Why does the metric system matter? How many countries use the Imperial/American system? Do you know any examples of the measurement system before the SI system?

The metric system is highly important as its base is on scientific fact and repeatable standards of measurement. .

Also in the metric system the calculation becomes easy like for eg; if are to represent a billion type number or even bigger than that we can take the use of scientific notation and convert that huge number into the powers of tens this not only makes the process of calculation easy but also saves time.

Metric system has been adopted by almost every country in the world.

There are only three countries that still uses imperial/American system of measurement and those are

Other systems than SI are

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