Answer:
1) a. 2Fe(s) + 3Cl₂(g) → 2FeCl₃(s).
2) a. 0.4477 mol.
b. 0.4477 mol.
c. 72.61 g.
Explanation:
1) Consider the following reaction: iron (s) + chlorine (g) à iron (III) chloride
<em>a. Write the balanced chemical equation.</em>
- The balanced equation should apply the law of conversation of mass that the no. of different atoms is equal in both sides of the reaction (reactants and products sides).
So, the balanced chemical equation is:
<em>2Fe(s) + 3Cl₂(g) → 2FeCl₃(s).</em>
It is clear that 2 mol of Fe(s) react with 3 mol of Cl₂(g) to produce 2 mol of FeCl₃(s).
<em>2) 25.0 g of iron reacts with excess chlorine gas. </em>
<em>a. Calculate the moles of iron reactant.</em>
- The no. of moles of Fe (n) can be calculated using the relation:
<em>n = mass/molar mass =</em> (25.0 g)/(55.845 g/mol) = <em>0.4477 mol.</em>
<em>b. Calculate the moles of iron (III) chloride.</em>
<em><u>Using cross multiplication:</u></em>
2 mol of Fe produce → 2 mol of FeCl₃, from stichiometry.
∴ 0.4477 mol of Fe produce → 0.4477 mol of FeCl₃.
∴ The no. of moles of iron (III) chloride produced is 0.4477 mol.
<em>c. Calculate the mass of iron (III) chloride.</em>
- We can calculate the mass of iron (III) chloride produced using the relation:
mass of iron (III) chloride = (no. of moles)*(molar mass) = (0.4477 mol)*(162.2 g/mol) = 72.61 g.
Answer:
A is the answer. Chemical changes happen when atomic bonds are broken or created during chemical reactions. Hence, in this case, it involve changes to molecular structure.
- Change in states are physical changes.
- When salts are dissolved in water, you can use Distillation to separate them. Distillation is a physical change as well.
- Dissolving is just physical change.
Explanation:
The statement that is true of a chemical change among the statements given in the question is "It involves changes in the molecular structure". The correct option among all the options that are given in the question is the first option or option "A". I hope the answer has actually come to your help.
<span> A huge meteor struck the earth and caused the chemicals to change.</span>
Answer:
Protons and neutrons have very similar mass, while electrons are far lighter, approximately 11800 times the mass. Protons are positively charged, neutrons have no electric charge, electrons are negatively charged. The size of the charges is the same, the sign is opposite
Explanation:
Answer:
A free body diagram is used to calculate static and dynamic forces acting on an object. In other words, a free body diagram is the starting point to develop a mathematical model to find and calculate various forces acting on a body.
Explanation:
