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3 years ago

What is a measure of force that is generated by the action of gravity on the mass of an object

Chemistry

1 answer:

Dennis_Churaev [7]3 years ago

7 0

The stronger the pull of gravity the greater the mass

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How many oxygen atoms are in 25 g of oxygen?

shutvik [7]

Answer:

Explanation:

Carbon Dioxide-CO2

To get molecules, we must convert grams to moles and moles to atoms using Avogadro's number.

Molar mass of CO2=

C:12.0g+O:16.0gx2=44.0g CO2

25.0g CO2 | 1 mol CO2 | 6.02x10 23 molecules CO2

= 3.42x10 23 molecules CO2

1 | 44.0g CO2 | 1 mol CO2

Now to get the number of oxygen atoms.

Since there are 3 atoms in CO2 and 2 of them are oxygen, we will divide by 3 (1.14x10 23) and multiply by 2 (2.28 x10 23)

So the number of oxygen atoms in 25.0 grams of CO2 is 2.28x10 23 or 228 000 000 000 000 000 000 000

8 0

3 years ago

The standard free-energy changes for the reactions below are given.Phosphocreatine → creatine + Pi ∆ G'° = –43.0 kJ/molATP → ADP

Anton [14]

Answer:

Gibbs free-energy of the reaction = (–12.5 kJ/mol)

Explanation:

The Gibbs free-energy of a reaction predicts the spontaneity or feasibility of a given chemical reaction.

Given the standard Gibbs free energy changes:

Phosphocreatine → creatine + Pi, ∆G° = –43.0 kJ/mol ...(1)

ATP → ADP + Pi , ∆G° = –30.5 kJ/mol ....(2)

Now to calculate the Gibbs free-energy of the given chemical reaction: Phosphocreatine + ADP → creatine + ATP; the equation (2) is reversed to give:

ADP + Pi → ATP, ∆G° = + 30.5 kJ/mol ...(3)

Now the equation (3) and (1) are added, to give:

Phosphocreatine + ADP + Pi→ creatine + ATP + Pi

⇒ Phosphocreatine + ADP → creatine + ATP

Therefore, to calculate the Gibbs free-energy of the reaction, the standard Gibbs free energy changes of the equations (1) and (3) are added similarly:

Gibbs free-energy of the reaction: ∆G° = (–43.0 kJ/mol) + ( + 30.5 kJ/mol) = (–12.5 kJ/mol)

Therefore, the Gibbs free-energy of the reaction = (–12.5 kJ/mol)

7 0

3 years ago

14. Which of the following will result in a chemical change?

user100 [1]

Answer:

Explanation:

a chemical change is when a substance changes into another.

wood burning turns into heat which would be considered a chemical change

6 0

3 years ago

Which of these statements best describes the formula unit for a compound made from Mg and Cl?

olga2289 [7]

Answer:

It is MgCl₂ because the total positive charge on Mg is two

Explanation:

The bond between the atoms that makes up the formula unit of the compound is an ionic bond. This bond involves the transfer of electrons between atoms.

Mg is in the second group on the period on the periodic table. It has two valence electrons and would readily lose it to have a stable atomic configuration like those of noble gases. This leaves magnesium with a net positive charge of 2. Each chlorine atom gains one electron to achieve their own octet.

8 0

3 years ago

Read 2 more answers

Is it true or false that dry air is 78% nitrogen and 21% carbon dioxide?

Komok [63]

The answer is false, oxygen

5 0

4 years ago