What will be the molarity of a solution, which contains 5.85g of NaCl (s) per 500mL?

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NCERT Exemplar Page No. 1 Some Basic Concepts of Chemistry
Problem 3:- What will be the molarity of a solution, which contains 5.85g of NaCl (s) per 500mL?
(i) 4 molL-1 (ii) 20 molL-1 (iii) 0.2 molL-1 (iv) 2 molL-1
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Mam how to solve this question... 1)0.2 mole of Nacl and 0.3 mole Na2Co3 dissolve in 500ml of H20. Calculate Molarity of Na+ ion...?
2)what is the concentration of nitrate ions if equal volumes of 0.1 M AgNo3 and 0.1M Nacl are mixed together..?

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