Advertisements
Advertisements
Question
Calculate the number of atoms in the following:
52 amu of He
Advertisements
Solution
4 amu = 1 atom of He
∴ 52 amu = `1/4 xx 52`
= 13 atom
RELATED QUESTIONS
Calculate the molar mass of the following substance:
Ethyne, C2H2
What name is given to the amount of substance containing 6.022 × 1023 particles(atoms,molecules or ions) of a substance ?
Fill in the following blanks :
64 g of oxygen gas contains ................ moles of oxygen atoms.
How many moles of calcium carbonate (CaCO3) are present in 10 g of the substance ? (Ca = 40 u ; C = 12 u ; O = 16 u)
Define the term:
Avogadro’s number
Explain the term:
Mole
Two oxides of a metal (M) have 20.12% and 11.19% oxygen. The formula of the first oxide is MO. Determine the formula of the second oxide.
Complete the following calculations. Show working for complete credit :
Calculate the mass of calcium that will contain the same number of atoms as are present in 3.2 gm of Sulphur. [Atomic masses : S = 32, Ca = 40]
Define or explain the term:
Relative atomic mass
Calculate the number of moles of magnesium present in a magnesium ribbon weighing 12 g. Molar atomic mass of magnesium is 24g mol–1.
