Question

The mass of 5 moles of sodium is -------------
a) 46g
b) 34g
c) 105g
d) 115g​

Answer 1

$\orange{ \boxed{ \boxed{ \begin{array}{cc} \leadsto \bf \: given \: : \\ \\ \rm \to \: no. \: of \: mole \: \: n = 5 \\ \\ \sf\leadsto \: we \: have \: to \: find : \\ \\ \rm \to \: mass \: or \: \: weight \: of \: sodium = w \\ \\ \sf \: we \: know \: that \\ \\ \rm \to \: molecular \: mass \: \: of \: sodium \: \: M \: = 23 \\ \\ \bf \: and \\ \\ \rm \: no. \: of \: mole \: \:( n)= \frac{weight(w)}{molecular \: mass(M)} \\ \\ \rm \implies \: 5 = \frac{w}{23} \\ \\ \rm \implies \: w = 5 \times 23 \\ \\ \rm \implies \: w = 115 \: g\end{array}}}}$

So option d) 115 g is the correct answer.

Answer 2

Answer:

$\huge{\boxed{\mathfrak{Answer:-}}}$

Correct option is

B

2

Molar mass of sodium =23

The given mass of sodium =46

Hence, total number of moles =

Molar mass

Mass

=

23

46

=2