Mahesh gifts a diamond ring of $0.1$ mole to Suresh on his birthday. How many grams of diamond did he gift?

Among the following,choose the ones with an equal number of atoms.
$A$. $212 \ g$ of $Na_2CO_3(s)$ [molar mass $= 106 \ g/mol$]
$B$. $248 \ g$ of $Na_2O(s)$ [molar mass $= 62 \ g/mol$]
$C$. $240 \ g$ of $NaOH(s)$ [molar mass $= 40 \ g/mol$]
$D$. $12 \ g$ of $H_2(g)$ [molar mass $= 2 \ g/mol$]
$E$. $220 \ g$ of $CO_2(g)$ [molar mass $= 44 \ g/mol$]
Choose the correct answer from the options given below.

How many moles of $Al_2(SO_4)_3$ are present in $50 \ g$ of the substance?

The number of moles of electrons in $1 \ kg$ of electrons is .......

What is the number of hydrogen atoms present in $5.4 \ g$ of urea?

What is the mass of $1 \times 10^{22}$ molecules of $CuSO_4 \cdot 5H_2O$?