Acompound of formula xcl3 reacts with aqueous agno3 to yield solid agcl according to the following equation: xcl3(aq)+3agno3(aq)→x(no3)3(aq)+3ag cl(s) when a solution containing 0.521 g of xcl3 was allowed to react with an excess of aqueous agno3, 1.68 g of solid agcl was formed. what is the identity of the atom x?

Aluminum

Explanation:

Mass of = 1.68 g

Molar mass of = 143.32 g/mol

Thus,

From the reaction below:

3 moles of are produced when 1 mole of undergoes reaction.

So,

1 mole of are produced when mole of undergoes reaction.

0.01172 mole of are produced when mole of undergoes reaction.

Thus, moles of = 0.0039 moles

Let the atomic mass of X = x g/mol

atomic mass of chlorine = 35.5 g/mol

Thus, Molar mass of = x + 3(35.5) g/mol = x + 106.5 g/mol

Moles = 0.0039 moles

Mass = 0.521 g

Thus, molar mass = Given mass/ Moles = 0.521 / 0.0039 = 133.5897 g/mol

So,

x + 106.5 = 133.5897

x = 27.0897 g/mol

This Atomic weight corresponds to Aluminum. Hence, X is aluminum.

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.