15 Questions MCQ Test Online MCQ Tests for Class 9 - Test: Mole Concept
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Detailed Solution for Test: Mole Concept - Question 11
A sulphate ion (SO42-) contains one sulphur atom and four oxygen atoms. Therefore there are 5 atoms in a sulphate ion. In the ammonium ion (NH4+) there is one nitrogen atom and four hydrogen atoms. So, this ion also contains 5 atoms.
Detailed Solution for Test: Mole Concept - Question 15
- The mole allows scientists to calculate the number of elementary entities (usually atoms or molecules) in a certain mass of a given substance.
- Avogadro’s number is an absolute number: there are 6.022x10^23 elementary entities in 1 mole. This can also be written as 6.022x10^23 mol-1.
- The mass of one mole of a substance is equal to that substance’s molecular weight. For example, the mean molecular weight of water is 18.015 atomic mass units (amu), so one mole of water weight 18.015 grams.
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