Answer:
a. Molarity= ![M =2.1x10^{-1}M](https://tex.z-dn.net/?f=M%20%3D2.1x10%5E%7B-1%7DM)
b. Molality= ![m=2.0x10^{-1}m](https://tex.z-dn.net/?f=m%3D2.0x10%5E%7B-1%7Dm)
Explanation:
Hello,
In this case, given the information about the aniline, whose molar mass is 93g/mol, one could assume the volume of the solution is just 200 mL (0.200 L) as no volume change is observed when mixing, therefore, the molarity results:
![M=\frac{n_{solute}}{V_{solution}} =\frac{3.9g*\frac{1mol}{93g} }{0.2L} =2.1x10^{-1}M](https://tex.z-dn.net/?f=M%3D%5Cfrac%7Bn_%7Bsolute%7D%7D%7BV_%7Bsolution%7D%7D%20%3D%5Cfrac%7B3.9g%2A%5Cfrac%7B1mol%7D%7B93g%7D%20%7D%7B0.2L%7D%20%3D2.1x10%5E%7B-1%7DM)
Moreover, the molality:
![m=\frac{n_{solute}}{m_{solvent}} =\frac{3.9g*\frac{1mol}{93g} }{0.2L*\frac{1.05kg}{1L} } =2.0x10^{-1}m](https://tex.z-dn.net/?f=m%3D%5Cfrac%7Bn_%7Bsolute%7D%7D%7Bm_%7Bsolvent%7D%7D%20%3D%5Cfrac%7B3.9g%2A%5Cfrac%7B1mol%7D%7B93g%7D%20%7D%7B0.2L%2A%5Cfrac%7B1.05kg%7D%7B1L%7D%20%7D%20%3D2.0x10%5E%7B-1%7Dm)
Best regards.
1) Radioactive decay is the spontaneous decomposition of the unstable nucleus of an atom.
2) The emission of a particle or a photon.
For example, alpha decay is radioactive decay in which an atomic nucleus emits an alpha particle (helium nucleus).
3) The result is usually more stable element with smaller atomic number.
For example, in alpha decay atom transforms into an atom with an atomic number that is reduced by two and mass number that is reduced by four.
For example nuclear fission is radioactive decay process in which the nucleus of an atom splits into smaller parts and huge amount of energy is released.
Answer:
atoms have no overall charge. this is because they contain equal numbers of positive protons and negative electrons
2.67×
g of
form when 6. 00 moles of bromine react completely.
As per the chemical equation 2 moles of Aluminum react with 3 moles of Bromine to generate 2 moles of Aluminum Bromide
Molecular Weight of Al= 27 g/mol
Molecular Weight of Bromine= 159.8 g/mol
Molecular Weight of Aluminum Bromide= 266.7 g/mol
So,
Moles of Br = 6 moles
Moles of Al =
= 4moles
similarly,
moles of
=
= 1mole
Moles of
=
1 mole = ![\frac{weight}{266.7}](https://tex.z-dn.net/?f=%5Cfrac%7Bweight%7D%7B266.7%7D)
weight = 2.67×
g
Learn more about Aluminum Bromide here;
brainly.com/question/19459538
#SPJ4
Critical thinking involves questioning and evaluating information. Critical and creative thinking both contribute to our ability to solve problems in a variety of contexts. Evaluating information is a complex, but essential, process. You can use the CRAAP test to help determine if sources and information are reliable.
The key critical thinking skills are: analysis, interpretation, inference, explanation, self-regulation, open-mindedness, and problem-solving.
Critical thinking skills are important because they enable students “to deal effectively with social, scientific, and practical problems” (Shakirova, 2007, p. 42). Simply put, students who are able to think critically are able to solve problems effectively. Merely having knowledge or information is not enough.
Hope it helps