Chapter 4 Measurement of Matter
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See all →- If 0.2 mol of the following substances are required how many grams of those substances should be taken? (i) We know that, Molar mass= sum of constituent atomic masses Molar mass of NaCl= 23 + 35.5 = 58.5 g/mol Number of moles of a substance= Mo... 1
- Deduce the number of molecules of the following compounds in the given quantities. (i) 32g oxygen, (ii) 90g water (i) 32 g of oxygen : Molecular mass of O_(2 )= 2x16=32 Number of moles of O_(2 )= Mass of O₂ in grams/Molecular mass of O_(2 )= 32/32 = 1mol... 1
- Two samples ‘m’ and ‘n’ of slaked lime were obtained from two different reactions. The details about their composition Slaked lime have two samples ‘m’ and ‘n’ Sample m Mass :7g Mass of constituent oxygen :2g Mass of constituent calcium :5g In sample m, the r... 1
- Write the names of the following compounds and deduce their molecular masses. (i) Na₂SO_(4 )- Sodium sulphate. Molecular mass= sum of masses of individual components Atomic mass of, Na = 23u, S=32u, O=16u ∴ Molecular m... 1
- Explain with examples what is meant by a 'mole' of a substance. A mole is that quantity of a substance whose mass in grams is equal in magnitude to the molecular mass of that substance in daltons. The SI... 1
- What is meant by Unified Atomic Mass Instead of relative atomic mass, it is now possible to determine atomic masses in kg. The Unified Atomic Mass Unit or Dalton is a standard u... 2