A 2.0-liter aqueous solution contains a total of 3.0 moles of dissolved NH4Cl at 25°C and standard pressure.Determine the molarity of the solution.
Answers
Given that
Volume of solution = 2.0 L
Number of mole of solute = 3.0 mole
Therefore molarity = number of moles / volume in L
= 3.0 Mole /2.0 L
= 1.5 mole / L
= 1.5 M
Molarity:
The number of moles of solute per liter of solution is known as molarity of the solution. It symbolized by M. Molarity of any solution is a ratio of moles of solutes per liter of solution. It expressed by the following formula:
molarity = number of moles / volume in L
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i'll seriously mark you brainly.
please help.
Answers
Answer:
First box: 3
Second box: 4
Third box: 3
Fourth box: 4
Explanation:
I tried out various numbers, but got 3 and 4 because:
3PbI4 + 4CrCl3 -----> 3PbCl4 + 4CrI3
Each term cancels put.
3Pb --> 3Pb
4Cr --> 4Cr
and so forth...
Hope this helps!
Answers
Answer: 22) < 24) 0.003 30,000 25) 1 cc = 1 ml
Explanation:
When give a number in scientific notation, the exponent tells you how many places to move the decimal point.
- Negative moves to the left.
- Positive moves to the right.
25) 1 cubic centimeter (cc) = 1 milliter (ml)
The conversion factor is 1 to 1. You just need to change cc to ml
Answers
Answers
Answer :Option A) The lattice energy increases as cations get smaller, as shown by LiF and KF.
Explanation : It is observed that lattice energy is mostly influenced by two main factors of an ionic solid which are;
i) The charge on the ions - As the charge of the ions increases, the lattice energy is observed to increase too.
and
ii) The radius, or size, of the ions- As the size of the ions increases, the lattice energy decreases with it.
So, here in this question the second reason is clearly observed. Hence, it is self-explained that the size of the cations are decreased in the ionic solids the lattice energy increases.
Answers
Answer:
Not too reactive
Explanation:
Iodine is a halogen and is reactive, but it is significantly less reactive than other halogens like chlorine, bromine, and fluorine.
(2) radium-226 (4) thorium-232
Answers
Answer: Option (1) is the correct answer.
Explanation:
- A positron is a small particle which contains a +1 charge and its mass is equal to the mass of an electron, that is,
kg.
A positron is represent by the symbol .
For example,
- Whereas nitrogen-16 does not decay to give a positron because nitrogen-16 is the daughter isotope formed due to decay of oxygen-16.
The decay reaction is as follows.
- And, on radioactive decay of thorium-232 there will be formation of radium-228 along with emission of an alpha particle.
The reaction will be as follows.
Therefore, we can conclude that out of the given options positrons are spontaneously emitted from the nuclei of potassium-37.