Question

Solution

Correct option is

36 g of water

Number of molecules present in 36 g of water Number of molecules present in 28 g of CO Number of molecules present in 46 g of C2H5OH Number of molecules present in 54 g of N2O5 .

Here NA is Avogadro’s number. Hence, 36 g of water contain the largest (2NA) number of molecules.

SIMILAR QUESTIONS

Q1

500 mL of NH3 contain molecules at S.T.P. How many molecules are present in 100 mL of CO2 at S.T.P.?

Q2

In the reaction, 4 NH3 + 5 O2 → 4 NO + 6 H2O,

when one mole of ammonia and one mole of oxygen are made to react to completion, then

Q3

An unknown element forms an oxide. What will be the equivalent weight of the element if the oxygen content is 20% by weight?

Q4

A metal M of equivalent mass E forms an oxide of molecular formulaMxOy. The atomic mass of the metal is given by the correct equation

Q5

Which of the following methods of expressing concentration are independent of temperature?

Q6

Pressure is determined as force per unit area of the surface. The S.I unit of pressure, pascal, is as shown below:

1Pa = 1 Nm–2

If mass of air at sea level is 1034g cm-2, calculate the pressure in pascal.

Q7

Determine the molecular formula of an oxide of iron in which the mass percent of iron and oxygen are 69.9 and 30.1 respectively. Given that the molar mass of the oxide is (Atomic mass: Fe = 55.85, O = 16.00 amu)

Q8

A gaseous mixture contains oxygen and nitrogen in the ratio of 1:4 by weight. Therefore, the ratio of their number of molecules is

Q9

The total number of electrons in one molecule of carbon dioxide is

Q10

When the same amount of zinc is treated separately with excess ofsulphuric acid and excess of sodium hydroxide, the ratio of volumes of hydrogen evolved is