The students can refer to these solutions to excel in the examinations. The exemplar will enable students to improve their overall learning and develop a better knowledge of the subjects. NCERT exemplar notes and worksheets are prepared by our subject experts. University of Ohio: How Are Plants Propogated? Conversion of the above-mentioned molecules into moles is as follows: Molar mass of oxygen gas = 2 Mass of Oxygen =  2 x 16 = 32g, Number of moles = Mass given / molar mass of oxygen gas = 12/32 =  0.375 moles, Molar mass of water = 2 x Mass of Hydrogen + Mass of Oxygen = 2 x 1 + 16 = 18g, Number of moles = Mass given / molar mass of water, Molar mass of carbon dioxide = Mass of C + 2 x Mass of Oxygen = 12 + 2x 16 = 12+32=44g, Number of moles = Mass given/ molar mass of carbon dioxide = 22/44 = 0.5 moles, (a) Mass of 1 mole of oxygen atoms = 16u, hence it weighs 16g, Mass of 0.2 moles of oxygen atoms = 0.2 x 16 = 3.2u, (b) Mass of 1 mole of water molecules = 18u, hence it weighs 18g, Mass of 0.5 moles of water molecules = 0.5 x 18 = 9u. 2. The NCERT Solutions for Class 9 carries all the important questions and answers for all the subjects and chapters. Here are a few examples.

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NCERT Exemplar Class 10 Science is among the most popular study material. Therefore, for 3g of hydrogen, the quantity of oxygen = 3 x 8 = 24g. (b) 4 moles of aluminium atoms((Atomic mass of aluminium =27)? The products were 2.2 g of carbon dioxide, 0.9 g water and 8.2 g of sodium acetate. Questions from all the topics are covered in the solutions. 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