{ CO }_{ 3 }\cdot 10{ H }_{ 2 }O$
Question 14 :
How many atoms do make a piece of aluminium foil which has mass of 27 grams?
Question 15 :
The relative formula mass, $M_{r}$, of calcium carbonate, $CaCO_{3}$, is $100$. What is the mass of carbon present in $100\ g$ of calcium carbonate?
Question 17 :
Which quantity is needed to relate moles with the number of atoms?
Question 18 :
Which of the following expressions is correct ? ($n$ = number of moles of the gas, $N_A$ = Avogadro constant. $m$ = mass of 1 molecule of the gas. $N$ = number of molecules of the gas) 
Question 19 :
The atomicity of a species is $x$ and its atomic weight is $y$. The molecular weight of the species is:<br/>
Question 20 :
Assertion: 1 mole $H_2SO_4$ contains same mass of oxygen and sulphur.  <br/>
Reason: 1 mole $H_2SO_4$ represents 98 g mass.