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3 years ago

10. When a substance is analyzed using an electron microscope, it is found

Chemistry

1 answer:

Paraphin [41]3 years ago

7 0

A an element gn BBC dfhjhhgdsdgghh

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Consider the following reaction: A2 + B2 → 2AB ΔH = –321 kJ Bond energy (A2) = 1/2AB Bond energy (B2) =393 kJ/mol. What is the n

nirvana33 [79]

Answer: The numerical value for Bond energy of $A_2$ is -238 kJ/mol

Explanation:

The balanced chemical reaction is,

$A_2+B_2(g)\rightarrow 2AB$ $\Delta H=-321kJ$

The expression for enthalpy change is,

$\Delta H=\sum [n\times B.E(reactant)]-\sum [n\times B.E(product)]$

$\Delta H=[(n_{A_2}\times B.E_{A_2})+(n_{B_2}\times B.E_{B_2}) ]-[(n_{AB}\times B.E_{AB})]$

$\Delta H=[(1\times x)+(1\times B.E_{B_2}) ]-[(2\times 2x)]$

where,

n = number of moles

If $B.E_{A_2}=x$ $B.E_{AB}=2x$

Now put all the given values in this expression, we get

$-321=[(1\times x)+(1\times 393)]-[(2\times 2x)]$

$x=-238kJ/mol$

Therefore, the bond energy of $A_2$ is -238 kJ/mol

6 0

3 years ago

1 example of o neutral

katrin [286]

Answer:

NaCl and CO are two neutral compounds as well as these are popular and these Neutral substances are those which have a pH of 7 even they are neither acidic nor basic. The substances which are neither acidic, nor basic and these are called neutral substance. For example distilled water, sugar solution etc. 3.9. 17 votes.

Explanation:

5 0

4 years ago

Which temperature is equal to 120. K? (1) -153°C (3) +293°C (2) -120.°C (4) +393°C

Marysya12 [62]

First of all, the formula for finding Kelvin is Celsius + 273
Therefore, if we subtract 273, we get the temperature in degrees
120 - 273 = - 153

Therefore, the answer is (1), or -153 degrees Celsius

Hope this helped!! :D

3 0

3 years ago

How many atoms of hydrogen are in 0.500 mol of ch3oh molecules?

cestrela7 [59]

In 1 mol of CH3OH, you have 4 H-atoms (because 3 H-atoms are attached to the C-atom, and one H-atom in the OH group). That means in 0.500 mol of CH3OH, you have 2 H-atoms since it is halved. And then we have Avogadro's constant: 6.02 * 1023.

The question asks for how many hydrogen atoms there are in 0.500 mol CH3OH. Using the numbers that we have (Avogadro's constant and no. of H-atoms), the answer of the question will be something like:

H-atoms in CH3OH = 2 * 6.02 * 1023 = ~1.2 * 1024

8 0

3 years ago

CHEMISTRY:There are 9 rotons & 11 neutrons. What is the atomic number & atomic mass?

ziro4ka [17]

Hey there!

Atomic number is the number of protons.

Atomic mass is the sum of protons and neutrons.

9 + 11 = 20

Your answer is B) The atomic number is 9 & the atomic mass is 20.

Hope this helps!

5 0

3 years ago