The molecular weight of table salt, NaCl, is 58.5 g/mol. A tablespoon of salt weighs 6.37 grams. Calculate the number of moles of salt in one tablespoon.
First, complete the unit conversion using dimensional analysis:
А х
B
С
? mol Naci

.109 moles

A = 6.37

B = 1

C = 58.5

Explanation:

Given : molecular weight of NaCl : 58.5g / mol

We want to calculate the number of moles in a tablespoon of NaCl which weighs 6.37 grams.

To do so we can use dimensional analysis.

the units cancel out and we have to divide 6.37 by 58.5 to get .109 ( rounded to 3 sig figs )

So there are .109 moles in a tablespoon of salt

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.