Chemistry High School

Give me a hand，Solve this problem，Need everyone's help​

Give Me A HandSolve This ProblemNeed Everyone's Help

Answers

Answer 1

Answer:

A. 8.8 g.

B. 5.3 g.

C. 449 g.

Explanation:

A. Determination of the mass of CO2.

Mole of CO2 = 0.2 mole

Molar mass of CO2 = 12 + (2×16)

= 12 + 32

= 44 g/mol

Mass of CO2 =?

Mole = mass /Molar mass

0.2 = mass of CO2 /44

Cross multiply

Mass of CO2 = 0.2 × 44

Mass of CO2 = 8.8 g

B. Determination of the mass of Na2CO3.

Mole of Na2CO3 = 0.05 mole

Molar mass of Na2CO3 = (2×23) + 12 + (3×16)

= 46 + 12 + 48

= 106 g/mol

Mass of Na2CO3 =?

Mole = mass /Molar mass

0.05 = mass of Na2CO3 /106

Cross multiply

Mass of Na2CO3 = 0.05 × 106

Mass of Na2CO3 = 5.3 g

C. Determination of the mass of Fe(OH)2.

Mole of Fe(OH)2 = 5 moles

Molar mass of Fe(OH)2 = 55.8 + 2(16 + 1)

= 55.8 + 2(17)

= 55.8 + 34

= 89.8 g/mol

Mass of Fe(OH)2 =?

Mole = mass /Molar mass

5 = mass of Fe(OH)2/89.8

Cross multiply

Mass of Fe(OH)2 = 5 × 89.9

Mass of Fe(OH)2 = 449 g.

Related Questions

Two objects are moving in a straight line. One object has a faster speed than the other. They both have constant speeds (speed is not changing). Is either object accelerating? ​

Answers

Answer:

No

Explanation:

Acceleration refers to the increase in speed over time. Since both of the objects are moving at a constant speed (so the speed is not changing) neither are accelerating, because acceleration requires a positive change in speed.

They may be moving at different speeds, one faster than the other, but neither are changing their own speed so neither are accelerating.

Hope this helped!

Matter and energy are
OA) similar to work and distance.
OB) interconvertible.
O C) not related to each other.
O D) similar to mass and weight.

Answers

When energy transforms into mass, the amount of energy does not remain the same. When mass transforms into energy, the amount of energy also does not remain the same. However, the amount of matter and energy remains the same. ... You would weigh much less on the Moon because it is only about one-sixth the mass of Earth. So the answer is D

Which would be an example of a homogeneous mixture?

Question 10 options:

Sprite


marinara sauce


air


ranch dressing

Answers

Answer:

Air

Explanation:

Air is an homogeneous mixture because it contain gaseous samples that have the same proportion throughout it's given sample. Air is a mixture of gaseous substances of 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.04% carbon dioxide, 1% of water vapor and small amounts of other gases in same proportion.

how do I explain chromotography without memorizing ​

Answers

this is what i usually do -

watch videos based on the topic and take notesread articles based on the topic watch documentaries based on the topic

this is what works best for me it may work different for you but using these methods i'm able to do well on tests without really memorizing much

hope that helps :)

Answer:

its good

Explanation:

it's great vsvhebejehsdhdbehhebehdbeh

Boron (B) has two Isotopes, boron-10 and boron-11. The atomic weight of boron is the

A. combined masses of boron-10 and boron-11

B. average number of neutrons in boron-10 and boron-11

C. weighted average of the masses of boron-10 and boron-11

D. mass of boron-10 minus the mass of boron-11​

Answers

Answer:

C. is the correct answer

Explanation:

I just completed this question and got it correct.

Isotopes of an element have 2 things that change. What are they?

Answers

Answer:

.

Explanation:

Isotopes are different in neutrons and mass number.

Testing a hypothesis is

Answers

Answer:

State the hypotheses. Every hypothesis test requires the analyst to state a null hypothesis and an alternative hypothesis. Formulate an analysis plan. The analysis plan describes how to use sample data to accept or reject the null hypothesis. Analyze sample data. Interpret the results.

Explanation:

Answer:

Your hypothesis is what your guess is for an answer and testing would be to test your hypothesis to see if its right

Explanation:

Tertiary or top consumers are animals at the top of the food web. They may feed off either primary or secondary consumers. What animals would fit into this classification?

Answers

Answer:

Coyotes, Bald Eagles, & Gray wolf.

The sum of two integers is -4. Can the two integers both be positive?

Answers

Answer: No.

Explanation: A negative integer can only be made with 2 negative integers or 1 positive and 1 negative integer.

Are all physical reactions reversible?

Answers

no not all. for example cutting down a tree is a physical reaction/change but it is not something you can redo.

How do you convert 8.5600x[tex]10^{2}[/tex] from scientific notation to standard notation?

Answers

Answer:

856.00

Explanation:

just move the decimal two places to the right :)

If you had zinc and copper and melted it down into uranium what would happen? I will mark brainliest

Answers

Answer: Major radioactive elements (such as uranium) break down and create lead as one of ... Exposure to even small amounts of lead can be harmful since lead has no use in the body. ... of all industrial metals in the world because lead is easily re-melted and refined. ... Other metals that are found with zinc are silver and copper.

Explanation:

Vgufbnydvcggubvb.
Njfstubs yo f try if yo nfkkkg in dtncfuvduj

kate and williams wedding cost about 21,000,000 english pounds how much is this in american dollars if

Answers

Answer:

2$

Explanation:

bru

Greg ran for 25 minutes at a speed of 5 km/m. Find the distance.

Answers

Here it is⬆️ Distance is 125 km

The density of liquid mercury is 13.6 g/mL. What is the mass of a 175 mL sample of mercury?​

Answers

Answer:

The answer is

2380 g

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

mass = Density × volume

From the question

density of mercury = 13.6 g/mL

volume = 175 mL

The mass of the metal is

mass = 13.6 × 175

We have the final answer as

2380 g

Hope this helps you

how many valence electrons are in the element gallium? explain how you determined the number.

Answers

Gallium has three valence electrons.

Elements in the periodic table are classified into groups and periods. Elements in a given group have the same number of valence electrons on their outermost shell while the elements in a period have the same number of shells.

All the elements in group 13 have three electrons in their outermost shell. Gallium is an element of group 13. This means that gallium also has three electrons in its outermost shell(valence electrons).

Learn more: https://brainly.com/question/2673886

Gallium has 3 valence electrons (1 electron in the 4p orbital and 2 electrons in the 4s orbital) because the valence electrons are those located in the outermost energy level of an atom.

Gallium has an atomic number of 31, which means it has 31 electrons in total. The electron configuration of gallium can be represented as [Ar] 3d¹⁰ 4s² 4p¹.

Within the n=4 shell, gallium has electrons in the 4s and 4p orbitals. The 4s orbital can hold a maximum of 2 electrons, while the 4p orbital can hold a maximum of 6 electrons. In the case of gallium, there is 1 electron in the 4p orbital.

To learn more about the valence electrons, follow the link:

https://brainly.com/question/31264554

#SPJ6

Which term describes a mixture that is not uniform throughout?
1. chemically bonded
2. heterogeneous
3. homogeneous
4. solution

Answers

The term that best describes no being uniform throughout is heterogeneous

Which molecule is sometime referred to as “the recipe book for how to make a protein"?

Answers

Answer:

RNA molecules

Explanation:

RNA molecules carry the instructions that are necessary to create proteins

Answer:

RNA molecules

Explanation:

RNA molecules carry the instructions that are necessary to create proteins

There are a equal number of protons and electeons in natural atoms True or false​

Answers

Answer:

false

Explanation:

There are a equal number of protons and electrons in neutral atoms.

Forming a hypothesis is accomplished through___ reasoning

Answers

Scientific would be the word to fill in the blank


8. In
studies, scientists do not interfere with what is going on.

Answers

Answer:

Observational

Explanation:

This is the answer because researchers or scientist observe the effect of a  diagnostic test, treatment or other intervention without trying to change anything.

Mick has a glass of water. Which of the following tools could he use to measure the volume of water he has in the glass? A. a spring scale B. a triple beam balance C. a metric ruler D. a graduated cylinder

Answers

Answer:

D

Explanation:

Study Island

Answer:

D. a graduated cylinder is the correct answer

Explanation:

Approximately how tall is Baker Hill? Don't forget your unit

Answers

Answer:

the elevation is 1,539

Explanation:

1.54x10-1 L / 2.36x 10-45 solve this in scientific notation

Answers

Answer:

Fish is the best time to go

Explanation:

Chicken nuggets and a salad and some onion rings and a new charger

what is the chemical name of C9F7

Answers

Answer:

Chlorogenic acid.

Explanation:

Answer:

chlorofluorocarbons

Explanation:

can someone please help me

Answers

Gold

___________________

Answer:

Gold

Explanation:

A single atom of silver has a total of 47 protons and electrons and 61 neutrons. ... Therefore, gold has a density of 19.32 g/cm3 whereas silver has a density of only 10.49 g/cm3. Thus, a 1 oz bar of gold will be almost half as large as a 1 oz bar of silver

please help me with answering this question :( asap!!

Answers

Answer:

32. CnH2n+2

33. Ester

34. Water and corbondioxide.

35. dibromoethane

What is the name of the ionic compound LigPO,?
lanthanum phosphide
lanthanum phosphide
lithium phosphate
lanthanum phosphate

Answers

lithium phosphate hope this helps

Read the time line. A timeline. The timeline lists the following years: 100 B C E, 1 C E, 100 C E, 200 C E, 300 C E, 400 C E, 500 C E. What time intervals are used on the time line? one year one hundred years five hundred years one thousand years

Answers

100 years

There's 100 years in between each listed year.

Answer:

A 100

Explanation:

Electrons are in regions around the nucleus called energy levels. The first
energy level

Answers

Answer:

can only accommodate 2 electrons

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