It takes to break a carbon-iodine single bond. Calculate the maximum wavelength of light for which a carbon-iodine single bond could be broken by absorbing a single photon.

The percentage yield of copper = 76%

Given

6.5g of Zinc

The mass of Copper: 4.8 g

Required

The percentage yield of copper

Solution

Reaction

Zn+CuSO₄⇒Cu+ZnSO₄

mol Zn :

= mass : Ar Zn

= 6.5 g : 65,38 g/mol

= 0.0994

From the equation, mol ratio of Zn : Cu = 1 : 1, so mol Cu = 0.0994

Mass Cu (theoretical) :

= mol x Ar Cu

= 0.0994 x 63,546

= 6.316 g

%yield = (actual/theoretical) x 100%

%yield = (4.8/6.316) x 100%

%yield = 76%

Answer:

increases

and the 2nd one increases

Given

Lf=latent heat of fusion  of Al = 95 cal/g

Q = 1,265,730 cal

Required

mass of Aluminium

Solution

The heat to change the phase can be formulated :

Q = m.Lf (melting/freezing)

Input the value

1,265,730 cal = m . 95 cal/g

m = 1,265,730 cal : 95 cal/g

m = 13323.47 g

Answer:

1.510 × 10⁻¹³ g

Explanation:

Step 1: Given data

Number of atoms of vanadium: 1.000 × 10⁹ atoms

Step 2: Calculate the molecules of V₂O₅ that contain 1.000 × 10⁹ atoms of V

Each molecule of V₂O₅ has 2 atoms of V.

1.000 × 10⁹ atom V × (1 molecule V₂O₅/2 atom V) = 0.5000 × 10⁹ molecule V₂O₅

Step 3: Calculate the moles corresponding to 0.5000 × 10⁹ molecules of V₂O₅

We will use Avogadro's number: there are 6.022 × 10²³ molecules of V₂O₅ in 1 mole of V₂O₅.

0.5000 × 10⁹ molecule × (1 mol/6.022 × 10²³ molecule) = 8.303 × 10⁻¹⁶ mol

Step 4: Calculate the mass corresponding to 8.303 × 10⁻¹⁶ moles of V₂O₅

The molar mass of V₂O₅ is 181.88 g/mol.

8.303 × 10⁻¹⁶ mol × 181.88 g/mol = 1.510 × 10⁻¹³ g

Answer:

Number of moles of water = 210 mol

Explanation:

Given data:

Mass of water = 3780 g

Number of moles of water = ?

Solution:

Formula:

Number of moles = mass/molar mass

Molar mass of water = 18 g/mol

Number of moles = 3780 g/ 18 g/mol

Number of moles of water = 210 mol

Answer:

I think the answer is true

The volume of concentrated HCl : 2.073 ml

Given

37% HCl by mass; density 1.19 g/mL

Required

The volume of concentrated HCl

Solution

Conversion to molarity :

37% x 1.19 g/ml =0.4403 g/ml

g/ml to mol/L :

=0.4403 g/ml x 1000 ml/L : 36.5 g/mol

=12.06 mol/L

or we can use formula :

[tex]\tt M=\dfrac{\%\times \rho\times 10}{MM}\\\\M=\dfrac{37\times 1.19\times 10}{36.5}\\\\M=12.06[/tex]

Dilution formula :

M₁V₁=M₂V₂

12.06 M x V₁ = 0.1 M x 0.25 L

V₁ = 0.0021 L = 2.073 ml

Explanation:

b and c statements are not true

if it helps you then plzz mark me brainliest

Answer:

B.) Smoking improves Athletic performance

Explanation:

Answer:

yes

Explanation:

its not that hard to get

Answer:

63.7g BaCl₂

Explanation:

Based on the chemical reaction:

2HCl + Ba(OH)₂ → BaCl₂ + 2H₂O

2 moles of HCl reacts per mole of barium hydroxide

To solve this question, we need to convert the moles of each reactant to moles and, using the chemical reaction, find limiting reactant as follows:

Moles Ba(OH)₂ - Molar mass: 171.34g/mol-

52.4g Ba(OH)₂ * (1mol / 171.34g) = 0.306 moles Ba(OH)₂

Moles HCl - Molar mass: 36.46g/mol-

25.6g HCl * (1mol / 36.46g) = 0.702 moles HCl

For a complete reaction of 0.702 moles HCl are required:

0.702 moles HCl * (1mol Ba(OH)₂ / 2mol HCl) = 0.351 moles of Ba(OH)₂

As there are just 0.306 moles, limiting reactant is Ba(OH)₂

That means the maximum amount of BaCl₂ produced is:

0.306 moles Ba(OH)₂ * (1mol BaCl₂ / 1 mol Ba(OH)₂) = 0.306 moles BaCl₂

In mass -Molar mass BaCl₂: 208.23g/mol-

0.306 moles BaCl₂ * (208.23g / mol) = 63.7g BaCl₂

The name of a molecule which is composed of two phosphorous atoms and four sulfur atoms is phosphorus sulphide.

According on the context, the word may or may not include ions that meet this requirement. A molecule is a collection of two or more atoms bound together by attractive forces known as chemical bonds.

A molecule is the smallest unit of any material that is composed of one or more elements and is capable of existing independently while maintaining all of the substance's physical and chemical characteristics. Further atom division occurs within molecules. For instance, the symbols for the oxygen atom and molecule are O and O2, respectively.

Thus, The name of a molecule which is composed of two phosphorous atoms and four sulfur atoms is phosphorus sulphide.

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Answer: The lewis dot structure is attached below.

Explanation:

A Lewis dot structure is defined as the representation of atoms having electrons around the atom where electrons are represented as dots.

A ketene is an organic compound having general formula R′R″C=C=O, where R and R' are two different/same monovalent chemical groups.

The given chemical compound having formula [tex]C_2H_2O[/tex] is represented as [tex]H_2-C=C=O[/tex].

Total number of unshared electrons = 4 (left on oxygen atom only)

The lewis dot structure of [tex]C_2H_2O[/tex] is given in the image below.

Explanation:

Fe. O

72.40/ 56 27.60/16

____________________

1.29/1.29 1.725/1.29

_____________________

1. :. 1

Empirical formula is the whole number ratios of elements in a compound. It can be found from the number of moles. The empirical formula of iron and oxygen of 72.4 % and 27.6 % respectively is Fe₂O₃.

Empirical formula of a compound is the chemical formula derived from the number of moles each element present in it.  Whereas, molecular formula is derived from the actual masses of the elements present in the compound.

Empirical formula can be determined from the number of moles of the elements. It is given that the mass percentages of iron and oxygen are 72.40% and 27.60% respectively. This can be taken as 72.40 g and 27.60 g in a 100 g of compound.

Thus there is 72.40 g of iron. The atomic mass of Fe = 55.85 g/mol

Thus number of moles of Fe = 72.40 / 55.85

                                               = 1.295

The weight of oxygen in 100 g of compound is 27.60 g. Atomic mass of oxygen is 16 g/mol.

Thus number of moles of oxygen = 27.60 /16 = 1.725

Taking the ratios of these number of moles = 1.295 :1.725 = 2 :3

Hence, the ratios of iron to oxygen is 2:3 which means the empirical formula of the compound is Fe₂O₃.

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Answer:

D. Atoms are changed into new elements.

Explanation:

atoms rearrange to form one or more different substances.

Hope that helps!!!

Sorry if its worng :(

Answer:

It's actually C. Energy is given off or absorbed.

Explanation:

"All chemical reactions involve changes in energy. This may be a change in heat, electricity, light, or other forms of energy. Reactions that absorb energy are endothermic. Reactions that release energy are exothermic."

-LibreTexts Chemistry

Answer:

It would be the last one because the way earth is tilted the sun rays would be pointing at the Northern Hemisphere more than the Southern Hemisphere

Answer:

= 14.63 × [tex]10^{45}[/tex] particles.

Explanation:

According to Avogadro's priciple:

1 mole of any substance is 6.02 × [tex]10^{23}[/tex] particles

∴ 2.43 x [tex]10^{24}[/tex] moles × 6.02 × [tex]10^{23}[/tex]

= 14.63 × [tex]10^{45}[/tex] particles.

I hope this was clear and easy to understand.

Answer:

Transition elements are present in this region.

Explanation:

Answer:

true

Explanation:

calculating the average atomic

Answer:

The answer is D.

Explanation:

Given that velocity also applies speed formula, S = D ÷ T where D represents distance and T is time :

S = D ÷ T

S = 100m ÷ 25s

S = 4m/s

V = 4m/s east

The difference between speed and velocity is that speed has only magnitude but velocity has magnitude and direction.

Answer: increase the bicycles acceleration hope this helps :]

Explanation:

Answer:

0.004 m/s

Explanation:

Given data:

Distance traveled = 23 m

Time taken = 5289 s

Speed of bike = ?

Solution:

Formula:

speed = distance / time

b y putting values,

speed = 23 m/ 5289 s

speed = 0.004 m/s

Answer:

21

Explanation:

To find the total atoms.

Multiply 3 *2 and you will get 6

Then multiply 3 * 5 and you will get 15.

You do this because there is 3 as a coefficient and is before the chemical compound. Furthermore, that means the same thing as a parenthesis.

Last of all, add 15 + 6 and you will get 21.

Therefore, there are a total of 21 atoms.

Answer: [tex]K_2SO_4(aq)+2NaOH(aq)\rightarrow Na_2SO_4(aq)+2KOH(aq)[/tex]

Explanation:

A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.  

The balanced chemical equation is:

[tex]K_2SO_4(aq)+2NaOH(aq)\rightarrow Na_2SO_4(aq)+2KOH(aq)[/tex]