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3 years ago

Explanation and answer and you’ll get brain list

Chemistry

1 answer:

Flura [38]3 years ago

5 0

Answer:

Option B.

Explanation:

2Pb(NO₃)₂ → 2PbO + 4NO₂ + O₂

First we convert 9.90 g of Pb(NO₃)₂ into moles, using its molar mass:

9.90 g ÷ 331.2 g/mol = 0.0299 mol Pb(NO₃)₂

Then we convert moles of Pb(NO₃)₂ into moles of PbO, using the stoichiometric coefficients:

0.0299 mol Pb(NO₃)₂ * $\frac{2molPbO}{2molPb(NO_3)_2}$ = 0.0299 mol PbO

Now we convert 0.0299 mol PbO into grams, using its molar mass:

0.0299 mol PbO * 223.2 g/mol = 6.67 g PbO

So 6.67 g is the theoretical yield. With that in mind we calculate the percent yield:

% yield = 5.51 / 6.67 * 100 % = 82.6%

So the correct answer is option B.

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Which example is a container holding a heterogeneous mixture? * 1 point Bowl of clear chicken broth. Balloon filled with He gas.

Margarita [4]

Answer:

Bowl of clear chicken broth

Explanation:

A bowl of clear chicken broth is a heterogenous mixture.

A heterogenous mixture is one in which the constituents exists in at least two different phases.
A chicken broth is a heterogenous mixture which exists in the liquid - solid state.
The broth is made up of simmered meat, vegetables and other recipes together.

Such mixtures can be:

Gas - liquids mixtures
Liquid - solid mixtures
Gas - solid mixtures

A broth is an extract from cooking chicken. Some vegetables and extract are mixed together in a nutritious blend.

6 0

3 years ago

Design and implement a program (name it SumValue) that reads three integers (say X, Y, and Z) and prints out their values on sep

rjkz [21]

Answer:

class sum (

public static void sumofvalue (int m, int n, int p)

{

System.out.println(m);

System.out.println(n);

System.out.println(p);

int SumValue=m+n+p;

System.out.println("Average="+Sumvalue/3);

}

)

Public class XYZ

(

public static void main(String [] args)

{

sum ob=new sum();

int X=3;

int X=4;

int X=5;

ob.sumofvalue(X,Y,Z);

int X=7;

int X=8;

int X=10;

ob.sumofvalue(X,Y,Z);

}

)

Explanation:

The above program is made in Java, in which first we have printed value in a separate line. After that, the average value of those three values has been printed according to the question.

The processing of the program is given below in detail

* The first one class named 'sum' has been created which contains the function to print individual value and the average of those three values.

* In seconds main class named 'XYZ', the object of that the above class had been created which call the method of the above class to perform functions.

* In the main class values are assigned to variables X, Y, Z.

3 0

3 years ago

The currently accepted model of the atom includes an electron cloud. A. True B. False

natulia [17]

Answer:

True

Explanation:

4 0

3 years ago

Read 2 more answers

What is the function of the digestive system? why is it important to the body?

tangare [24]

The digestive system is made up of the gastrointestinal tract—also called the GI tract or digestive tract—and the liver, pancreas, and gallbladder. The GI tract is a series of hollow organs joined in a long, twisting tube from the mouth to the anus. The hollow organs that make up the GI tract are the mouth, esophagus, stomach, small intestine, large intestine, and anus. The liver, pancreas, and gallbladder are the solid organs of the digestive system.

The small intestine has three parts. The first part is called the duodenum. The jejunum is in the middle and the ileum is at the end. The large intestine includes the appendix, cecum, colon, and rectum. The appendix is a finger-shaped pouch attached to the cecum. The cecum is the first part of the large intestine. The colon is next. The rectum is the end of the large intestine.

Digestion is important because your body needs nutrients from food and drink to work properly and stay healthy. Proteins, fats, carbohydrates, vitamins NIH external link, minerals NIH external link, and water are nutrients. Your digestive system breaks nutrients into parts small enough for your body to absorb and use for energy, growth, and cell repair.

Proteins break into amino acids
Fats break into fatty acids and glycerol
Carbohydrates break into simple sugars

Each part of your digestive system helps to move food and liquid through your GI tract, break food and liquid into smaller parts, or both. Once foods are broken into small enough parts, your body can absorb and move the nutrients to where they are needed. Your large intestine absorbs water, and the waste products of digestion become stool. Nerves and hormones help control the digestive process.

7 0

3 years ago

Help Pleaseee!

bija089 [108]

Protons + and electrons - must be equal

3 moles of C has a mass of 36, 3 moles of He is 12

so the answer is :
The carbon sample would have three times the mass of the helium sample

hope this helps

6 0

3 years ago

Read 2 more answers