Answers
Answer: The mole fraction of calcium chloride and water in the solution is 0.057 and 0.943 respectively
Explanation:
We are given:
Molality of calcium chloride = 3.35 m
This means that 3.35 moles of calcium chloride are present in 1 kg or 1000 g of water
To calculate the number of moles, we use the equation:
Given mass of water = 1000 g
Molar mass of water = 18.02 g/mol
Putting values in above equation, we get:
Total moles of solution = [3.35 + 55.49] = 58.84 moles
Mole fraction of a substance is given by:
- For calcium chloride:
- For water:
Hence, the mole fraction of calcium chloride and water in the solution is 0.057 and 0.943 respectively
Answer:
49.3% water
Explanation:
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A chemist prepares hydrogen fluoride by means of the following reaction:CaF2 + H2SO4 --> CaSO4 + 2HFThe chemist uses 11 g of CaF2 and an excess of H2SO4, and the reaction produces 2.2 g of HF.(a) Calculate the theoretical yield of HF.(b) Calculate the percent yield of HF.
2) However, when additional aqueous hydroxide is added the precipitate redissolves forming a soluble Pb(OH)42-(aq) complex ion
Answers
Answer: The chemical equations are given below.
Explanation:
- For 1:
The chemical equation for the reaction of lead nitrate and sodium hydroxide follows:
By Stoichiometry of the reaction:
1 mole of aqueous solution of lead nitrate reacts with 2 moles of aqueous solution of sodium hydroxide to produce 1 mole of solid lead hydroxide and 2 moles of aqueous solution of sodium nitrate.
- For 2:
The chemical equation for the reaction of lead hydroxide and hydroxide ions follows:
By Stoichiometry of the reaction:
1 mole of lead hydroxide reacts with 2 moles of aqueous solution of hydroxide ions to produce 1 mole of aqueous solution of tetra hydroxy lead (II) complex
Hence, the chemical equations are given above.
The balanced chemical equation for each of the reactions is as follows:
- Pb(NO3)2(aq) + 2NaOH(aq) → 2 NaNO3(aq) + Pb(OH)2(s)
- Pb(OH)2 + 2OH- → Pb(OH)42-
How to balance chemical equation?
A chemical equation is said to be balanced when the number of atoms of each element on both sides of the equation are the same.
According to this question, when aqueous sodium hydroxide is added to a solution containing lead(II) nitrate, a solid precipitate forms. The balanced equation are as follows:
Pb(NO3)2(aq) + 2NaOH(aq) → 2 NaNO3(aq) + Pb(OH)2(s)
Also, when additional aqueous hydroxide is added the precipitate redissolves forming a soluble Pb(OH)42-(aq) complex ion. The balanced equation is as follows:
Pb(OH)2 + 2OH- → Pb(OH)42-
Learn more about balanced equation at: brainly.com/question/1301642
Answers
Explanation:
2NOBr(g) --> 2NO(g) 1 Br2(g)
Rate constant, k = 0.80
a) Initial concentration, Ao = 0.086 M
Final Concentration, A = ?
time = 22s
These parameters are connected with the equation given below;
1 / [A] = kt + 1 / [A]o
1 / [A] = 1 / 0.086 + (0.8 * 22)
1 / [A] = 11.628 + 17.6
1 / [A] = 29.228
[A] = 0.0342M
b) t1/2 = 1 / ([A]o * k)
when [NOBr]0 5 0.072 M
t1/2 = 1 / (0.072 * 0.80)
t1/2 = 1 / 0.0576 = 17.36 s
when [NOBr]0 5 0.054 M
t1/2 = 1 / (0.054 * 0.80)
t1/2 = 1 / 0.0432 = 23.15 s
Answer:
(a)
(b)
Explanation:
Hello,
(a) In this case, as the reaction is second-ordered, one uses the following kinetic equation to compute the concentration of NOBr after 22 seconds:
(b) Now, for a second-order reaction, the half-life is computed as shown below:
Therefore, for the given initial concentrations one obtains:
Best regards.
Alkaline Earth Metals
Alkali metals
Noble Gases
Lanthanides
Answers
Answer:
alkali metals- Group 1
Explanation:
they have less valence electrons and therefore are more reactive
emperature. What is the independent variable in his experiment?
a. The unknown substance, because it's the only thing he changed
b.The temperature, because it's the only thing he changed
Answers
Answer:
a
Explanation:
Answers
Answer:
Polarity
Cohesion
Adhesion
High Specific Heat
Explanation:
6. What is the activation energy for this reaction? _____
7. What is the change in free energy for the reaction? _____
8. How many intermediates are involved in this reaction? _____
9. How many transition states are involved in the reaction mechanism? _____
10. Is the reaction endergonic or exergonic overall?
Answers
6. Activation energy is the difference in energy between the reactant and the transition state. The energy of the reactant and the transition state are 5 kJ/mol and 15 kJ/mol respectively. The activation energy for this reaction is 10 kJ/mol.
7. The change in free energy for the reaction is the difference in energy between the reactant and the product. The energy of the reactant and the product are 5 kJ/mol and 10 kJ/mol respectively. The change in free energy for the reaction is 5 kJ/mol.
8. There are no intermediates involved in this reaction.
9. There is only one transition state involved in the reaction mechanism. The transition state is indicated by the highest point of the graph.
10. The reaction is endergonic overall. The energy of the product is higher than the energy of the reactants, which is only possible if energy is absorbed by the reaction.