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InterviewSolution
| 1. |
unich ContaSeam numbex of atom preson in gomot ca |
| Answer» <p>The molar mass (i.e. the mass of one mole of particles) of Calcium is 40g. This means that there are 6.023 X 1023atoms of calcium in 40g of calcium. Thus</p><p>Number of atoms in 40g of calcium = 6.023 X 10^23</p><p>number of atoms in 1g of calcium = (6.023 X 10^23) / 40</p><p>number of atoms in 4g if calcium = (6.023 X 10^23X 4) / 40</p><p>= 6.023 X 10^22</p><p>So, the number of atoms in 4g of Ca are 6.023 X 10^22. We have to calculate the mass of magnesium which contains the same number of atoms as 4g of Ca. Now the molar mass of magnesium is 24g. This means that there are 6.023 X 10^23atoms of sodium in 24g of magnesium. Thus</p><p>Mass of 6.023 X 10^23atoms of magnesium = 24g</p><p>Mass of 1 atom of magnesium = [24/ (6.023 X 10^23)]</p><p>Mass of 6.023 X 10^22atoms of magnesium= [24 X (6.023 X 10^22)] / (6.023 X 10^23)</p><p>= 2.4g</p> | |