How many moles are in 82 g of water?

Answers

Answer 1

Answer: Take 82 grams and divide it by the gfm of water which is 18 g/mole...(82g)/(18.0g/mole)=4.555 -> the answer is 4.6 moles

Answer 2

Answer:

Final answer:

The number of moles in 82 grams of water is calculated by dividing the given mass (in grams) by the molar mass (in g/mol). Thus, the number of moles in 82 grams of water is 4.56 moles.

Explanation:

The number of moles in 82 g of water can be calculated using the molar mass of water. The molar mass of water is the sum of the molar masses of its constituent elements. Hydrogen has a molar mass of approximately 1 g/mol and oxygen has a molar mass of approximately 16 g/mol. Therefore, the molar mass of water is 18 g/mol. To calculate the number of moles in 82 g of water, we divide the mass by the molar mass:

Number of moles = Mass (g) / Molar mass (g/mol)

Number of moles = 82 g / 18 g/mol

Number of moles = 4.56 mol

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How does the number of products in a synthesis reaction compare with the number of reactants? A) the number of products is greater than the number of reactants
B) the number of products is less that the number of reactants
C) the number of products is the same as the number of reactants
D) the number of products may be greater or less than the number of reactants

Answers

Answer: The correct answer is Option B.

Explanation:

Synthesis reaction is defined as the reaction in which two or more substances combine in their elemental state to form a single compound.

The general equation representing this reaction follows:

$A+B\rightarrow AB$

As, number of reactants in this type of reaction will always be more bacuse a single product is forming in this reaction.

Thus, the correct answer is Option B.

If'substance X is a liquid, substance Y is a gas, and substance Z is a solid, and all are at thesame temperature and pressure, then the order of increasing strength of their intermolecular
forces would be

Answers

The answer is Y < X < Z

As an atom becomes an ion, its mass number(1) decreases(2) increases(3) remains the same

Answers

As an atom becomes an ion, its mass number $\boxed{\left( 3 \right){\text{ remains the same}}}$

Further explanation:

The smallest unit of an element is called an atom. It is also known as the building block of matter. An atom is generally represented as $_{\text{Z}}^{\text{A}}{\text{X}}$ , where X is the symbol of the element, A is its atomic mass or mass number and Z is its atomic number.

The number of protons present in the atomic nucleus is termed as the atomic number (Z) whereas the total number of nucleons present in the nucleus of an atom is called mass number or atomic mass (A).

When electrons are either gained or lost from the neutral atom, it results in the formation of ions. Cations are the positively charged ions that are formed due to the removal of electrons from the neutral atom. Anions are the negatively charged ions that result from the addition of electrons to the neutral atom.

Since the formation of either type of ion requires gain or loss of electrons but mass number is the total number of protons and neutrons present in the atomic nucleus, the mass number remains the same when ions are formed from their respective ions. Therefore option (3) is the correct answer.

Consider an example of a sodium atom whose atomic number is 11 so it has an electronic configuration of $1{s^2}2{s^2}2{p^6}3{s^1}$ . It loses one electron to form its monovalent ion, ${\text{N}}{{\text{a}}^ + }$ which has the configuration of $1{s^2}2{s^2}2{p^6}$ . The number of electrons in Na is 11 while that in ${\text{N}}{{\text{a}}^ + }$ is 10. But both the species have same number of protons and neutrons in them. So the mass number remains unchanged if an atom forms its ions.

Learn more:

1. Component of John Dalton’s atomic theory: brainly.com/question/2357175

2. Basis of investigation for the scientists: brainly.com/question/158048

Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: Atomic structure

Keywords: atom, matter, atomic nucleus, proton, electron, neutron, cations, anions, Na, 11, Na+, electronic configuration.

Becoming an ion involves gaining or losing electrons
Electrons have a relative mass of 0
So adding or removing them doesn't change the mass of the atom
So the answer is (3) remains the same

................can loosen the chromatin structure. 1. Acetyl groups and methylated amino acids with a neighhoring phosphate group 2. Methylated groups ONLY! 3. Histone groups ONLY 4. Acetyl groups ONLY!

Answers

Answer:1. Acetyl groups and methylated amino acids with a neighboring phosphate group

Explanation:

Final answer:

Option 4. Acetyl group only can loosen the chromatin structure.

Explanation:

Acetyl groups can loosen the chromatin structure by altering the charge of the histone proteins. When unmodified, the histone proteins have a large positive charge, but by adding acetyl groups, the charge becomes less positive, resulting in a looser packing of nucleosomes.

Histone acetylation affects nucleosome spacing and gene expression. When the chromatin structure is loosened through acetylation, transcription factors can bind to the DNA, allowing genes to be expressed. In conclusion, acetyl groups have the ability to loosen the chromatin structure, which allows for gene expression by enabling transcription factors to bind to the DNA. The correct answer is option 4: Acetyl groups ONLY!

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A newly discovered element, Z, has two naturally occurring isotopes. 90.3 percent of the sample is an isotope with a mass of 267.8 u, and 9.7 percent of the sample is an isotope with a mass of 270.9 u. What is the weighted average atomic mass for this element?

Answers

atomic mass=percentage of isotope a * mass of isotope a + percentage of isotope b * mass of isotope b+...+percentage of isotope n * mass of isotope n.

Data:
mass of isotope₁=267.8 u
percentage of isotope₁=90.3%

mass of isotope₂=270.9 u
percentage of isotope₂=9.7%

Therefore:

atomic mass=(0.903)(267.8 u)+(0.097)(270.9 u)=
=241.8234 u + 26.2773 u≈268.1 u

Answer: the mass atomic of this element would be 268.1 u

the formula of aluminium sulphide is Al₂S₃. Explain why the formula has a ratio of two aluminium ions for every three sulphide ions.

Answers

Molar mass of Al = 27.0 g/mol
Molar mass of S = 32.1 g/mol
Molar mass of Aluminium sulfide = 27.0 x 2 + 32.1 x 3 = 150.3 g/mol
% of Al (there are 2 Al atoms) in Aluminium sulfide = $(54.0)/(150.3) * 100 = 35.9%$
% of S (there are 3 S atoms) in Aluminium sulfide = $(96.3)/(150.3) * 100 = 64.1%$
Assume the percentages to be masses, so:
In 100.0 g of Aluminium sulfide, n (Al) = $(35.9)/(27.0) = 1.33 mol$
In 100.0 g of Aluminium sulfide, n (S) = $(64.1)/(32.1) = 2.00 mol$
Convert values to a molar ratio,
1.33 : 2.00
Divide by smallest ratio value,
1 : 1.50
Multiply each ratio value by a factor of 2 to eliminate the decimal,
2 : 3

Hence why the empirical formula of Aluminium sulfide is $Al_(2) S_(3)$

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