Question

Write the name of compound and deduce their
molecular masses Nacl.​

Answer 1

Na 2 SO 4

: Sodium sulphate

Molecular Mass : 23(2)+32+16(4) = 46+32+64 = 142 g/mol K 2 CO 3

: Potassium carbonate

Molecular Mass : 39(2)+12+16(3) = 78+12+48 = 138 g/mol CO 2

: Carbon dioxide

Molecular Mass : 12+16(2) = 12+32 = 44 g/mol

MgCl 2

: Magnesium chloride

Molecular Mass : 24.31+35.5(2) = 95.31 g/mol

NaOH : Sodium hydroxide

Molecular Mass : 23+16+1 = 40 g/mol

AlPO 4

: Aluminium phosphate

Molecular Mass : 27+31+16(4) = 27+31+64 = 122 g/mol

NaHCO 3

: Sodium bicarbonate

Molecular Mass : 23+1+12+16(3) = 23+1+12+48 = 84 g/mol.

Answer 2

Answer:

Copper has the best electrical conductivity of any metal, except silver. A good electrical conductivity is the same as a small electrical resistance. ... This is why copper wires are used in mains cables in houses and underground (although overhead cables tend be aluminium because it is less dense)