Answer:
a. because of how the earth circulates around the sun.
Answer:
There would be around 2.7*10^24 molecules.
Explanation:
You have to multiply the amount of moles by Avogadro's number to get amount of molecules.
Answer:
A balanced chemical equation must always include coefficients on every reactant and product.
Explanation:
<u>A balanced chemical equation does not need to include coefficients on every reactant and product.</u>
For example, below is a balanced chemical equation in which the reactants and the products have no coefficients whatsoever:
NaOH(aq) + HCl (aq) -----> NaCl (s) + H2O (l)
<em>Of course, a properly written chemical equation must include the states of matter of all the substances in the reaction and the number of atoms of each element must balance both in the reactant and product sides of the equation. Generally, a balanced chemical equation must obey the law of conservation of matter which opines that matter can neither be created nor destroyed but can only be converted from one form to another. </em>
Hence, that a balanced chemical equation must always include coefficients on every reactant and product is not true.
Answer:
X = 5
Explanation:
The molar ratio of water to copper(II) sulfate must be found.
The mass of water that must have been eliminated from the salt is found by the difference in weight before and after:
(500 g) - (320 g) = 180 g water eliminated
The moles of water (MW 18.02 g/mol) is then found:
(180 g) / (18.02g/mol) = 9.9889...mol
The mass of the dehydrated copper(II) sulfate (MW 159.609 g/mol) is converted to moles:
(320 g) / (159.609 g/mol) = 2.004899...mol
The molar proportion of water to the copper(II) sulfate is then calculated:
(9.9889...mol H₂O) / (2.0034899...mol CuSO₄) ≅ 5
