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3 years ago

How many moles of hydrogen gas(H2) are needed to react with 15 moles of chlorine gas

Chemistry

1 answer:

NNADVOKAT [17]3 years ago

4 0

Answer:

15 moles of hydrogen gas are needed to react with 15 moles of chlorine gas.

Explanation:

The balanced reaction is:

H₂ (g) + Cl₂ (g) → 2 HCl (g)

By stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of the compounds participate in the reaction:

H₂: 1 mole
Cl₂: 1 mole
HCl: 2 moles

Then you can apply the following rule of three: If 1 mole of Cl₂ reacts with 1 mole of H₂, 15 moles of Cl₂ with how many moles of H₂ does it react?

$moles of H_{2} =\frac{15 moles of Cl_{2} *1mole of H_{2}}{1moles of Cl_{2}}$

moles of H₂= 15

15 moles of hydrogen gas are needed to react with 15 moles of chlorine gas.

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A student touches a freshly baked cake that was taken out of the oven. Which best explains why the cake feels hot? Options: Mole

chubhunter [2.5K]

Answer:

Molecules in the cake are moving faster than molecules in the skin.

Explanation:

When a cake is baked, the energy is absorbed. This is known as an endothermic reaction. When things are hot, it means that the molecules are in motion. When the cake is taken out from the oven, the molecules are continuously moving and absorbing energy. When the student touches the cake, the heat is flown into the student's body. This happens because of the difference in the temperature between the two.

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3 years ago

Suppose that an element has two isotopes. The average atomic mass of the element is 45.737 u . One isotope has a mass of 40.149

Ugo [173]

Answer:

The answer to your question is 49.08 u

Explanation:

Data

Average atomic mass = 45.737 u

Isotope 1 = 40.149 u abundance = 37.46%

Isotope 2 = ?

Process

1.- Calculate the abundance of isotope 2

abundance isotope 1 + abundance isotope 2 = 100%

37.46 + abundance isotope 2 = 100

abundance isotope 2 = 100 - 37.46

abundance isotope 2 = 62.54

2.- Calculate the mass of isotope 2

Average atomic mass = (abundance x mass isotope 1) + (abundance x

mass isotope 2)

45.737 = (0.3746 x 40.149) + (62.54 x mass isotope 2)

mass isotope 2 = [45.737 - (0.3746 x 40.149)]/ 62.54

mass isotope 2 = [45.737 - 15.0398]/ 62.54

mass isotope 2 = 30.6972/62.54

mass isotope 2 = 0.4908 x 100

mass isotope 2 = 49.08 u

7 0

3 years ago

Two scientists work together on an experiment, but they have different hypotheses. When the scientists look at the experimental

ioda

Answer:

When experiments are carried out or research is done in a certain field of knowledge the scientist at first hypothesise certain knowledge or make theoretical hypotheses about that field of knowledge.

And then conduct the experiment or research to derive certain conclusions and get answers which they can apply on the hypothesis made or on the previous knowledge they have and thereby confirm or negate the hypothesis.

When two scientists are working on similar experiment and they tend to differ in the conclusions drawn by the result, as they get from experiment then it is called as confirmation bias among the scientists.

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3 years ago

Some chemical changes can be ______________ through another _______________ change.

zalisa [80]

Some chemical changes can be reactive through another chemical change?

3 0

3 years ago

A gas sealed in a drum container occupies 7.70 L at a sizzling 325C degrees. What will the volume be if the drum is quickly chi

grigory [225]

The volume of the drum after chilled quickly is 3.6 L.

Explanation:

As per the Charles Law, for any gas at constant pressure, volume of the gas is in direct proportion with the temperature measured in Kelvin. As the temperature increases, the gas expands and vice versa.

$$\frac{V1}{T1} = \frac{V2}{T2} \\$

After chilling the drum, the volume will get reduced and it can be found as,

V2 = $$\frac{V1T2}{T1}$

= $$\frac{7.7 L \times 282 K}{598 K}$

= 3.6 L

Here the drum is chilled quickly, that is temperature is reduced and so the volume also decreases.

3 0

3 years ago