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3 years ago

The net energy released or absorbed during a reversible chemical reaction is equal to

Chemistry

2 answers:

Pavlova-9 [17]3 years ago

5 0

Answer: The correct answer is Option 3.

Explanation:

The net energy absorbed or released in a reaction is known as total enthalpy change of the reaction. It is designated as $\Delta H_{rxn}$

It is defined as the difference between the total potential energy of the products and the total potential energy of the reactants. The equation for this is given by:

$\Delta H_{rxn}=\sum \Delta H_{products}-\sum \Delta H_{reactants}$

where,

$\Delta H_{products}$ = Total potential energy of the products

$\Delta H_{reactants}$ = Total potential energy of the reactants

Hence, the correct answer is Option 3.

enyata [817]3 years ago

3 0

3. The difference between the potential energy of the products and the potential energy of reactants.

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How do atoms combine to make a different types of matter

Yuliya22 [10]

Answer: Atoms of different elements can combine to make new substances or different types of matter.

Explanation:

A molecule is formed when two or more atoms join together chemically. If atoms combine that are of two or more different elements

For example: To form water, some atoms fuse together and form molecules. (H2O).

7 0

3 years ago

How many grams of HNO3 it is required to play 8.75gr N2O 4ZN + 10HNO3-4ZN ( NO3 ) 2 + N20 + 5H2O

Y_Kistochka [10]

Molar mass

HNO₃ = 63.02 g/mol

N₂O = 44.013 g/mol

The balanced equation is :

4 Zn + 10 HNO₃ = 4 Zn(NO₃)₂ + N₂O + 5 H₂O

10 * 63.02 g HNO₃-----------> 44.013 g N₂O
? HNO₃ -----------------> 8.75 g N₂O

Mass HNO₃ = 8.75 * 10 * 63.02 / 44.013

Mass HNO₃ = 125 g

hope this helps!

4 0

4 years ago

A 25.00 mL sample containing an unknown amount of Al3+ and Pb2+ required 17.14 mL of 0.04907 M EDTA to reach the end point. A 50

dolphi86 [110]

Answer:

pAl³⁺ = 1,699

pPb²⁺ = 1,866

Explanation:

In this problem, the first titration with EDTA gives the moles of Al³⁺ and Pb²⁺, these moles are:

Al³⁺ + Pb²⁺ in 25,00mL = 0,04907M×0,01714L = 8,411x10⁻⁴ moles of EDTA≡ moles of Al³⁺ + Pb²⁺.

The molar concentration is 8,411x10⁻⁴ moles/0,02500L = 0,0336M Al³⁺+Pb²⁺.

In the second part each Al³⁺ reacts with F⁻ to form AlF₃. Thus, you will have in solution just Pb²⁺.

The moles added of EDTA are:

0,02500L×0,04907M = 1,227x10⁻³ moles of EDTA

The moles of EDTA in excess that react with Mn²⁺ are:

0,02064M × 0,0265L = 5,470x10⁻⁴ moles of Mn²⁺≡ moles of EDTA

That means that moles of EDTA that reacted with Pb²⁺ are:

1,227x10⁻³ moles - 5,470x10⁻⁴ moles = 6,800x10⁻⁴ moles of EDTA ≡ moles of Pb²⁺.

The molar concentration of Pb²⁺ is:

6,800x10⁻⁴mol/0,0500L = 0,0136 M Pb²⁺

Thus, molar concentration of Al³⁺ is:

0,0336M Al³⁺+Pb²⁺ - 0,0136 M Pb²⁺ = 0,0200M Al³⁺

pM is -log[M], thus pAl³⁺ and pPb²⁺ are:

pAl³⁺ = 1,699

pPb²⁺ = 1,866

I hope it helps!

3 0

3 years ago

Which is another word for 10 meters in the metric system?

kotegsom [21]

Answer:

Dekameter

Explanation:

8 0

3 years ago

The density of magnesium is 1.7/cm3, and the density of iron is 7.9g/cm3. Consider a block of iron with a mass of 819 g. What is

zepelin [54]

The density of magnesium is 1.7/cm3, and the density of iron is 7.9g/cm3. Consider a block of iron with a mass of 819 g. What is the mass of a block of magnesium that has the same volume as the block of iron?

3 0

3 years ago