24 g of magnesium is burned in oxygen. The compound formed has a mass of 40g.explain why the mass has gone up

Answers

Answer 1

Answer:

The reason why the mass has increased is because The magnesium reacted with the oxygen around is and combined together to make the compound MgO.

What is conservation of mass?

Antoine Lavoisier discovered in 1789 that mass is neither created nor destroyed in chemical reactions, which led to the formulation of the Law of Conservation of Mass.

That is to say, the mass of any one element at the start of a reaction will be equal to that element's mass at the conclusion of the reaction. The overall mass will remain constant over time in any closed system if we take into account all reactants and products in a chemical reaction.

Because naturally occurring elements are extremely stable under the circumstances present on the Earth's surface, the Law of Conservation of Mass is valid.

Therefore, The reason why the mass has increased is because The magnesium reacted with the oxygen around is and combined together to make the compound MgO.

To learn more about mass, refer to the link:

brainly.com/question/19694949

#SPJ2

Answer 2

Answer: The reason why the mass has increased is because The magnesium reacted with the oxygen around is and combined together to make the compound MgO. The oxygen is the extra mass the magnesium picked up

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Scientists found rock deep in the earth and determined it was three billion years old. This rock is most likely which type of rock?

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Which part of the human ear is part of the inner ear? A)cochlea
B)oval window
C)ear canal
D)Hammer

Answers

Cochlea is present in inner ear !!

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8. What is the heat of reaction when hydrogen and oxygen combine to form water?2H2(g) + O2(g) → 2H2O(1)
(AHC H20(I) = -285.8 kJ/mol)
A -120.9 kJ
B-241.8 kJ
C-571.6 kJ
D-285.8 kJ

Answers

Answer:

The heat of reaction when hydrogen and oxygen combine to form water is :

C. 571.6 kJ

Explanation:

Enthalpy Change = The enthalpy change for the formation of 1 mole of the substance from their standard state is called the enthalpy of formation.

This is intensive quantity as it is fixed for 1 mole .

Intensive properties = Those properties which are independent on the amount of the substance are intensive properties.

The value of these quantities does not get halve if you divide the substance into two equal parts. example , density, refractive index.

However , the enthalpy of reaction is extensive. Because on increasing the amount the value of the enthalpy also get doubles

Hence for this reaction :

$2H_(2)(g)+O_(2)\rightarrow 2H_(2)(l)$

Its value is -285.8 kJ for 1 mole

And here two moles are present . so the value of molar enthalpy is:

-285.8 x 2 = -571.6 kJ

3.00 moles of helium gas (He) are in a container with a volume is 2.00 liters and a temperature is at 298 K. What is the approximate pressure in kilopascals?

Answers

Answer:

3718.628 kPa.

Explanation:

We can use the general law of ideal gas: PV = nRT.

where, P is the pressure of the gas in atm (P = ??? atm).

V is the volume of the gas in L (V = 2.0 L).

n is the no. of moles of the gas in mol (n = 3.0 mol).

R is the general gas constant (R = 0.0821 L.atm/mol.K),

T is the temperature of the gas in K (T = 298.0 K).

∴ P = nRT/V = (3.0 mol)(0.0821 L.atm/mol.K)(298.0 K)/(2.0 L) = 36.7 atm.

To convert from atm to kPa:

∵ 1.0 atm = 101.325 kPa.

∴ P = (36.7 atm)(101.325 kPa/1.0 atm) = 3718.628 kPa.

Please help me with this question!!! On the link that I have attached there are 6 pages scroll down to the 5th page because I need help with number one and number three.I am really confused.
25 points for this question

Answers

Ok so the gravitational force the moon exerts on earth is very small. The ocean, however, is affected by it. How gravity works (in a simplistic sense) is that, when you are closer to something, the force is stronger. So, when the moon is close to Earth (at Perigee) the force of gravity is stronger. So the moon pulls the water more towards itself. This results in higher waves occurring when the moon is closer (at perigee) than at apogee.

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