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3 years ago

How is hess's law applied in calculating enthalpy

Chemistry

2 answers:

Naddik [55]3 years ago

7 0

Answer: To develop a strategy for the order in which you add the various equations.

Explanation:

In a Hess’s Law problem, you have to develop a strategy for the order in which you add the various equations. hope this helps <3

eimsori [14]3 years ago

3 0

Answer:Hess's law states that the change of enthalpy in a chemical reaction (i.e. the heat of reaction at constant pressure) is independent of the pathway between the initial and final states. ... Hess's law allows the enthalpy change (ΔH) for a reaction to be calculated even when it cannot be measured directly.

Explanation:

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3 years ago

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worty [1.4K]

Answer:

The Machine exerts a force of 9N.

Explanation:

Initial velocity (u) = 0 m/s

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Time (t) = 0.5 s

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2 years ago

To separate a mixture of hard candies and marbles, the most efficient method would be

frozen [14]

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4 years ago

Read 2 more answers

Which of the following substances are likely to be soluble in water?

hram777 [196]

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4 years ago

The different unit cell types have a different packing efficiency. The simple cubic has the least efficient packing and the face

kozerog [31]

Answer:

The answer is "52.8".

Explanation:

Please find the graph file in the attachment.

They have the atoms in 8 corners with one unit cell in an one so mesh (SCC).

Atoms throughout the corner contribute $\frac{1}{8}$ to both the cell unit

Atom number per SCC unit cell, $Z = (8 \times \frac{1}{8}) = 1$

Let 'r' become the atom's radius. $r = 3.43\times 10^{-8}\ \ cm$

We can see from the diagram that edge length $AB = a = 2r$

$Packing\ efficiency = \frac{(1 \ atom \ Volume \times Z)}{Volume \ of \ unit\ cell \times 100}\\\\$

$= \frac{\frac{4}{3}\times \pi \times r^3 \times 1}{a^3 \times 100}\\\\=\frac{\frac{4}{3}\times \pi \times r^3 \times 1}{(2r)^3 \times 100} \\\\=\frac{\frac{4}{3}\times \pi \times( 3.43\times 10^{-8}cm)^3 \times 1}{(2\times 3.43\times 10^{-8}cm)^3 \times 100}\\\\= 52.8 \%$

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3 years ago