Answer:- 
atoms of Cu are equals to 4.45 moles.
Solution:- It is a atoms to moles unit conversion for which we divide the given number of atoms by Avogadro number.
We have been given with atoms and asked to convert them to moles.
The set up for this unit conversion problem would be as:
= 4.45 moles
So, there would be 4.45 moles of Cu in atoms of Cu.
<h2>Decomposition</h2>
Explanation:
A synthesis reaction is a type of chemical reaction in which two or more simple substances combine to form a more complex product.
Since there is only one reactant and it is broken into smaller components,
it is not a synthesis reaction.
A decomposition reaction is a type of chemical reaction in which one reactant yields two or more products.
Since in our question,there is one reactant and it is broken to yield two products,it is a decomposition reaction.
Answer:
a) hydrogen gas and a salt
b)sodium sulphate,water and carbon dioxide.
c)barium hydroxide and hydrogen gas.
d)magnesium nitrate and water.
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A sample has 3.28 X 10^24 h atoms
so first we will find the moles of Hydrogen <span>by putting values in formula
that is
. moles </span>= no. of atoms/ Avogadro's no (NA) moles
= 5.446 we got this
<span> now the ratio of Carbon and Hydrogen is: C = H </span>
<span> 3 = 8 </span>
now multiply it with the moles
3/8 * 5.466 = 5.466 2.05 is the moles of C
. now:find the no of C atoms by this
<span> = moles X NA </span>
= 2.05 X 6.022 X 10^23
= 1.27 X10^2
now will find the mass of sampl:
so One mole of C3H8 = 3 moles of C 1/3 * 2.05 = 2.05 moles of C
<span> 0.68 moles of C3H8. </span>
now the mass of C3H8 = moles X molar mass mass of C3H8
which is = 0.68 X 44 =
<span> 30.2 grams of C3H8</span>
