Calculate the number of molecules in 4 g of oxygen.

Academic Chemistry NCERT Class 9

Mass of oxygen = 4g

We know 32g of oxygen contains 6.022 × 10²³ molecules.

Number of molecules in 32g of oxygen = 6.022 × 10²³

Number of molecules in 4g of oxygen = 4 × 6.022 × 10²³/32

Therefore, 4g of oxygen have 7.52 × 10²² molecules.

Tutorialspoint

Simply Easy Learning

Updated on: 10-Oct-2022

2K+ Views

Calculate the number of molecules of sulphur (S8) present in 16 g of solid sulphur.
Calculate the mass of 12.044 × 1025 molecules of oxygen (O2).
If 16 g of oxygen contains 1 mole of oxygen atoms, calculate the mass of one atom of oxygen.
What weight of oxygen gas will contain the same number of molecules as 56 g of nitrogen gas?(O = 16 u ; N = 14 u)
If one mole of nitrogen molecules weighs 28 g, calculate the mass of one molecule of nitrogen in grams.
(a) Define gram molecular mass of a substance. How much is the gram molecular mass of oxygen?(b) If sulphur exists as S8 molecules, calculate the number of moles in 100 g of sulphur. (S = 32 u)
A 0.24 g sample of a compound of oxygen and boron was found by analysis to contain 0.096 g of boron and 0.144 g of oxygen. Calculate the percentage composition of the compound by weight.
Which contains more molecules, 10 g of sulphur dioxide (SO2) or 10 g of oxygen (O2)?(Atomic masses : S = 32 u ; O = 16 u)
Calculate the number of molecules present in a drop of chloroform (CHCl3) weighing 0.0239 g.(Atomic mass : C = 12 u ; H = 1 u ; Cl = 35.5 u)
Pick up the wrong pairs/combination(a) 6.022 x 1023 molecules of oxygen = 32 g of oxygen(b) 6.022 x 1023 ions of sodium = 23 g of Na(c) 6.022 x 1023 atoms of C = 24 g of carbon(d) 6.022 x 1023 atoms of H = 1 g of H atom.
Calculate(a) the mass of one atom of oxygen(b) the mass of one molecule of oxygen(c) the mass of one mole of oxygen gas(d) the mass of one ion of oxygen(e) the number of atoms in 1 mole of oxygen molecule
How many moles of O2 are there in 1.20 × 1022 oxygen molecules?
Fill in the following blanks :(a) 1 mole contains ...................... atoms, molecules or ions of a substance.(b) A mole represents an ..................... number of particles of a substance.(c) 60 g of carbon element are ................... moles of carbon atoms.(d) 0.5 mole of calcium element has a mass of ......................(e) 64 g of oxygen gas contains ....................... moles of oxygen atoms.
Convert 12 g of oxygen gas into moles.
What is the number of molecules in 1.5 moles of ammonia?

Kickstart Your Career

Get certified by completing the course

Get Started

Advertisements