a chemist wants to mix a 70% saline solution with a 8 liters of a 25% saline solution to create a solution with 40% salt. how many liters of the 70% solution does she need? (saline is a mixture of salt and water)

Answers

Answer 1

4 liters of the 70% solution are required by the chemist.

briefly:-

8 liters of saline solution divided by 25%

Saline solution at 25% = 0.25 x 8 = 2 liters

Let there be x liters of saline solution at 70%.

Salt = 8 plus x

40% of salt is equal to 25% of saline solution plus 70% of saline solution.

2 + (70/100)x = (40/100)(8 + x)

2 + 0.7x = 0.4(8 + x)

2 + 0.7x = 3.2 + 0.4x

assemble similar terms

0.7x - 0.4x = 3.2 - 20.3

x = 1.2

x = 1.2 / 0.3

x = 4

4 liters of the 70% solution are required by the chemist.

How can the volume of a dilution be determined?

The following equation can be used to determine the volume or concentration of a concentrated or diluted solution: M1V1 = M2V2.

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Related Questions

PLEASE ANSWER THIS ASAP I WILL MARK YOU THE BRAINLIEST
The actual subject is Science but they dont have that as a option in pick a subject

Answers

Answer:

up to down(1 to 6)

Explanation:

speed:

1,3,4

Velocity:

everything except 1,3,4

1 to 4) it’s weird yeah doesn’t like you choose your subject

Microorganisms have a major role in maintaining soil biodiversity. They recycle nutrients in ecosystems and decompose organic matter in soil. Organic matter contains dead and living plant and animal materials. Microorganisms convert these materials into simpler compounds that maintain soil quality and help with plant growth.

Which solution could best help to restore or increase microorganisms and soil biodiversity?
A.
adding manure or compost to the soil
B.
spraying chemical weed-killers and fertilizers on the soil
C.
removing all ground-covering plants from the soil
D.
adding sewage containing synthetic materials to the soil

Answers

Answer:

A i think

Explanation:

The solution that could best help to restore or increase microorganisms and soil biodiversity is adding manure or compost to the soil.

What are microorganisms?

A microorganism, or microbe, is an organism of microscopic size, which may exist in its single-celled form or as a colony of cells. The possible existence of unseen microbial life was suspected from ancient times, such as in Jain scriptures from sixth century BC India.

Microorganisms are minute organisms that are invisible to the normal eye.” Microorganisms are so small that they can only be seen under a microscope. These include a huge range of organisms such as bacteria, viruses, fungi, algae, protozoa, etc.

Given options are-

A. adding manure or compost to the soil

B. spraying chemical weed-killers and fertilizers on the soil

C. removing all ground-covering plants from the soil

D. adding sewage containing synthetic materials to the soil

Therefore, The solution that could best help to restore or increase microorganisms and soil biodiversity is adding manure or compost to the soil.

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Is heat a from of kinetic or potential energy?

Answers

Answer:

its made up of both but I would probably say kinetic

Explanation:

Yes because thermal energy comes from a substance whose molecules and atoms are vibrating faster due to a rise in temperature

(No scammers) can someone help me pls

Answers

Answers is - 198 kilo joules

What does the mole ratio represent

Answers

Answer:

A mole ratio is a conversion factor that relates the amounts in moles of any two substances in a chemical reaction

Explanation:

Help!!!!

I can’t understand this question

Answers

Answer:

free points!!!!!!!!!!!!!!

Viruses are not considered organisms, because they lack many of the characteristics of living things. A virus is essentially a string of genetic material in
a protein coat. Some viruses contain DNA, while others, called retroviruses, contain RNA. One example of a retrovirus is HIV, which causes AIDS
How is RNA different from DNA? Choose the 2 statements that apply
A. DNA and RNA use different sets of nitrogen bases.
B
DNA has 1 strand of genetic material while RNA has 2 strands
C. DNA contains deoxyribose sugar and RNA contains ribose sugar,
D. DNA and RNA are proteins

Answers

Answer:

well, I think the answer is C

The difference between RNA and DNA are:

A. DNA and RNA use different sets of nitrogen bases.

C. DNA contains deoxyribose sugar and RNA contains ribose sugar.

What are RNA and DNA?

DNA and RNA, both are genetic materials, but DNA is double-stranded and RNA is single-stranded.

DNA is present in all animals and plants, and RNA is present in viruses and bacteria.

Both are made up of nitrogenous bases and sugar.

Thus, the correct options are A and C.

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what happens to the rate of a reaction as the reaction progresses

Answers

The rate of a reaction decreases as the reaction progresses.

Copper(Ii) Iodate + Potassium Carbonate = Potassium Iodate + copper(I)carbonate into a formula equation ?

Answers

Answer:

Cu(IO3)2 + K2CO3 → 2KIO3 + CuCO3

A 10.150g sample of a compound known to contain phosphorus and oxygen yields 5.717 g of oxygen. Find the empirical formula of the compound

Answers

Answer: The empirical formula is [tex]P_2O_5[/tex]

Explanation:

Mass of O = 5.717 g

Mass of P= (10.150-5.717) g = 4.433 g  

Step 1 : convert given masses into moles.

Moles of O =[tex]\frac{\text{ given mass of O}}{\text{ molar mass of O}}= \frac{5.717g}{16g/mole}=0.357moles[/tex]

Moles of P=[tex]\frac{\text{ given mass of P}}{\text{ molar mass of P}}= \frac{4.433g}{31g/mole}=0.143moles[/tex]  

Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.

For O = [tex]\frac{0.357}{0.143}=2.5[/tex]  

For P =[tex]\frac{0.143}{0.143}=1[/tex]

The ratio is to be converted to whole number

Thus whole number ratio of O : P = [tex]2.5\times 2:1\times 2=5: 2[/tex]

Hence the empirical formula is [tex]P_2O_5[/tex]

The Moon only emits light at night.
True
False - does not emit light at all

Answers

Answer:

It's trueeeeeee:))))))

Answer:

TRUE

Explanation:

Jose was driving to New York City. He traveled 100 miles in the first hour of the trip and 20 miles in the last hour of his trip. Which can we
say about Jose's drive? (speed = distance = time)
A. Jose drove less than 120 miles.
B. Jose drove faster the first hour of his drive.
C. Jose drove slower the first hour of his drive.
D. Jose drove the same speed for the entire drive.

Answers

Answer:

b

Explanation:

he drove 5x faster than the time was when he was on the last hour (maybe caught in traffic or wasn't in a rush)

1. An unknown compound was found to have a percent composition of: 47.0%
potassium, 14.5% carbon, and 38.5 % oxygen. What is its empirical formula? If
the true molar mass of the compound is 166.22 g/mol, what is its molecular
formula?

Answers

Answer:The empirical formula is KCO2

Explanation:

2. What percentage of the offspring
will have the red flowers?

Answers

Answer:

1/4 of the offspeing will have the red flowers

A. How do the following factors affect the spontaneity of a reaction?
i. Enthalpy
ii. Entropy ​

Answers

The more negative the enthalpy is, the more spontaneous the reaction will be, because a negative enthalpy releases heat. The more positive the entropy is, the more spontaneous the reaction will be, because a positive entropy increases disorder.

How would I make a biodegradable mask

Answers

Answer:

Explanation:

Go to a craft store and buy so me material that are biodegradable

PLEASE HELP I LITERALLY CAN'T
What volume does 1 mol of Ar(g) occupy at 25 C and 100 kPa?
a) 24.8 L
b) 1.0 L
c) 22.4 L
d) 40.0 L

What volume is occupied by 1 mol of Cl2(g) at SATP?
a) 12.4 L
b) 11.2 L
c) 22.4 L
d) 24.8 L

Answers

I think the answer is B for 1. And D for 2.

The amount of volume will be (1) 23.10 L and ( 2) 22.4 L by using gas law.

What is gas law?

Gas law gave the relation between pressure, volume and temperature.

It can be expressed as:

PV = nRT.

where, P is pressure, R is gas constant and T is temperature.

Calculation of volume by using gas law.

1) Given data:

n = 1 mol

T = 25 degree C = 25 + 273 =

P = 100 kpa

Volume can be determined by the gas law.

PV = nRT

V = nRT/P

V = 1 × 8.31 × 278 / 100

V = 23.10 L

2) It is known that at STP 1 mol of any gas volume will be 22.4 L.

Therefore, the correct answer will be option (c).

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A gas has an initial volume of 15 L. If the temperature increases from 330 K to 450 K, what is the new volume.

Answers

Answer:

20.(45)L or about 20.4545L

Explanation:

PV = nRT

Where:

P - pressure

V - volume

n - number of particle moles

R - a constant

T - temperature in K

We can assume the P and n (and definitely R) stay the same, so we infer that

[tex]V_1 = \frac{nRT_1}{P} = 15L\\V_2 = \frac{nRT_2}{P}\\V_1 / V_2 = \frac{nRT_1}{P} / \frac{nRT_2}{P} = \frac{T_1}{T_2}\\\\15L / V_2 = \frac{330K}{450K} = \frac{11}{15}\\\\V_2 = 15L \cdot \frac{15}{11} = 20.(45)L[/tex]

How do I perform a titration on coca-cola or Pepsi, when I cannot see the color change because the color is too dark. The indicator is phenolphthalein.

Answers

Answer: maybe you need to do very dilute solution?

Explanation: you should have an pH meter instead of indicator.

Phosphoric acid H3PO4 have three ekvivalent points.

Another way could be using a conductivity meter.

For dark reactants, use a pH meter.
For colorless WEAK reactants(acids/bases), use phenolpthalein..
For colorless STRONG reactants, use methyl orange.

1. What is a common example of a converging mirror?
2. Where must you (the object) stand in front of a converging mirror if you want to see an upright,
virtual image of yourself? What is the size of the image compared to the object?
3. A converging mirror produces no image when the object is at
4. If the centre of curvature in a converging mirror is at 10cm, the focal point will be at
om

Answers

1)Concave mirrors are called converging mirrors because as light falls on the mirror, it collects the light and refocuses the parallel incoming rays.

2)The image produced by a convex mirror is always virtual, and located behind the mirror. When the object is far away from the mirror the image is upright and located at the focal point.

3)When the object is located at the focal point, no image is formed. As discussed earlier in Lesson 3, light rays from the same point on the object will reflect off the mirror and neither converge nor diverge.

sorry I don't know 4one

i HOPE IT'S HELP

Y’all Someone plz help me with these problems.

Girl I will report if u troll or link

Answers

Answer:

A. 650 moles of sulphur.

B. 30 g of FeS₂

Explanation:

The balanced equation for the reaction is given below:

Fe + 2S —> FeS₂

From the balanced equation above,

1 mole of Fe reacted with 2 moles of S to produce 1 mole of FeS₂.

A. Determination of the mole of sulphur needed for the reaction.

From the balanced equation above,

2 moles of S reacted to produce 1 mole of FeS₂.

Therefore, Xmol of S will react to produce 325 moles of FeS₂ i.e

Xmol of S = 2 × 325

Xmol of S = 650 moles

Thus, 650 moles of sulphur are needed for the reaction.

B. Determination of the mass of FeS₂ produced by the reaction of 0.5 mole of sulphur.

From the balanced equation above,

2 moles of S reacted to produce 1 mole of FeS₂.

Therefore, 0.5 mole of S will react to produce = (0.5 × 1)/2 = 0.25 mole of FeS₂.

Finally, we shall determine the mass of 0.25 mole of FeS₂. This can be obtained as follow:

Mole of FeS₂ = 0.25 mole

Molar mass of FeS₂ = 56 + (32×2)

= 56 + 64

= 120 g/mol

Mass of FeS₂ =?

Mass = mole × molar mass

Mass of FeS₂ = 0.25 × 120

Mass of FeS₂ = 30 g

Thus, 30 g of FeS₂ were obtained from the reaction.

10 If Steve was making a solution of ammonium

chloride, how many grams would he have left

undissolved (if any) if he initially placed 140 g of

the chemical into 200 grams of water at 80 °C.

Answers

Answer:

8.8g of ammonium chloride would be undissolved.

Explanation:

The solubility of ammonium chloride at 80°C is: 65.6g / 100mL

As the solubility is 65.6g / 100mL, in 200g = 200mL the solubility will be:

65.6g * 2 =

131.2g / 200g

That means the water at this temperature will dissolve 131.2g of ammonium chloride. As were placed 140g, the mass that will be undissolved is:

140g - 131.2g =

8.8g of ammonium chloride would be undissolved

What is the mass of 4.57 x 1021 molecules of ammonia (NH3)?

Answers

Answer:

4665.97

Explanation:

how does dipping an iron bucket in Molten zinc protect it?​

Answers

Answer:

It forms a barrier that prevents corrosive substances from reaching the underlying steel or iron. The zinc serves as a sacrificial anode so that even if the coating is scratched, the exposed steel will still be protected by the remaining zinc. The zinc protects its base metal by corroding before iron.

Explanation:

Answer:

It protects it from corrosion.

Explanation:

Zinc protects iron and steel from the relentless forces of corrosion. Galvanizing iron and steel by dipping them in molten zinc creates an alloy that can, in the right environmental conditions, protect the iron or steel beneath it for 100 years or more.

Which best describes the products of a
chemical equation?
A. Chemicals before the reaction starts
B. Chemicals after the reaction ends
C. Chemicals on the left of the arrow
D. Chemicals on the right of the arrow

Answers

Answer:

b?

Explanation:

Chemicals after the reaction ends during chemical equation. Therefore, the correct option is option B among all the given options.

What is chemical equation?

In chemistry, you will frequently come across a chemical equation. It is a textual depiction of the procedure that takes place throughout a chemical reaction using numbers and symbols.

The reactants are placed on the left side of such an arrow in a chemical equation, while the reaction's products are placed on the right. Though certain equations may imply equilibrium with the reaction occurring in both directions simultaneously, the tip of the arrow normally heads toward the right or product side of the equation. Chemicals after the reaction ends during chemical equation.

Therefore, the correct option is option B.

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Which is a property of a covalent compound?

A.being shaped easily

B.good electrical conductivity

C.low melting point

Answers

Answer:

c: low melting point

Explanation:

melting point is dependent on intermolecular forces. in covalent compounds, electrons are shared more equally. this means there is less separation of positive and negative charges within the molecules.

Bloc ate 1 craft craft had 3 crafts. How much crafts are there?

Answers

If he had 3 and then ate 1 them that would mean that he has 2 crafts left

If a sound wave refracts, what happens to it? Select all that apply.
It changes its speed and wavelength when it bounces off of a solid surface.
B
It changes direction when it passes through an opening
С
It changes its speed and wavelength when it passes through an opening
D
It changes direction when it passes from one medium to another
E
It changes its speed and wavelength from one medium to another.
F
It changes direction when it bounces off of a solid surface.

Answers

The answer is a and c and d

If a sound wave refracts,It changes its speed and wavelength when it bounces off of a solid surface,It changes its speed and wavelength when it passes through an opening, and It changes direction when it passes from one medium to another. Therefore, option A, C and D are correct.

What is refraction of sound wave ?

An important case in which sound waves change form or spread out is called refraction. This phenomenon affects the bending of a sound wave owing to changes in the wave's speed.

Refraction is the reason ocean waves near a shore parallel to the beach and why glass lenses can be used to focus light waves.

If the air above the earth is warmed than that at the surface, sound will be change shape back downward toward the surface by refraction. Sound propagates in all directions from a point source.

Thus, option A, C and D are correct.

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What is the mass of 1.50 mole of (NH4)2CO3?

Answers

Answer:

144.12873

Explanation:

Hope this helps you

-----------------------------------------------------------------------------------------------------------------

回答:

144.12873

説明:

これがお役に立てば幸いです

Answer:

96gm/mole

Explanation:

(NH 4)2CO 3 =2×18+12+3×16=96gm/mole

Which of these cannot be
a source of centripetal force?
A. mass
B. friction
C. electric force
D. gravity

Answers

Answer:

D. Gravity

Explanation:

Gravity cannot be a source of centripetal force. Gravity is the force of attraction from between all masses in the universe; especially the attraction of the earth’s mass for bodies near its surface; “gravitation cannot be held responsible for people falling in love” with Albert Einstein.

It manner that is serious and solemn. A solemn and dignified feeling.

Therefore, the correct answer is d. gravity.

A. mass

Mass never provides any force. It is what forces act on. Friction acts as a centripetal force on roads when you’re turning in a circle. Gravity acts as a centripetal force for things like satellites and rockets that orbit Earth and other planets. I’m less familiar with electric force, but I’m sure it can work as centripetal force too. Mass is the only option here that isn’t even a force.
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