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3 years ago

Guys please help me...

Chemistry

1 answer:

valentina_108 [34]3 years ago

7 0

Answer:

On the farm there are 70 chickens.

Explanation:

We can directly work out the number of ducks from the given number of pigs, with the ratio of ducks to pigs:

36 pigs * $\frac{5Ducks}{9Pigs}$ = 20 ducks

Then we work out the number of chickens, using the ration of chickens to ducks:

20 ducks * $\frac{7Chickens}{2Ducks}$ = 70 chickens

If on the farm there are 36 pigs, there are 70 chickens as well.

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Solve the 3 questions

Dmitrij [34]

Answer:

what kind of math is this

Explanation:

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3 years ago

uch Activity 2 - Look at Me Directions: Given the illustrations below, tell whether it is a homogeneous mixture or heterogeneous

VARVARA [1.3K]

Answer:

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3 years ago

Read 2 more answers

Outline the steps needed to determine the limiting reactant when 30.0 g of propane, C3H8, is burned with 75.0 g of oxygen.

kumpel [21]

Answer : The limiting reactant is $O_2$

Explanation : Given,

Mass of $C_3H_8$ = 30.0 g

Mass of $O_2$ = 75.0 g

Molar mass of $C_3H_8$ = 44 g/mole

Molar mass of $O_2$ = 32 g/mole

First we have to calculate the moles of $C_3H_8$ and $O_2$ .

$\text{ Moles of }C_3H_8=\frac{\text{ Mass of }C_3H_8}{\text{ Molar mass of }C_3H_8}=\frac{30.0g}{44g/mole}=0.682moles$

$\text{ Moles of }O_2=\frac{\text{ Mass of }O_2}{\text{ Molar mass of }O_2}=\frac{75.0g}{32g/mole}=2.34moles$

Now we have to calculate the limiting and excess reagent.

The balanced chemical reaction is,

$C_3H_8+5O_2\rightarrow 3CO_2+4H_2O$

From the balanced reaction we conclude that

As, 5 mole of $O_2$ react with 1 mole of $C_3H_8$

So, 2.34 moles of $O_2$ react with $\frac{2.34}{5}\times 1=0.468$ moles of $C_3H_8$

From this we conclude that, $C_3H_8$ is an excess reagent because the given moles are greater than the required moles and $O_2$ is a limiting reagent and it limits the formation of product.

Therefore, the limiting reactant is $O_2$

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3 years ago

What is the oxidation number of Pt in K₂PtCl₆?

Agata [3.3K]

Answer:

the oxidation number of Pt in K₂PtCl₆ is 4.

K₂PtCl₆=0

2+x-6=0

x=4

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3 years ago

Two students are given different samples of a substance and are instructed to determine the properties of the substance.

Hunter-Best [27]

The complete question is given below:

Two students are given different samples of a substance and are instructed to determine the properties of the substance.

Which statement describes a property that will be the same for both students?

A. color because it is an extensive property

B. mass because it is an extensive property

C. boiling point because it is an intensive property

D. volume because it is an intensive property .

ANSWER

The correct option is C.

The physical properties of substances are divided into two, intensive and extensive properties.

Intensive properties refers to those features of a substance that do not depend on the quantity of the material that is available. Whether the sample available is big or small, the intensive properties remain the same. Examples of intensive properties are: melting point, boiling point, refractive index, hardness, density color, etc. This question is asking us to look for an intensive property.

Extensive properties refers to those characteristics of a substance that depend on the amount of substance present. Examples of these properties are: mass, volume, size, weight, length, etc.

From the options given, option A is wrong because color is not an extensive property, it is intensive. Option B is wrong because the mass depend on the amount of sample given and the same thing apply to option D.

The correct option is C, because no matter the quantity of that substance that you have, the boiling point will always remains the same.

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4 years ago