Hello!
What is the mass of 2.50 ×1022 molecules of NaOH (Molar mass = 40.0 g/mol)?
Data:
Molar Mass of NaOH = 40 g/mol
Solving: According to the Law Avogradro, we have in 1 mole of a substance, 6.02x10²³ atoms/mol or molecules
1 mol -------------------- 6.02*10²³ molecules
y mol -------------------- 2.50*10²² molecules
Product of extremes equals product of means
Solving: Find the mass value now
40 g ----------------- 1 mol of NaOH
x g ------------- 0.042 mol of NaOH
Answer:
The mass is 1.68 grams
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Answer: 1.6.905.x2.00=amu
Explanation:
if you multiply the atomic mass x 2.00 it will give you 1.6.905x2.00Amu your welcome
(A) composed of macromolecules held together by strong bonds
(B) composed of atoms held together by delocalized electrons
(C) composed of positive and negative ions held together by electrostatic attractions
(D) composed of molecules held together by intermolecular dipole–dipole interactions
(E) composed of molecules held together by intermolecular London forces
The solid HCl is composed of molecules held together by intermolecular dipole–dipole interactions. The significant electronegativity difference between H and Cl make the dipole -dipole force in between HCl molecules.
Dipole -dipole forces arises between molecules of permanent dipole moment. Covalent compounds are formed between two non-metals through electron sharing .
When one atoms is highly electronegative compared to the other, the shared pair of electrons attracts more to the electronegative atom. Which make partial charge separation and the compound becomes polar.
Two polar molecules attracts each other through dipole -dipole forces. HCl is a polar compound. Thus, in HCl solid, HCl molecules are held together by dipole -dipole forces.
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b. compound
c. solution
d. suspension
e. colloid
The substances that can't be separated into simpler substances or converted into other substances by chemical processes are elements. They are fundamental substances and cannot be changed into other elements through chemical processes. The correct answer to the given question is option a. elements
The answer to your question is a. elements. In chemistry, elements are substances that cannot be separated into simpler substances or converted into another substance by chemical processes.
This is what makes them fundamental substances. Chemical processes can change compounds, solutions, suspensions, and colloids into different substances, but they cannot change an element into a different element. For example, hydrogen is an element that cannot be converted into any other element through chemical processes. It is fundamentally hydrogen.
The correct answer to the given question is option a. elements
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The answer for the following problems is mentioned below.
Explanation:
Mole:
The mass of a substance containing the same number of fundamental units as there are atoms in exactly 12.000 g of .
Given:
volume (v) = 4.7 litres
Volume of argon at STP conditions = 22.4 litres
To find:
volume of argon at STP conditions
We know;
n =
where;
n represents the no of moles
v represents the volume of the argon
V represents the volume of argon at STP
volume of the argon at STP conditions is 22.4 litres
So;
n =
n = 0.20 moles
Therefore the number of moles present in Argon is 0.20 moles.
A calorimeter contains 500 g of water at 25°C.....
the temperature of the water inside the calorimeter is 39.4°C.....
The specific heat of water is 4.18 J/g-°C.
energy needed to heat the water = specific heat * mass * temp difference
= 4.18 J/g-°C * 500 g * (39.4°C - 25°C)
= 4.18*500*14.4
= 30096J
or approx. 30kJ
Energy=specific heat of water x mass of water x water's temperatures
=4.18x500x(39.4-25)
=30096J