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stealth61 [152]
3 years ago
8

Which of the following compounds most likely has the least bond energy?

Chemistry
1 answer:
Evgesh-ka [11]3 years ago
4 0

Answer:

I2; I–I bond length = 266 pm

Explanation:

Bond length is inversely related to bond strength. The longer the bond length, the weaker the bond. The shorter the bond length the stronger the bond. A large bond distance implies that there is poor interaction between the atoms involved in the bond. A long bond distance or bond length may even indicate the absence of covalent interaction between the atoms involved.

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If the reaction of 3.50 moles of lithium with excess hydrofluoric acid produced a 75.5% yield of hydrogen gas, what was the actu
melomori [17]

<u>Answer: </u>The correct answer is 1.32 mol H_2

<u>Explanation:</u>

For the reaction of lithium and hydrofluoric acid, the equation follows:

2Li+2HF\rightarrow 2LiF+H_2

By Stoichiometry of the reaction:

if 2 moles of lithium is producing 1 mole of hydrogen gas,

Then, 3.50 moles of lithium will produce = \frac{1}{2}\times 3.5=1.75mol of hydrogen gas.

  • Now, to know the theoretical yield of hydrogen gas, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}   ...(1)

Moles of hydrogen gas = 1.75 mol

Molar mass of hydrogen gas = 2 g/mol

Putting values in above equation, we get:

1.75mol=\frac{\text{Mass of hydrogen gas}}{2g/mol}\\\\\text{Given mass of hydrogen gas}=3.5gl

  • To calculate the percentage yield, we use the equation:

\%\text{ yield}=\frac{\text{Actual yield}}{\text{Theoretical yield}}\times 100

Percentage yield = 75.5 %

Theoretical yield = 3.5 g

Putting values in above equation, we get:

75.5=\frac{\text{actual yield}}{3.5g}\times 100\\\\\text{Actual yield}=2.64g

  • Now, calculating the moles of hydrogen gas, we put the value in equation 1, we get:

\text{Moles of hydrogen gas produced}=\frac{2.64g}{2g/mol}=1.32mol

Hence, the correct answer is 1.32 mol H_2

5 0
3 years ago
Read 2 more answers
How many moles are in 281 g of Ca(OH)2?
Natasha_Volkova [10]

Answer:

3.79 moles

Explanation:

To convert moles to gams of a substance we need to find the molar mass of the substance. For Ca(OH)₂ th molar mass is:

1Ca = 40.08g/mol

2O = 2*16g/mol = 32g/mol

2H = 2*1.01g/mol = 2.02g/mol

The molar mass is:

40.08g/mol + 32g/mol + 2.02g/mol = <em>74.1g/mol</em>

<em />

And moles are:

281g * (1mol / 74.1g) =

<h3>3.79 moles</h3>
5 0
3 years ago
A. How many moles of copper equal 8.00 × 109 copper atoms?
BARSIC [14]

Answer:

Explanation:

a ) one mole = 6.02 x 10²³ atoms

no of moles in given no of atoms

= 8 x 10⁹ / 6.02 x 10²³

= 1.329 x 10⁻¹⁴ moles .

b ) one mole of calcium = 40 gram

102 .5 g calcium

= 102 .5 / 40 moles

= 2.5625 moles

c )

no of moles in 5.04 g lead = 5.04 / 207

= 2.4347 x 10⁻² moles

= 2.4347 x 10⁻²x 6.02 x 10²³ no of atoms of lead

= 14.6568 x 10²¹ no of atoms .

d)  

one mole = 6.02 x 10²³ atoms

2.85 mole = 17.157 x 10²³ atoms .

e )

moles of fluorine gas = 1.08 x 10³ / 6.02 x 10²³

= .1794 x 10⁻²⁰ moles

mass in grams =  .1794 x 10⁻²⁰ x 38

= 6.8172 x 10⁻²⁰ grams

f )

no of moles in .584 g of benzene = .584 / 78

= 7.487 x 10⁻³ moles

no of molecules = 6.02 x 10²³ x  7.487 x 10⁻³

= 45.07 x 10²⁰ molecules .

g )

moles of atoms = 5.09 x 10⁹ / 6.02 x 10²³

= .8455 x 10⁻¹⁴ moles

mass in gram = .8455 x 10⁻¹⁴ x 1

=  .8455 x 10⁻¹⁴ g

h )

.45 moles of Ca₃PO₄ = .45 x 6.02 x 10²³ molecules

= 2.709 x 10²³ molecules of Ca₃PO₄

no of atoms of Ca = 3 x 2.709 x 10²³

= 8.127 x 10²³ atoms of Ca .

7 0
3 years ago
How many moles of sulfur dioxide are produced with 6.0 mols of carbon dioxide?
kodGreya [7K]

Answer:

228.38g of CO2

Explanation:

6 0
2 years ago
Which of the following is a unit for volume?<br> m3<br> km<br> cg<br> dkm
babymother [125]
M³ is a unit for volume.
8 0
3 years ago
Read 2 more answers
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