*quick* measuring the level of lead in drinking water is the job of a.) a physical chemist b.) a biochemist c.) an analytical chemist

Measuring the level of lead in drinking water is the job of an analytical chemist.

Explanation:

The work of analytical chemists is to analyse the chemical properties and nature of the substance.

They have to perform different experiments using instruments and then conclude about the nature of the sample, chemical properties of the sample, toxicology, concentration and other properties of the samples and then the analytical chemists should give a detailed report on the measurements or analysis he or she has carried out.

So the measuring of lead in drinking water forms under the measurement of toxicology of water as lead is toxic on reaction with water so it is the job of analytical chemists only.

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