A 0.8115 g sample of HCl was placed into a 50 mL volumetric flask and the sample was thoroughly dissolved in water to make 50 mL of solution. It required 22.07 mL of NaOH to reach the endpoint in the titration. What is the molarity of the NaOH solution?
Answers
Answer:
Molarity of NaOH solution is 1.009 M
Explanation:
Molar mass of HCl is 36.46 g/mol
Number moles = (mass)/(molar mass)
So, 0.8115 g of HCl = HCl = 0.02226 moles HCl
1 mol of NaOH neutralizes 1 mol of HCl.
So, if molarity of NaOH solution is S(M) then moles of NaOH required to reach endpoint is
So,
or, S = 1.009
So, molarity of NaOH solution is 1.009 M
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Which is true of transition metals when moving from left to right on the periodic table?The d sublevels are not filled across the period. The cation radii become larger across the period. Atomic radii increase slightly and then start to decrease. Atomic radii decrease slightly and then start to increase.
Show the formulas of the reactants
Answers
Answer:
1. B Decantation. 2. D 3. B
Explanation:
This method is often used when dealing with mixtures of liquids or immiscible liquids with different densities
2. This is because the denser substance sinks to the bottom due to its higher density, while the less dense substance remains on the surface. It allows for the separation of the two substances based on their density.
3. The mixture is left undisturbed after the less dense substance has been poured off. This allows the denser substance to settle at the bottom while the lighter substance remains on top
4. It's a handy method for separating substances based on their density For example, if you have a mixture of oil and water, you can use decantation to separate the two. By letting the mixture sit undisturbed, the oil, being less dense, will float to the top, allowing you to carefully pour it off and separate it from the water.
(2) increases, only
(3) decreases, then increases
(4) increases, then decreases
Answers
Answer is: (2) increases, only.
The atomic radius of a chemical element is a measure of the size of its atom.
The atomic radius varies with increasing atomic number, but usually increases because of increasing of number of electrons.
Nitrogen (N), phosphorus (P), arsenic (As), antimony (Sb), bismuth (Bi) and moscovium (Mc) are in group 15 of Periodic table. They have same number of valence electrons (five).
Nitrogen has smallest atomic number and smallest atomic radius.
As atomic number increases within group 15, the atomic radius ; ( 2 )
- Increases only
In the periodic table, the size of the atomic radius will continue to change as the the atomic number of the elements increase. Elements in the same group have the same/similar number of valence electron counts and also similar vacancy counts as well.
Therefore as you go down the group, the atomic number of the elements in the same group increases and in response to that the distance between the nucleus and the outermost shell will also increase ( which is the atomic radius ).
Hence we can conclude that As atomic number increases within group 15,the atomic radius Increases only .
Learn more : brainly.com/question/17818894
A) Ca
B) Se
C) Zn
D) Mn
Answers
Answers
Answer:
C.
Explanation:
Molecules with the stronger intermolecular forces are pulled tightly together to form solid at higher temperatures and that's why the freezing point is higher.
Also, molecules with the stronger intermolecular force have greater interaction between the molecules and thus on heating do not boil easily and have high boiling point also.
Thus, melting point and boiling point increases with increase in number of carbon atoms and also increase in intermolecular forces (like hydrogen bonding, if present).
Thus, the compound which is gas at room temperature is because it has least number of carbon atoms and absence of hydrogen bonding.
Final answer:
Among the choices, only CH3CH2CH3 (propane) is a gas at room temperature. The other compounds, CH3CH2OH (ethanol), CH3CH2CH2CH2CH2CH2CH3 (hexane), and HOCH2CH2OH (ethylene glycol) are all liquids.
Explanation:
Among the four compounds given, compound C, which is CH3CH2CH3 (also known as propane), is a gas at room temperature. Compound A (CH3CH2OH, or ethanol), compound B (CH3CH2CH2CH2CH2CH2CH3, or hexane), and compound D (HOCH2CH2OH, or ethylene glycol) are all liquids at room temperature.
The state of a compound at room temperature depends on factors like molecular mass and intermolecular forces. Propane has a smaller molecular mass and weaker intermolecular forces than the others, making it a gas at room temperature.
Learn more about States of Compounds here:
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Answers
Answer : 3 substance will have 3 mole ratios to be written for a chemical reaction.
Explanation : The mole ratio can be defined as the ratio between the amounts in moles of any two or more compounds involved in a chemical reaction.
It can be determined by comparing the coefficients the formulas of a balanced chemical equation. It is also known as the molar ratio or mole-to-mole ratio.
Hence, when 3 substances are involved in a chemical reaction 3 mole ratios can be written for it.