List the five statements in daltons atomic theory

1. All matter is composed of atoms. Atoms cannot be destroyed or created.

2. All atoms of different elements are different in properties.

3. All atoms of the same element are identical in properties.

4. During a chemical reaction, no atoms are created or destroyed. The atoms are rearranged.

5. Compounds are formed by the combination of two different atoms with same ratio.

given:

mass of na = 115 g

excess cl2

to determine:

mass of nacl produced

explanation:

given reaction is-

2na(s) + cl2(g) → 2nacl(s)

since cl2 is in excess, na will be the limiting reagent

as per the reaction stoichiometry na: nacl = 1: 1

i.e. moles of na reacted = moles of nacl formed

now, # moles of na = mass of na/atomic mass

                                  = 115 g/23 g.mol-1 = 5 moles

therefore, moles of nacl = 5

molar mass of nacl = 58 g/mol

mass of nacl = 5 moles * 58 g.mol-1 = 290 g

ans: amount of nacl produced = 290 g

the electrical  conductivity  of asolution  of an electrolyte is measured by determining the resistance of thesolution  between two flat or cylindrical electrodes separated by a fixed distance.