The cause the percent yield of sodium chloride to be less
than 100% is that there are less solute particles of Sodium chloride present in
the solution. When it is more than 100%, the solute particles are more than the
solvent particles in the solution.
The mixtures that can be separated using filtration are :
A. sand and water
C. Sugar and water
D. Salt and water
The size of pebbles is usually too big to be separated using filtration. It will get stuck in the process
The atomic mass of copper on the periodic table is a mixture of all the stable isotopes of the element. In short, it is a weighted average.
The atomic mass for Cu is 63.546 amu. This number is calculated by multiplying the masses of the isotopes by their percent occurrence or abundance in nature. For copper, it would be as follows:
atomic mass = ( Isotope 1 x % abundance) + ( Isotope 2 + % abundance)
We are given the mass of both the isotopes. We only need to look up the weighted average of their weights or the atomic mass which is already mentioned above. Substituting what is given to the equation:
63.546 amu = (62.930 amu ( x )) + (<span>64.928 amu</span> ( 1 - x ))
where x is the percent abundance of the first isotope. Calculating for x, we will have
x =0.69 = 69%
1-x = 0.31 = 31%
