Question number 1 to 20

Question number 1 to 20 2. 3. 4. 5. 6. 7, 8. 9. Define term mole. What is Avogadro's umber? What is gram atomic weight? What is the difference between Name the following compounds AICh and How many moles of sodium atoms correspond to 1.56 x 102' atoms of sodium? What is the relationship between the formula weight ofa substance and its molar mass? How many grams Of silver are in 0.263 mol of g? I low many atoms arc 1.00 x 10-9 g of lead? 10. How many grams of iron are needed to combine with 25.6g of O to make Fe20G 11. What is the mass of 4 moles of aluminum atoms? ( Atomic mass of A1 = 27u) 12. Calculate the mass of 6.022 x 1022atoms of He. 13. Calculate the number Of moles in 3.011 x 1022 molecules Of carbon dioxide. 14. A of 45,8g of how many moles of 11204? 15. What s the mass in grams of 5 moles of Fe? 16. How many moles of NaC,l are present in 20 gm bf the substance? 17. How many grams of O is present in 50 gm of (_:aC03? 18. I low many grams of C02 are present in 0.1 mole C02? 19. Describe the difference between the mass of a mole of oxygen atoms (O) and the mass Of a mole Of oxygen molecules (02). 20. What -do you understand by the term Formula unit? Class IX Holiday Homework 2018-19

Dear Student,

1. Mole: One mole of a substance (atoms, molecules, ions, or particles) is that quantity in number having a mass equal to its atomic or molecular mass in grams.

One mole of any substance contains 6.022 * 10²³particles (atoms, molecules, or ions), which is termed as avogadro number or avogadro constant.

2. Avogadro Number: The Avogadro Number / Constant is the number of atoms in exactly 12g of carbon-12. Its numerical value is 6.022*10²³.

Hope this information will clear your doubts about the topic.

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