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3 years ago

What is the molarity of a solution prepared by dissolving 2.5 grams of LiNO3 in sufficient water to make 60.0 mL of solution?

Chemistry

2 answers:

Dafna1 [17]3 years ago

7 0

Answer:

The molarity of the solution is 0.6 $\frac{moles}{L}$

Explanation:

Molarity (M) is the number of moles of solute that are dissolved in a given volume.

The Molarity is expressed by:

$Molarity (M)=\frac{number of moles of solute}{dissolution volume}$

Molarity is expressed in units $\frac{moles}{liter}$ .

Then you must know the moles that represent 2.5 grams of LiNO₃.

For that you must know the molar mass of the compound. You know the atomic mass of the elements that make up the compound, obtained from the periodic table:

Li: 7 g/mol
N: 14 g/mol
O: 16 g/mol

So, taking into account the abundance of each element in the compound:

LiNO₃= 7 g/mol + 14 g/mol + 3*(16 g/mol)= 69 g/mol

Then a rule of three applies as follows: if 69 g of LiNO₃ is 1 mol of the compound, 2.5 g of LiNO₃ how many moles are there?

$moles=\frac{2.5 g*1 mole}{69 g}$

moles= 0.036

Being 60 mL = 0.06 L (1L = 1000 mL or 1 mL = 0.001 L), the molarity is calculated as:

$M=\frac{0.036moles}{0.06L}$

M=0.6 $\frac{moles}{L}$

The molarity of the solution is 0.6 $\frac{moles}{L}$

Murrr4er [49]3 years ago

6 0

Answer: hope this helps

To make molar NaCl solutions of other concentrations dilute the mass of salt to 1000ml of solution as follows:

0.1M NaCl solution requires 0.1 x 58.44 g of NaCl = 5.844g.

0.5M NaCl solution requires 0.5 x 58.44 g of NaCl = 29.22g.

2M NaCl solution requires 2.0 x 58.44 g of NaCl = 116.88g.

Explanation:

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2. Classify the following solutions as acidic, basic, or neutral at 25OC.

PilotLPTM [1.2K]

Answer: a) pH = 13.00 : basic

b) $[H_3O^+]=1.0\times 10^{-12}$ : basic

c) pOH = 5.00 : basic

d) $[OH^-]=1.0\times 10^{-9}$ : acidic

Explanation:

pH or pOH is the measure of acidity or alkalinity of a solution.

pH is calculated by taking negative logarithm of hydrogen ion concentration.

$pH=-\log [H_3O^+]$

Acids have pH ranging from 1 to 6.9 and bases have pH ranging from 7.1 to 14.Neutral substances have pH of 7.

a) pH = 13.00

As pH is more than 7, the solution is basic.

b) $[H_3O^+]=1.0\times 10^{-12}$

Putting in the values:

$pH=-\log[1.0\times 10^{-12}]$

$pH=12$

As pH is more than 7, the solution is basic.

c) pOH = 5.00

$pH+pOH=14.0$

$pH=14.0-5.00=9.00$

As pH is more than 7, the solution is basic.

d) $[OH^-]=1.0\times 10^{-9}$

Putting in the values:

$pOH=-\log[1.0\times 10^{-9}]$

$pOH=9.00$

$pH+pOH=14.0$

$pH=14.0-9.00=5.00$

As pH is less than 7, the solution is acidic.

3 0

3 years ago

29.5 g of mercury is heated from 32°C to 161°C, and absorbs 499.2 joules of heat in the process. Calculate the specific heat cap

Finger [1]

Answer:

c = 0.13 j/ g.°C

Explanation:

Given data:

Mass of mercury = 29.5 g

Initial temperature = 32°C

Final temperature = 161°C

Heat absorbed = 499.2 j

Solution:

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

Q = m.c. ΔT

ΔT = T2 - T1

ΔT = 161°C - 32°C

ΔT = 129 °C

Q = m.c. ΔT

c = Q / m. ΔT

c = 499.2 j / 29.5 g. 129 °C

c = 499.2 j / 3805.5 g. °C

c = 0.13 j/ g.°C

5 0

3 years ago

Define the law of conservation of charge and provide an example.

iren2701 [21]

Answer:

Conservation of Charge is the principle that the total electric charge in an isolated system never changes. The net quantity of electric charge, the amount of positive charge minus the amount of negative charge in the universe, is always conserved.

7 0

3 years ago

What is the term for the smallest bit into which a chemical substance can be divided and still have the properties of that subst

ziro4ka [17]

Answer:

Molecule

Explanation:

molecule of the substance. You can break the molecule down further, into the atoms that make it up, but those don't have the properties of the original 'compound'.

Here's an example:

-- Sodium is a soft, slippery metal, that explodes when water touches it.

-- Chlorine is a poisonous green gas.

When an atom of Sodium and an atom of Chlorine combine, they make one molecule of a substance called "Sodium Chloride". That's SALT ! It isn't green, it isn't a gas, it isn't poisonous, it isn't soft and slippery, and it doesn't explode when water touches it.

3 0

3 years ago

Which law was used to determine the relationship between the volume and the number of moles?

lawyer [7]

Answer:

The Mole-Volume Relationship: Avogadro's Law. A plot of the effect of temperature on the volume of a gas at constant pressure shows that the volume of a gas is directly proportional to the number of moles of that gas. This is stated as Avogadro's law.

Explanation:

4 0

3 years ago

What is the molarity of a solution prepared by dissolving 2.5 grams of LiNO3 in sufficient water to make 60.0 mL of solution?​

What is the molarity of a solution prepared by dissolving 2.5 grams of LiNO3 in sufficient water to make 60.0 mL of solution?