What is the initial concentration of a solution if 40.0 mL is diluted to make 720 mL of a 0.45 M solution?

Answers

Answer 1

Answer:

8.1 M

Explanation:

What is the initial concentration of a solution if 40.0 mL is diluted to make 720 mL of a 0.45 M solution?

LET Y = INITIAL CONCENTRATION

SO

Y TIMES 40/720 = 0.45 m

SO

Y= (0.45) X 720/40=

0.45 X 72/4 =

0.45 X 18 =8.1 M

Answer 2

Concentration is related to the mass and volume. 8.1 M  initial concentration of a solution is required if 40 ml is diluted to make 720 ml of a 0.45 M solution.  

What is initial concentration ?

The first measured concentration of a compound in a substance is called as initial concentration. Initial concentration also measure with the help of molarity.

Write out the equation C = m ÷ V, where m is the mass of the solute and V is the total volume of the solution. Substitute  the values you found for the mass and volume, and divide them to find the concentration of your solution.  

Let X is the initial concentration,

so, X times 40 ÷ 720 = 0.45

X = ( 0.45 ) × ( 720÷40)

= 0.45 × 18

= 8.1 M

Hence, 8.1 M  initial concentration of a solution is required .

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Related Questions


Can you force the atoms into new configurations by pushing atoms around? What does this suggest
about the configuration of atoms in real molecules?
What is the difference between Electron Geometry and Molecule Geometry?
In one or two grammatically correct sentences, write a definition for the term Molecule Geometry.

Answers

Answer:

Yes

Explanation:

By forcing the atoms into a new configuration is possible.

The addition of new atoms around the atom will change the electronic geometry of the atoms. The addition of electron-accepting or donating atoms will result in a change in configuration. The configuration change will result in the change in the hybridization of the atom, and it will acquire a new shape. The geometry of the molecule changes and it will acquire the lowest energy state.

This suggests that atoms in real molecules are present in the flexible state of configuration, and are at least energy, The change in the surrounding changes the configuration of the atoms, and are easily configured.

An exothermic reaction releases 86.5 kJ. How many kilocalories of
energy are released?

Answers

Since 1 calories is 4.1858 Joules, 86.5kJ is 86.5 x (1/4.1858) = 20.66510583 kCal = 20.7 kCal (3 s.f)

A unit for measuring work is called the _____.

horsepower
effort
time
foot-pound

Answers

Answer:

A unit for measuring work is called the foot-pound

What type of energy is best described as the energy required to break the bonds present in the reactants?
A
activation energy
B
potential energy
С
kinetic energy
D
thermal energy
hay

Answers

Answer:

b

Explanation:

Haty

The energy required to break the bond in the reactants is activation energy .

Hence, option (A) is correct answer.

What is Exothermic Reaction ?

The chemical reaction which releases energy are known as exothermic reaction. Bond forming is exothermic process. Activation energy is needed to initiate the reaction. In exothermic reaction potential energy converted into kinetic energy.

What is Endothermic Reaction ?

The chemical reaction which absorbs heat from the surrounding is known as endothermic reaction. Bond breaking is endothermic reaction.  Activation energy is needed to initiate the reaction. In endothermic reaction kinetic energy converted into potential energy.

Thus, from the above conclusion we can say that The energy required to break the bond in the reactants is activation energy .

Hence, option (A) is correct answer.

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Which object represents a heterogeneous
mixture

Answers

Answer:

oil and water

Explanation:

oil and water - When you put oil and water together they do not mix. Therefore, these are a heterogeneous mixture since they are two separate parts.

U ever get an answer

Answers

yesn’t. they are either wrong or links

pls help i am in 8th grade k12

Answers

Answer:

zzxdczxc V

Explanation:

what are the products of the reaction: Be(s)+ Cl2(g)⟶

Answers

Answer:

BeCl2

Explanation:

Be+Cl2=BeCl2

The small flag indicating wind direction on a station weather plot points in the direction that the wind is going.

True or False

Answers

Answer:

False

Explanation: The wind's direction is shown by a long shaft. it will point to the direction from which direction the wind is blowing.

False is the true answer

element Q,X, and Z are in the same group on the periodic table and are listed in order of increasing atomic number.The melting point of element Q is -219 Celsius and the melting point of element Z is -7 celsius. Which temperature is closest to the melting point of element X

Answers

Answer:

Very low ionization energy: metal bonds easily: group 1, or maybe 2 low melting.

Explanation:

A balloon contains 0.76 mol O2, 0.18 mol Ne, 0.031 mol Xe and 0.026 mol CO2 at 749 mm Hg. What is the partial pressure of Ne

Answers

Answer:

ans given below

Explanation:

To keep simplicity, let's assume these gases behave ideally so we can use the equations for ideal gas. One of these equation is the Raoult's Law written below.

P* = xP

This is another form of the Raoult's Law where x is the mole fraction. Let's find x for O2.

x = 0.18/(0.76+0.18+0.031+0.026) = 0.1805

Partial Pressure = (0.1805)(749 mmHg) = 135.23 mmHg

Read the etymology entry.
antagonize
antagonize (v.) 1630s, "to compete with" (obsolete); 1742, "act in opposition to, struggle against continuously,"
from Greek antagonizesthai "to struggle against, oppose, be a rival," from anti "against" (see anti-) + agonizesthai
"to contend for a prize," from agon "a struggle, a contest" (see agony). Meaning "make antagonistic" is by 1882.
What original language did the word antagonize come from?
O Greek
O Latin
O Middle French
O Middle English

Answers

Answer:

latin

Explanation:

im not sure sorry if wrong

Answer:

Greek

Explanation:

Mid 17th century (in the sense 'compete with'): from Greek antagōnizesthai, from ant- 'against' + agōnizesthai 'struggle' (see agonize).

The student burns 10 g of magnesium in air to produce magnesium oxide (MgO).
2Mg + 0 + 2MgO
Calculate the maximum mass of magnesium oxide that could be produced in the reaction.

Answers

Answer:

x=403/24,3 = 16.58 gm MgO

EXPLANATION

The student burns 10 g of magnesium in air to produce magnesium oxide (MgO)

2Mg + 0 + 2MgO

Calculate the maximum mass of magnesium oxide that could be produced in the reaction.

Oxygen exist in nature as O2, diatomic.

so

The student burns 10 g of magnesium in air to produce magnesium oxide (MgO).

2Mg + 02 + 2MgO

Calculate the maximum mass of magnesium oxide that could be produced in the reaction.

2 moles of Mg produce 2 moles of MgO

1 mole of Mg weighs 24.3 and produces 1 mole of MgO

Mg HAS AN ATOMIC MASS OF 24.3

Mg HAS A MOLAR MASS OF 24.3 +16 = 40.3gm/mole

so 24.3 gm of Mg produce 40.3 gm MgO

set up the ratio

10 gm Mg/x of MgO  = 24.3/40.3

or

10/x = 24.3/40.3

cross multiply and isolate x (use Algebra I)

24.3x =403

x=403/24,3 = 16.58 gm MgO


Why are coal, oil and natural gas called fossil fuels

Answers

From heat and pressure from the earth

A \pu{1.60 g}1.60 g1, point, 60, space, g calcium supplement contains 37.8\%37.8%37, point, 8, percent \ce{Ca}CaC, a by mass. The calcium is present in the supplement as \ce{CaCO3}(s)CaCOX 3 ​ (s) (molar mass \pu{100.09 g/mol}100.09 g/mol100, point, 09, space, g, slash, m, o, l). How many grams of \ce{CaCO3}(s)CaCOX 3 ​ (s) are in the calcium supplement?

Answers

A 1.60 g calcium supplement that contains 37.8% Ca by mass, contains 1.51 g of CaCO₃.

We want to calculate the mass of CaCO₃ in a 1.60 g supplement. We need to consider the following relationships.

The mass percent of Ca is 37.8%, that is, there are 37.8 g of Ca every 100 g of supplement.The molar mass of Ca is 40.08 g/mol.The molar ratio of Ca to CaCO₃ is 1:1.The molar mass of CaCO₃ is 100.09 g/mol.

[tex]1.60gSup \times \frac{37.8gCa}{100gSup} \times \frac{1molCa}{40.08gCa} \times \frac{1molCaCO_3}{1molCa} \times \frac{100.09gCaCO_3}{1molCaCO_3} = 1.51gCaCO_3[/tex]

A 1.60 g calcium supplement that contains 37.8% Ca by mass, contains 1.51 g of CaCO₃.

Learn more: https://brainly.com/question/14990953

A 1.60 g calcium supplement contains 37.8% Ca by mass. The calcium is present in the supplement as CaCO₃(s) (molar mass 100.09 g/mol). How many grams of CaCO₃(s) are in the calcium supplement?

What happens to the pH of a solution is the concentration of hydronium ions decrease

Answers

If the hydronium concentration decreases, the pH increases, resulting in a solution that is less acidic and more basic

Someone please help? I've had a go at this myself (see picture of working attached) but not sure where to go from there?

75ml of a solutipn of 0.1mol l-1 NaOH neutralises 25ml of a solution of an acid. The formula of the acid is HxA and the concentration of the acid is 0.1mol l-1. What is the value of x?​

Answers

Answer:

75 ml of 0.1M  base neutralizes 25 ml of 0.1M acid, which means the acid has 0.3 moles/L of H ion

but that means each molecule of the acid has 3 times as many H ions aH ions in a molecule of NaOH

which means the formula for the acid must be H3A and

the value of x in

HxA is 3

Explanation:

75ml of a solutipn of 0.1moL  l-1 NaOH neutralises 25ml of a solution of an acid. The formula of the acid is HxA and the concentration of the acid is 0.1mol l-1. What is the value of x?​

the concentration of both the and the base are the same at 0.1M

the base...NaOH has 0.1 moles/L of OH ion

75 ml of 0.1M  base neutralizes 25 ml of 0.1M acid, which means the acid has 0.3 moles/L of H ion

but that means each molecule of the acid has 3 times as many H ions aH ions in a molecule of NaOH

which means the formula for the acid must be H3A and the value of x in

HxA is 3

The molarity of an aqueous solution of CaCl is defined as the

Answers

Answer:

Molarity of aqueous solution of CaCl2 can be defined as moles of CaCl2 per litre of solution

Mixture of a 25.00 mL aliquot of the sample solution with 5.00 mL of a 0.250 ppm warfarin standard yielded a solution with an intensity of 670. Calculate the percentage of warfarin in the sample.

Answers

Answer:

750

Explanation:

An element with 3 valence electrons would be a
0-3 anion
0 + 3 anion
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0 - 3 cation

Answers

Answer:

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Explanation:

Photosynthesis is a process used by plants and other organisms to convert light energy into chemical energy that, through cellular respiration, can later be released to fuel the organism's activities.

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1 1 - incorrect
3
6

Answers

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Explanation:

You can do this perfectly well without referring to chemical shift tables at all. In the spectrum there are a total of three peaks - that means that there are only three different environments for the carbons, despite there being four carbon atoms.

what is a nucleus and what are the functions?

Answers

nucleus, in biology, a specialized structure occurring in most cells (except bacteria and blue-green algae) and separated from the rest of the cell by a double layer, the nuclear membrane. This membrane seems to be continuous with the endoplasmic reticulum (a membranous network) of the cell and has pores, which probably permit the entrance of large molecules. The nucleus controls and regulates the activities of the cell (e.g., growth and metabolism) and carries the genes, structures that contain the hereditary information

b) If 0.564 mol of S and 1.35 mol of Cl2 are reacted, which substance is the limiting reactant?

Answers

Answer:

what is the question

Explanation:

Ba(ClO 4 ) 2 (aq)+K 2 SO 4 (aq) -> BaSO 4 (s)+2 KClO 4 (aq)

Write the complete ionic equation

Answers

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Explanation:

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Answers

Answer:

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Explanation:

because salt dissolves in water but sand doesn't

Explanation:

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What happens to light when it travels through a medium?
O it speeds up
O it slows down
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Answers

Answer:

The speed of light is constant and absolute and referenced to a vacuum.  The speed at which light itself travels through different mediums changes.

Light travels slower through denser mediums. It travels slower through the air than it does in a vacuum. Slower again through glass than air, or water than air or glass.

What is the mole ratio between FeCl3 and Fe(C5H7O3)3 ?

Answers

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Explanation:

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Answer:

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Does your teacher know your cheating
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Which of the following corresponds to an alpha particle?
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B. 3/2He
C. 2/2H
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Answers

Answer:

D. 4/2 He corresponds to an alpha particle.

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