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3 years ago

Plz solve the question and send the answer

Chemistry

2 answers:

Anton [14]3 years ago

6 0

64g of $\bold{CH_{3}OH => 44.8L }$

vapour density of $\small{\sf{CH_{3}3OH=\frac{mass}{volume} of } \bold{CH_{3}OH}}$

=64/44.8=10/7=1.43 g/l

Vapour density of $\bold{CH_{3}OH = 1.43 g/L}$

baherus [9]3 years ago

4 0

Answer:

64g of $\bold{CH_{3}OH}\dashrightarrow$ 44.8L

vapour density of $CH_{3}3OH=\frac{mass}{volume}$ of $\bold{CH_{3}OH}$

=64/44.8=10/7=1.43 g/l

Vapour density of $\bold{CH_{3}OH}$ =1.43g/l

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Coefficients in a chemical formula provide

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Answer:

The relative number of products and reactants

Explanation:

The numerical coefficients in chemical equations show the ratio of the molecules of each substance involved in a chemical reaction that is both reactants and products.
The coefficients in a balanced chemical equation indicate the relative number of moles of reactants and products.
Additionally, coefficients are important to prove the law of conservation of mass.

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3 years ago

What was J J Thomson contribution to the development of atomic structure

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3 years ago

Given that the molar mass of H2O is 18.02 g/mol, how many liters of propane are required at STP to produce 75 g of H2O from this

alukav5142 [94]

First, we require the combustion equation of propane:
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

We see that each mole of propane produces 4 moles of water.
Now, we calculate the moles of water required: 75 / 18.02
Moles required = 4.16
Moles of propane required for this are: 4.16 / 4 = 1.04 moles

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2 years ago

A 10 g sample of an unknown metal is cooled from 100 °C to 21.6 °C in a calorimeter of 100 g of water. The temperature of the wa

Marta_Voda [28]

Taking into account the definition of calorimetry, the specific heat of the unknown metal is 0.9 $\frac{J}{gC}$ and the metal is aluminum.

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).

So, the equation that allows to calculate heat exchanges is:

Q = c× m× ΔT

where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.

In this case, you know:

For unknown metal:

Mass of metal = 10 g
Initial temperature of metal= 100 °C
Final temperature of metal= 21.6 ºC
Specific heat of metal= unknown

For water:

Mass of water = 100 g
Initial temperature of water= 20 ºC
Final temperature of water= 21.6 ºC
Specific heat of water = 4.186 $\frac{J}{gC}$

Replacing in the expression to calculate heat exchanges:

For unknown metal: Qmetal= $c_{unknown metal}$ × 10 g× (21.6 C - 100 C)

For water: Qwater= 4.186 $\frac{J}{gC}$ × 100 g× (21.6 C - 20 C)

If two isolated bodies or systems exchange energy in the form of heat, the quantity received by one of them is equal to the quantity transferred by the other body. That is, the total energy exchanged remains constant, it is conserved.

Then, the heat that the gold gives up will be equal to the heat that the water receives. Therefore:

- Qmetal = + Qwater

- $c_{unknown metal}$ × 10 g× (21.6 C - 100 C)=4.186 $\frac{J}{gC}$ × 100 g× (21.6 C - 20 C)

Solving:

- $c_{unknown metal}$ × 10 g× (- 78.4 C)= 669.76 J

$c_{unknown metal}$ × 784 gC= 669.76 J

$c_{unknown metal}$ = 669.76 J÷ 784 gC

$c_{unknown metal}$ = 0.854 $\frac{J}{gC}$ ≅ 0.9 $\frac{J}{gC}$

Finally, the specific heat of the unknown metal is 0.9 $\frac{J}{gC}$ and the metal is aluminum.

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2 years ago

g .For each of the following disubstituted cyclohexanes, indicate whether the substituents in the two chair conformations would

Kryger [21]

Answer:

a) Both chairs conformers have one of its substituents in an axial position and the other in an equatorial position

b) One chair conformer has both its substituents in an axial position while the other chair has its substituents in an equatorial position

c) One chair conformer has both its substituents in an axial position while the other chair has its substituents in an equatorial position

d) Both chairs have one of its substituents in an axial position and the other in an equatorial position

e) Both chairs have one of its substituents in an axial position and the other in an equatorial position

(f) One chair conformer has both its substituents in an axial position while the other chair has its substituents in an equatorial position

Explanation:

Determine what the substituents would be

a) Cis-1,2- : Both chairs conformers have one of its substituents in an axial position and the other in an equatorial position

b) Trans-1,2- : One chair conformer has both its substituents in an axial position while the other chair has its substituents in an equatorial position

c) Cis-1,3- : One chair conformer has both its substituents in an axial position while the other chair has its substituents in an equatorial position

d) Trans-1,3- : Both chairs have one of its substituents in an axial position and the other in an equatorial position

e) Cis-1,4- : Both chairs have one of its substituents in an axial position and the other in an equatorial position

(f) Trans-1,4- : One chair conformer has both its substituents in an axial position while the other chair has its substituents in an equatorial position

7 0

2 years ago