Question

Read the following passage and answer for the following: the field of chemistry, a mole is defined as the amount of a substance that contains exactly 6.02214076 * 1023 ‘elementary entities’ of the given substance.The number 6.02214076*1023 is popularly known as the Avogadro constant and is often denoted by the symbol ‘NA’. The elementary entities that can be represented in moles can be atoms, molecules, monoatomic/polyatomic ions, and other particles (such as electrons).For example, one mole of a pure carbon-12 (12C) sample will have a mass of exactly 12 grams and will contain 6.02214076*1023 (NA) number of 12C atoms. The number of moles of a substance in a given pure sample can be represented by the following formula:n = N/NAWhere n is the number of moles of the substance (or elementary entity), N is the total number of elementary entities in the sample, and NA is the Avogadro constant.
Option 1
14. A. How many grams of sodium must be taken to get 1 mole of the element ? *
1 point
23g
35.5 g
63.5 g
46 g
14.B. How many number of moles are there in 5.75 g of sodium. *
1 point
0.25
0.5
1
2.5
14.C What is the mass in grams of 2.42 mol of zinc ? ( Atomic mass of Zn = 65.41 *
1 point
200g
25g
85g
158g
14.D. what is the mass of 0.2 mole of oxygen atoms? *
1 point
32g
0.32g
3.2g
320g
15. 0.5 mole of water molecules? *
1 point
9g
0.9g
90g
0.09g

Answer 1

Answer:

6.02214076 × 1023 elementary entities