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3 years ago

Is the heat required to convert 1 gram

Chemistry

2 answers:

Dmitriy789 [7]3 years ago

8 0

Answer:

80 cal · Answer · Solution Heat required = Mass of ice [latent heat of fusion + 8 profit of heat × temp change + Latent heat of boiling ] ⇒ΔH=1g[Lf+8(ΔT)+Lv] ΔH ...

Explanation:

Alchen [17]3 years ago

8 0

Answer:

Explanation:

The enthalpy of fusion of a substance, also known as heat of fusion is the change in its enthalpy resulting from providing energy, typically heat, to a specific quantity of the substance to change its state from a solid to a liquid, at constant pressure.

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A student inflates a balloon with helium then places it in the freezer. The student should expect

g100num [7]

Answer:

The frozen balloon shrank because the average kinetic energy of the gas molecules in a balloon decreases when the temperature decreases. This makes the molecules move more slowly and have less frequent and weaker collisions with the inside wall of the balloon, which causes the balloon to shrink a little.

Explanation:{ BOOM}***

6 0

3 years ago

From the data table given, calculate the missing quantity

ololo11 [35]

<u>Answer:</u> The initial volume of the gas is 16.55 mL

<u>Explanation:</u>

To calculate the final temperature of the system, we use the equation given by Charles' Law. This law states that volume of the gas is directly proportional to the temperature of the gas at constant pressure.

Mathematically,

$\frac{V_1}{T_1}=\frac{V_2}{T_2}$

where,

$V_1\text{ and }T_1$ are the initial volume and temperature of the gas.

$V_2\text{ and }T_2$ are the final volume and temperature of the gas.

We are given:

$V_1=?mL\\T_1=300K\\V_2=16mL\\T_2=290K$

Putting values in above equation, we get:

$\frac{V_1}{300K}=\frac{16mL}{290K}\\\\V_1=\frac{16\times 300}{290}=16.55mL$

Hence, the initial volume of the gas is 16.55 mL

4 0

4 years ago

A molecule is known to have a molar absorptivity of 18,650 at a certain wavelength. A spectrometer is tuned to this wavelength a

iren2701 [21]

Answer:

17,932.69 g/mol is the molecular weight of the substance.

Explanation:

Using Beer-Lambert's law :

Formula used :

$A=\epsilon \times c\times l$

where,

A = absorbance of solution = 1.04

c = concentration of solution =?

l = length of the cell = 1 cm

$\epsilon$ = molar absorptivity of this solution = 18,650 $M^{-1} cm^{-1}$

Now put all the given values in the above formula, we get the molar absorptivity of this solution.

$1.04=18,650 M^{-1} cm^{-1}\times c)\times (1cm)$

c = $5.576\times 10^{-5} M$

$Concentration=\frac{\text{Mass of compound}}{\text{Molecular mass of compound}\times V}$

V = Volume of the solution in L

Molecular weight of the substance = x

V = 100 mL = 0.1 L

Mass of the substance = 100 mg = 0.1 g

$5.576\times 10^{-5} M=\frac{0.1 g}{x\times 0.1 L}$

x = 17,932.69 g/mol

17,932.69 g/mol is the molecular weight of the substance.

6 0

3 years ago

For an endothermic reaction at equilibrium, the addition of a catalyst

Tatiana [17]

Answer:

causes no shift

Explanation:

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3 years ago

Select all that apply. Which of the following are characteristics of acids?

denpristay [2]

Answer:

In the case of the compounds known as acids, the common characteristics include a sour taste, the ability to change the color of the vegetable dye litmus to red, and the ability to dissolve certain metals and simultaneously produce hydrogen gas.Aug 6, 2017

Explanation:

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3 years ago