Which of the following correctly represents 3 | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(A) The molar mass of water $(H_2O)$ is $(2 	imes 1) + 16 = 18 \,g/mol$.Number of moles = $\frac{	ext{Given mass}}{	ext{Molar mass}} = \frac{360 \,

Vedclass · Accepted Answer

$(ii)$ and $(iv)$

Vedclass · Answer

(A) The molar mass of water $(H_2O)$ is $(2 	imes 1) + 16 = 18 \,g/mol$.Number of moles = $\frac{	ext{Given mass}}{	ext{Molar mass}} = \frac{360 \,g}{18 \,g/mol} = 20 \,moles$.Thus,statement $(ii)$ is correct.Number of molecules = $	ext{Number of moles} 	imes 	ext{Avogadro's number} (N_A)$.Number of molecules = $20 	imes 6.022 	imes 10^{23} = 1.2044 	imes 10^{25}$ molecules.Thus,statement $(iv)$ is correct.Therefore,the correct options are $(ii)$ and $(iv)$.

Which of the following correctly represents $360 \,g$ of water?

Similar Questions

Calculate the number of aluminium ions present in $0.051 \, g$ of aluminium oxide.
[Hint: The mass of an ion is the same as that of an atom of the same element. Atomic mass of $Al = 27 \, u$.]

Do $5$ moles of $CO_{2}$ and $5$ moles of $H_{2}O$ have the same mass?

$A$ sample of ethane $(C_2H_6)$ gas has the same mass as $1.5 \times 10^{20}$ molecules of methane $(CH_4)$. How many $C_2H_6$ molecules does the sample of gas contain?

Calculate the molar mass of the following substances.
$(a)$ Ethyne,$(C_2H_2)$
$(b)$ Sulphur molecule,$(S_8)$

Calculate the number of molecules of sulphur $(S_8)$ present in $16 \, g$ of solid sulphur.

Vedclass Test Series

Exam Paper Generator

Online Exam Module