All categories

3 years ago

What is the final concentration if 75.0 ml of a 3.50 m glucose solution is diluted to a volume of 400.0 ml?

Chemistry

1 answer:

Eduardwww [97]3 years ago

8 0

Answer: the final concentration is 0.656M

Explanation:

The concentration may be expressed in several ways. In this case, since the data talks about volume of the solution, the correct unit of the value 3.50 is M (capital M, and not m), so it is 3.50 M, which means 3.50 Molar

Hence, we are dealing with molarity.

The equation for molarity, M, is:

M = number of moles of solute / volume of solution in liters

Wnen you solve for the number of moles of solute, you get:

number of moles of solute = M × volume in liters of the solution

When it is said that the glucose solution is diluted to a volume of 400.0 ml, means than only solvent was added. That implies, that the number of moles of solute of the final (diluted) solution is the same number of moles of the 3.50 M glucose solution.

That permits you to wite theses equations:

# moles of glucose in 3.50 M solution, n₁

n₁ = 3.50 M × 75.0 ml × 1 liter/1000 ml

# moles of glucose in the diluted solution, n₂

n₂ = C × 400.0ml × 1 liter / 1000 ml

n₁ = n₂

⇒ 3.50 M × 75.0 ml × 1 liter/1000 ml = C × 400.0ml × 1 liter / 1000 ml

Solve for the unknown concentration, C:

C = 3.50 M × 75.0 / 400.0 = 0.656M

The answer is expressed with three significant digits, because 75.0 ml and 3.50 M are expressed with three significant digits.

You might be interested in

A gas of 19 mL at a pressure of 740 mmHg can be expected to change its pressure when its volume changes to 30. mL. Express its n

Soloha48 [4]

To solve this we assume that the gas is an ideal gas. Then, we can use the ideal gas equation which is expressed as PV = nRT. At a constant temperature and number of moles of the gas the product of PV is equal to some constant. At another set of condition of temperature, the constant is still the same. Calculations are as follows:

P1V1 =P2V2

P2 = P1V1/V2

P2 = 740mmhg x 19 mL / 30 mL

P2 = 468.67 mmHg = 0.62 atm

6 0

3 years ago

Read 2 more answers

In 1986 an electrical power plant in taylorsville, georgia, burned 8,376,726 tons of coal, a national record at that time. assum

RideAnS [48]

C + O2 â†’ CO2 (8,376,726 tons) x (0.80) / (12.01078 g C/mol) x (1 mol CO2/ 1 mol C) x (44.00964 g CO2/mol) = 24,555,054 tons CO2

6 0

3 years ago

Read 2 more answers

Which statements describing chemical and nuclear reactions are true?

Arte-miy333 [17]

Answer:

What statements?

Explanation:

they both release harmful chemicals and can pollute the earth and destroy our ecosystems.

8 0

2 years ago

What kind of electrical charges do protons,electrons, and neutrons have?

Vinil7 [7]

Protons = Positive Charge

Neutrons = Neutral Charge/No Charge

Electrons = Negative Charge

This one's simple: electrons have a negative charge, protons have a positive charge and neutrons — as the name implies — are neutral.

Protons

Elements are differentiated from each other by the number of protons within their nucleus. For example, carbon atoms have six protons in their nucleus. Atoms with seven protons are nitrogen atoms. The number of protons for each element is known as the atomic number and does not change in chemical reactions. In other words, the elements at the beginning of a reaction -- known as the reactants -- are the same elements at the end of a reaction -- known as the products.

Neutrons

Although elements have a specific number of protons, atoms of the same element may have different numbers of neutrons and are termed isotopes. For example, hydrogen has three isotopes, each with a single proton. Protium is an isotope of hydrogen with zero neutrons, deuterium has one neutron, and tritium has two neutrons. Although the number of neutrons may differ between isotopes, the isotopes all behave in a chemically similar manner.

Electrons

Electrons are not bound as tightly to the atom as protons and neutrons. This allows electrons to be lost, gained or even shared between atoms. Atoms that lose an electron become ions with a +1 charge, since there is now one more proton than electrons. Atoms that gain an electron have one more electron than protons and become a -1 ion. Chemical bonds that hold atoms together to form compounds result from these changes in the number and arrangement of electrons.

4 0

3 years ago

Which describes a substance with a high index of refraction?

Mazyrski [523]

Answer:

It causes light to slow down significantly

Explanation:

The index of refraction of a substance describes the speed of light in that substance, as a ratio of the speed of light in vacuum to its speed in that substance.

just search it up and there is your answer

5 0

3 years ago

Read 2 more answers