A substance X contains 10 gram of calcium carbonate calculate the number of mole of calcium carbonate present in X

☃️ Chemical formulae ➝

For solving this question, We need to know how to find moles of solution or any substance if a certain weight is given.

Atomic weight of elements:

Ca = 40

C = 12

O = 16

❍ Molecular weight of

= 40 + 12 + 3 × 16

= 52 + 48

= 100 g/mol

❍ Given weight: 10 g

Then, no. of moles,

⇛ No. of moles = 10 g / 100 g mol‐¹

⇛ No. of moles = 0.1 moles

☄ No. of moles of Calcium carbonate in that substance = 0.1 moles

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"you start with 15.67 g mgco3-xh2o, when heated and all the water is removed, you are left with 7.58 g mgco3 only.

therefore, you had 15.67 - 7.58 = 8.09g h2o  

moles of each :

7.58g mgco3 = ? moles = 7.58g / 83.4g/mole = 0.09moles  

8 09g h2o = ? moles = 8.09g / 18g/mole = 0.44moles  

molar ratio between the two by dividing both numbers by the smallest number :

0.09 / 0.09 = 1  

0.44 / 0.09 = 4.8  

mgco3-5h2o"

gasoline is a mixture. it contains several different kinds of compounds that can be present in a variety of ratios.