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3 years ago

I need help with this! 1-4 please!

Chemistry

1 answer:

PolarNik [594]3 years ago

4 0

Answer:

1 = 1.203 L.

2 = 1.291 dg.

3 = 843.062 - 638.1848 = 204.8772

The answer consist of seven significant figures.

4= 123.0 × 8.43 = 1036.89

answer consist of six significant figures.

Explanation:

Q 1 = part 1

Convert the 1202.57120 mL into L

Both milliliter and litters are the unit of volume. Liter is larger unit while milliliter is the smaller unit. One liter is equal to the thousand milliliter. In order to convert the milliliter into liter we will divide the given value by thousand.

1202.57120 / 1000 = 1.2025712 L

By rounding the answer into four significant figures 1.203 L.

Q 1 = Part 2

Convert the 0.1290743 g into dg.

The gram and decigram are both the unit of mass. gram is larger unit decigram is smaller unit. one gram is equal to 10 dg. In order to convert the gram unto dg we will multiply the value with 10.

0.1290743 × 10 = 1.290743 dg

By rounding the answer into four significant figures 1.291 dg.

Q 1 = part 3

843.062 - 638.1848 = 204.8772

The answer consist of seven significant figures. The zero between the 2 and 4 is also a significant. If we have to round the answer in four significant figures the answer will be 204. 9.

Q 1 = part 4

123.0 × 8.43 = 1036.89

answer consist of six significant figures. if we round the answer into four significant figures then answer will be 1037.

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Calculate %ic of the interatomic bonds for the intermetallic compound al6mn. on the basis of this result, what type of interatom

pashok25 [27]

Answer : % ionic character is 0.20%

Bonding between the two metals will be purely metallic.

Explanation: For the calculation of % ionic character, we use the formula

$\% \text{ ionic character}= [1-e^{\frac{-(X_A-X_B)^2)}{4}}]\times(100\%)$

where $X_A$ & $X_B$ are the Pauling's electronegativities.

The table attached has the values of electronegativities, by taking the values of Al and Mn from there,

$X_{Al}=1.61$

$X_{Mn}=1.55$

Putting the values in the electronegativity formula, we get

$\% \text{ ionic character}= [1-e^{\frac{-(1.61-1.55)^2)}{4}}]\times(100\%)$

= 0.20%

Now, there are 3 types of inter atomic bonding

1) Ionic Bonding: It refers to the chemical bond in which there is complete transfer of valence electrons between atoms

2) Covalent Bonding: It refers to the chemical bond involving the sharing of electron pairs between 2 atoms.

3) Metallic Bonding: It refers to the chemical bond in which there is an electrostatic force between the positively charged metal ions and delocalised electrons.

In $Al_6Mn$ compound, the % ionic character is minimal that is $\sim$ 0.20% and there are two metal ions present, therefore this compound will have metallic bonding.

8 0

3 years ago

If the balloon had a volume of 3 L at a depth of 50 m, what was the original volume of the balloon it we assume the pressure at

disa [49]

If the balloon had a volume of 3 L at a depth of 50 m, the original volume of the balloon will be

<h3 /><h3>What is Significant figures ?</h3>

Significant figures are the number of digits in a value, often a measurement, that contribute to the degree of accuracy of the value.

The pressure at a depth of 40 m is the hydrostatic pressure of the water plus the atmospheric pressure.

The hydrostatic pressure P of a liquid is given by the formula ;

P = ρgh

where,

ρ = the density of the liquid (Density of water = 1000 kg m⁻³)
g = the acceleration due to gravity (9.81 ms⁻²)
h = the depth of the liquid (Given : 50 m)

P = 1000 kg m⁻³ x 9.81 ms⁻² x 50 m

= 1000 kg m⁻¹ x 9.81 s⁻² x 50

= 4.9 x 10⁵ Pa

Lets's Convert Pa in to atm

= 4.9 x 10⁵ Pa x 1 / 103. 325 x 10³ Pa

= 4.7 atm

Mow, lets calculate P(atm) ;

P(atm) = 14.7 psi x 1 atm / 14.7 psi

= 1 atm

Total Pressure at 50 m is ;

P(total) = 4.7 atm + 1 atm

= 5.7 atm

Now we can apply Boyle's Law to calculate the volume of the balloon at the surface.

P₁V₁ = P₂V₂

V₂ = P₁V₁ / P₂

According to the question ;

P₁ = 5.7 atm
P₂ = 1 atm
V₁ = 3 L
V₂ = ?

V₂ = 3 L x 5.7 atm / 1 atm

= 17.1 L

= 20 L ( 1 significant figure)

Learn more about Boyles law here ;

brainly.com/question/1437490

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8 0

2 years ago

Carbon disulfide, CS2, can be made from coke, C(s), and sulfur dioxide, SO2(g). C(s) + SO2(g) à CS2(s) + CO2(g) If the actual yi

Virty [35]

Answer:

450g of coke (C)

Explanation:

Step 1:

The balanced equation for the reaction is given below:

3C(s) + 2SO2(g) —> CS2(s) + 2CO2(g)

Step 2:

Determination of the mass of C that reacted and the mass of CS2 produced from the balanced equation.

This is illustrated below:

Molar Mass of C = 12g/mol

Mass of C from the balanced equation = 3 x 12 = 36g

Molar Mass of CS2 = 12 + (32x2) = 12 + 64 = 76g/mol.

From the balanced equation above, 36g of C reacted to produce 76g of CS2.

Step 3:

Determination of the mass of C required to produce 950g of CS2. This is illustrated below:

From the balanced equation above, 36g of C reacted to produce 76g of CS2.

Therefore, Xg of C will react to produce 950g of CS2 i.e

Xg of C = (36 x 950)/76

Xg of C = 450g

From the calculations made above, 450g of coke (C) is needed to produce 950g of CS2.

6 0

3 years ago

Please help!!! (im really bad at chemistry)

Lubov Fominskaja [6]

Answer:

1000ml/1L

Explanation:

8 0

3 years ago

Balanced Chemical Equation: 2H2(g)+O2(g)——> 2H2O(g)

Tcecarenko [31]

You must use 134 g O₂ to produce 118 g H₂O.

$\%\text{ yield} = \frac{\text{actual yield}}{\text{theoretical yield}} \times 100 \%$

$\text{Theoretical yield} = \text{Actual yield}\times \frac{100\%}{\%\text{ yield}} = \text{118 g }\times \frac{100 \%}{78.2 \%} = \text{150.9 g}$

M_r: 32.00 18.02

2H₂ + O₂ ⟶ 2H₂O

Moles of H₂O = 150.9 g H₂O × (1 mol H₂O/18.02 g H₂O) = 8.374 mol H₂O

Moles of O₂ = 8.374 mol H₂O × (1 mol O₂/2 mol H₂O) = 4.187 mol O₂

Mass of O₂ = 4.1877 mol O₂ × (32.00 g O₂/1 mol O₂) = 134 g O₂

6 0

3 years ago