Calculate the % by mass concentration for each of the following solutions. Match the answers.
1.25g NaCl in 100.0g of solution = [a]%
ce
2.50g K2Cr2O7 in 96.0g of solution = [b]%
nts
10.0g CaCl2 in 250.0g of solution = [c]%
ns
20.0g Kl in 100.Ogof solution = [d]%


Answers

Answer 1

The percentage by mass of each of the compounds would be 40%, 2.6%, 4%, and 20% respectively

Percentage by mass

The percentage by mass of a substance is given by:

Percent by mass = mass of substance/mass of solution x 100%.

For NaCl: Percent by mass = 25/100 = 40%For K2Cr2O7: Percent by mass = 2.50/96 = 2.6%For CaCl2: Percentage by mass = 10/250 = 4%For KI: Percent by mass = 20/100 = 20%

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Related Questions

Calculate the number of moles in 625mL of a 3.0 M NaOH solution

Answers

mol = M(molar concentration) times V (volume)

0.625 L times 3 mol/L = 1.875 mol

A compound is 69.9% Fe and 30.1% O. What is the empirical formula?

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Answer:

Fe2O3

Explanation:

get the ratio for both Fe and O using relative atomic mass and the percent as the mass

Which of the following molecules contains a covalent bond?

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Answer:

  m

Explanation:

Answer:

CN is your answer.

Explanation:

Hope this helps!!!

2. A body was discovered in the woods. The man has been missing for two days. The
average temperature the previous 48 hours was 50° fahrenheit. When the body was
discovered, it was at peak rigor.

Answers

The man has been missing for two days. The average temperature the previous 48 hours was 50° fahrenheit. 12-24 hours is the time. body was discovered.

Time is the ongoing progression of existence and things that happen in what seems to be an irrevocable order from the past, present, and forward into the future. It is a quantity that is a part of several measurements that are used to compare the length of events or the gaps between them.

To compare how long they last, to order events, and to measure how quickly things change in the real world or in our conscious experience. Along with the three spatial dimensions, time is frequently referred to as an a fourth dimension. A body was discovered in the woods. The man has been missing for two days. The average temperature the previous 48 hours was 50° fahrenheit. 12-24 hours, body was discovered.

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If 30 grams of KCl is dissolved at 10°C, how many additional grams would be needed to make the solution saturated at 60°C? * Captionless Image 45g 20g 15g 75g

Answers

If 30 grams of KCl is dissolved at 10°C, 14 g of KCl should be added to make a saturated solution at 60 °C.

What is a saturated solution?

A saturated solution is a solution in which there is so much solute that if there was any more, it would not dissolve. Its concentration is the same as the solubility at that temperature.

Step 1. Calculate the mass of water.

At 10 °C, the solubility is 31.2 g KCl/100 g H₂O.

30 g KCl × 100 g H₂O/31.2 g KCl = 96 g H₂O

Step 2. Calculate the mass of KCl required to prepare a saturated solution at 60 °C.

At 60 °C, the solubility is 45.8 g KCl/100 g H₂O.

96 g H₂O × 45.8 g KCl/100 g H₂O = 44 g KCl

Step 3. Calculate the mass of KCl that must be added.

44 g - 30 g = 14 g

If 30 grams of KCl is dissolved at 10°C, 14 g of KCl should be added to make a saturated solution at 60 °C.

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How many moles of sodium hydrogen carbonate are present in 2.61 grams of this compound?

Answers

Molar mass of NaHCO_3

23+1+12+3(16)36+4884g/mol

Now

[tex]\\ \sf\longrightarrow No\:of\:moles=\dfrac{Given\:mass}{Molar\:mass}[/tex]

[tex]\\ \sf\longrightarrow No\:of\; moles=\dfrac{2.61}{84}[/tex]

[tex]\\ \sf\longrightarrow No\:of\:moles=0.0312mol[/tex]

If you start with 10 carbon and 3 Hydrogen, what will you end with?

Answers

Answer:

The simplest Organic compounds are made up of only Carbon and Hydrogen atoms only. Compounds of Carbon and Hydrogen only are called Hydrocarbons.

Explanation:

As soon as the rope breaks in picture 4, the car continues to roll forward on its own. This motion is BEST explained by which of the following laws? A. AN object in constant motion tends to remain in motion unless acted on by and unbalanced force. B. For every action there is an equal and opposite reaction/ C. An unbalanced force acting on an object will cause the object to accelerate. D. The force of gravity will cause an object to accelerate toward the earth at a constant rate.

Answers

Answer:

what is picture 4 you need to show it

I am so confused that i don't even understand how to answer it

Answers

Answer:

What's the question so I can help?

I will just edit my answer when you have asked your question and post it here.

Explanation:

Where are the most greenhouse gases generated during the production of electricity?

Answers

Answer: city w

Explanation:

cities w,y,z all use renewable energy (sun, water, wind) which offput any greenhouse emmissions,

city w uses coal which produces greenhouse gases when used (burnt).

hope this helped! ♡

How is fission different than alpha or beta decay?

Answers

Fission is when the parent atom splits into two daughter products. Whereas atom with a mass number is lower by 4 and an atomic number is lower by 2.

Is nuclear fission alpha or beta?

Fission outcomes emit beta radiation, while actinides mainly emit alpha radiation. Many of each also radiate gamma radiation.

The beta decays form an isobaric, fission-product decay chain for each mass number.

Thus, Fission is when the parent atom splits into two daughter products.

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Help me please, Im giving brainliest answer. ​

Answers

Answer:

Sodium nitride is exothermic reaction and hydrochloric acid is endothermic reaction.

Use the chart below to answer the question.

Answer correctly.

Which species are more closely related?


A) M. furo and F. catus

B) Balenopora and Mustela

C) M. furo and B physalus

D) B. physalus and F. catus

Answers

Answer:

Species M. furo and F. catus

Explanation:

When you look at their family name, both species have -lidae at the end, indicating that they are more closely related.

PLS HELP FAST!! 50 POINTS AND BRAINLEYIST FOR WHOEVER ANSWERS THIS FASTEST.

In one to two sentences, describe the characteristics of a high-pressure system.

In one to two sentences, explain what biome comprises most of Antarctica and why the continent is described as being part of this biome.

ALSO, IF YOU COPY, PLEASE REWORD SENTENCES.

Answers

A high pressure system has higher pressure at its center than the areas around it

Scientists that work in Antarctica mostly refer to the majority of the continent as being a cold desert

Explanation:

Please help me

Phylum ___________ contains organisms that have a cutic|e; a f|exible protective covering.

Answers

Answer:

B Nematoda

Explanation:

SO2 + H2O +_ H2SO3
I need to know how to balance simple direct combination reactions

Answers

Hi so first of all count the number of atoms on both sides.
S = 1
O = 2

H = 2, O = 1

H = 2, S = 1, O = 3

Have a go at multiplying and seeing if you can get each atom to have the same number.

what are the states of matter for the following equation?

6Br⁻ + XeO₃ + 6H⁺ → 3Br₂ + Xe + 3H₂O

Answers

Answer:

Explanation:

On the reactant side, XeO3 is a strong oxidizing agent. It can be a solid or gas. Most likely it is in a solid state.

H+ and Br- combine to form HBr which is a weak acid. So H+ and Br- are in an aqueous state.

On the product side, both Br2 and Xe are not very soluble in water. They will be in gaseous state and H2O is water i.e. liquid state.

• How do the physical and chemical properties of each packaging type help create new and better product?

Answers

Answer:

chemical composition and physical properties of packaging materials determine their ability to fulfill the various functions expected from the package. 

______ contributes to the nitrogen cycle by removing nitrogen from the air and converting it into a form that is usable by plants.

A. earthworms

B. bacteria

C. fungi

D. plants

Answers

Answer:

bacteria

Explanation:

Bacteria removes nitrogen from the air and converts it into a form that is usable by plants.

Answer:

Bacteria

Explanation:

I took the test and got it right

Which of the following is the primary use of land in the United States?

Question 1 options:

Pasture/range


Forest


Cropland


Urban

Answers

Answer:

pasture/range

Explanation:

this is because more than 1/3 of the country's land is being used for this mean alone.

Answer: Forest

Explanation: The largest percentage of land use in the United States is for forests.

Which statement is true of all proteins? (1 point)


They are created by mutations in DNA.


They carry oxygen in human blood.


Their main function is to cause mutations.


Their structure is related to their function.

Answers

Answer:

Their structure is related to their function.

Explanation:

Protein structure is related to their function. Therefore, the correct option is option D among all the given options.

What is protein?

Proteins are huge biomolecular and macromolecular structures made up of one or even more long amino acid residue chains. Proteins serve a wide range of roles inside animals, including catalyzing metabolic events, DNA replication, reacting to stimuli, provides support to organisms and cells including transporting chemicals.

Proteins differ largely in their amino acid sequence, which is determined by the genetic code from their genes and generally culminates with protein folding into such a particular 3D structure that dictates its function. Protein structure is related to their function.

Therefore, the correct option is option D.

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What is the measurement of 2 polar bears

Answers

Answer:

An adult male is between 2.4-3m (8-10 feet) in size and weighs between 350-680kg (775-1500lbs). Females are slightly smaller at around 1.8-2.4m (6-8 feet) and weigh between 150-250kg (330-550lbs).

Balance the following equation. (20 pts)

Answers

Answer:

2Cl (aq) + Pb (aq) -> PbCl² (s)

Explanation:

What is represented in the image?

A: a space-filling model
B: a ball-and-stick model
C: a chemical formula
D: a structural formula

Answers

Answer:

A structural formula is shown, making the answer D.

I need help. Thank you

Answers

Based on the fgiven K_{a} values of the acids, the equilibrim concentrations of[tex]HC_{2}H_{2}O_{2}[/tex] and [tex]NH_{4}^{+}[/tex] is dtermined using ICE tables.

What are acid dissociatio constants [tex]K_{a}[/tex]?

An acid dissociation constant, [tex]K_{a}[/tex] of an acid is a measure of the strength of the acid in solution. The larger the [tex]K_{a}[/tex] value of an acid, the stronger the acid, therefore, acid dissociation constants are usually apply to only weak acids because strong acids have exceedingly large [tex]K_{a}[/tex] values.

It is written as a  qoutient of the equilibrium concentrations of the aqueous species in the acid solution.

[tex]K_{a} = \frac{[H^{+}] [A^-{}]}{HA}[/tex]

For the weak acids such as [tex]HC_{2}H_{2}O_{2}[/tex] and [tex]NH_{4}^{+}[/tex], their equilibrim concentrations are determined using their [tex]K_{a}[/tex] values and an ICE table.

The pH of solutions are estimated using indicators such as methyl orange, methyl red and phenolphthalein. The colors of indicators change according to the pH of the solution

Acidic solutions have pH less than 7 while alkaline solutions have pH greater than 7.

Therefore, acids have low pH and weak acids have low [tex]K_{a}[/tex] values.

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How many grams of hydrogen will be produced from 4.0 moles of Magnesium?

Answers

Answer:

8 grams

Explanation:

trust

What is the correct formula that would
result from the combination of the two
ionic species?
K1+ and Cro 2-

Answers

Answer:

A

Explanation:

Is not my personal answer, but here is what I found.

"This entity has been manually annotated by the ChEBI Team. Potassium chromate is the inorganic compound with the formula (K2CrO4). This yellow solid is the potassium salt of the chromate anion"

Assume you added 40.0 mL of Vitamin C stock solution instead of 25.0 mL when preparing Solution. How would this affect the reaction rate?

Answers

The reaction rate is affected if the vitamin C is added in lower quantity due to lower amount of reactants.

What happen when the vitamin C is added in lower amount?

If you added 40.0 mL of Vitamin C stock solution instead of 25.0 mL when preparing Solution, the reaction rate is affected because of the lower amount of reactant for the chemical reaction. If the reactants are present in larger amount then the products are also produced in large concentration.

So we can conclude that the reaction rate is affected if the vitamin C is added in lower quantity due to lower amount of reactants.

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100 points! Chemistry! Please help if you can with the following two questions

Answers

H_2S+O_2--->SO_2+H_2O

Balance it

2H_2S+3O_2--->2SO_2+2H_2O

So

Molar mass of oxygen=2(16)=32g/mol

Molar mass of SO_2=2(16)+32=32+32=64g/mol

Moles of oxygen:-

Given mass/Molar mass44.7/321.399mol

Here

3 mol of Oxygen produces 2 mol SO_21 mol of oxygen produces 2/3=0.6mol SO_2

Moles of so_2

0.6(1.399)=0.84mol

Mass of water

0.84(64)53.8g

I will give 500 points! What is the composition of Milk?

Answers

Answer:In general, the gross composition of cow's milk in the U.S. is 87.7% water, 4.9% lactose (carbohydrate), 3.4% fat, 3.3% protein, and 0.7% minerals (referred to as ash).

Explanation:

i got it ccorerct

Answer:

The milk of goats and sheep is similar in composition to that of cows.

Milk protein consists mainly of casein, and it exists in several classes: α, β, etc. If milk pH falls below 4.6, the casein precipitates. Although casein represents 80–85% of total milk protein, when precipitation occurs, the liquid portion is referred to as whey.

The remaining proteins are found in whey, and they include serum albumin, immunoglobulins, α-lactalbumin, etc. Milk carbohydrate is lactose, and its content is fairly consistent among breeds of milk cows at around 5.0%.

lactose is the main sugar; smaller quantities of glucose and citric acid exist. The fat content varies between ca. 3.5 and 5.0% depending upon cattle breed.

The ash content of around 0.7% consists of a relatively high level of Ca2+ and a lower level of Fe2+.

The pH of fresh whole milk is around 6.6 but it may reach ca. 6.8 from a cow that has mastitis.

Mastitis is an infection of the udder that is most often caused by Streptococcus agalactiae and S. Uberois but sometimes by Staphylococcus aureus or Streptococcus dysgalactiae.

Fresh milk of mastitis cows mainly has leucocytes (white blood cells) >106/ml as compared to nonmetastatic milk which has 70,000/ml leucocytes.

Milk contains a very adequate supply of B vitamins with pantothenic acid and riboflavin being the two most abundant. Vitamins A and D are added for human consumption, and their presence has no known effect on the activity of microorganisms.

Overall, the chemical composition of whole cow’s milk makes it an ideal growth medium for heterotrophic microorganisms, including the nutritionally fastidious Gram-positive lactic acid bacteria. However, the milk microbiota utilizes these constituents and brings about its spoilage.

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