Calculate the number of moles of Cu in 2.4x10^21 atoms of Cu
Answers
Answer:
0.004 moles
Explanation:
To find the number of moles in a substance given it's number of entities we use the formula
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
We have the final answer as
0.004 moles
Hope this helps you
Related Questions
Which change in oxidation number indicates oxidation?(1) –1 to +2 (3) +2 to –3(2) –1 to –2 (4) +3 to +2
For which compound is the process of dissolving in water exothermic?(1) NaCl (3) NH4Cl(2) NaOH (4) NH4NO3
Open-ended Which amino acid would be capable of forming hydrogen bonds with a lysine residue in a protein?
As the temperature of a substance decreases, theaverage kinetic energy of its particles (1) decreases (2) increases (3) remains the same
Answers
Answer:
The H2O sample has the greatest number of atoms. 1.41 moles, or (1.041 moles)*(5.023x10^23) atoms
Explanation:
We need to convert each value into moles, a count of the number of atoms/molecules.
a) 1.0 moles He
b) 0.60 moles H2
c) 20 grams K: convert to moles with the molar mass of K
(20 grams K)/(39.1 g/mole K) = 0.511 moles K
d) 8.5 mL H2O (density of H2O = 1 g/mL).
Find the mass of the H2): (8.5 ml)*(1 g/ml) = 8.5 grams H2)
Now calculate moles H2): (8.5 grams)/(18 grams/mole) = 0.473 moles H2O
e) 22.6 g KMnO4
(22.6 g KMnO4 )*(158.0 g/mole) = 0.143 moles
Now we need to take into account the number of atoms per molecule:
Molecule Atoms/Molecule Moles Atoms(moles)
He 1 1.0 1.0
H2 2 0.60 1.2
K 1 0.51 0.51
H2O 3 0.47 1.41
KMnO4 6 0.143 0.86
The H2O sample has the greatest number of atoms. 1.41 moles, or (1.041 moles)*(5.023x10^23) atoms
Answers
Answer:
C) Neutralizing
Explanation:
A neutralizing shampoo is specifically formulated to restore the pH balance of the hair by neutralizing any alkali or unwanted residues that may have accumulated. It is commonly used after chemical treatments such as perms or relaxers, which can alter the hair's pH level.
Chemical processes like perms and relaxers often involve the use of alkaline substances to break down and reshape the hair structure. After the process is complete, a neutralizing shampoo is used to stop the chemical reaction and bring the hair's pH back to its normal, balanced state. This helps to ensure the hair's health, smoothness, and manageability.
Answers
It forms a new substance (water vapor), which is a physical change.
It changes the color of water, which is a physical change.
It changes the molecular structure of water, which is a physical change.
It separates dissolved substances, which is a physical change.
Answers
Answer: the last choice, It separates dissolved substances, which is a physical change.
Explanation:
Physical changes do not modify the composition of the substances.
The substances that undergo a physical change do not brake or form chemical bonds, they just modify ther appearance: the size, the physical state (solid, liquid, or solid), the density, the shape, that kind of properties.
The salts dissolved and the water will have the same chemical propertiesin solution and after being separated, so they have not had a chemical change, they have only changed their appearance, so this explains why it is a physical change.
Answers
37/20Ca --> 37/19K + 0/+1e
Explanation:
Transmutation, conversion of 1 element into another. A transmutation entails an amendment within the structure of atomic nuclei and thus is also induced by an action (q.v.), like nucleon capture, or occur ad libitum by decay, like disintegration and disintegration(qq.v.)
Answers
Answer:
minimum energy
Explanation:
minimum energy means maximum stability
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