A solution of 0.0027 M K2CrO4 was diluted from 3.00 mL to 100. mL. What is the molarity of the new solution?

Chemistry

1 answer:

Stells [14]3 years ago

4 0

Answer:

[K₂CrO₄] → 8.1×10⁻⁵ M

Explanation:

First of all, you may know that if you dilute, molarity must decrease.

In the first solution we need to calculate the mmoles:

M = mmol/mL

mL . M = mmol

0.0027 mmol/mL . 3mL = 0.0081 mmoles

These mmoles of potassium chromate are in 3 mL but, it stays in 100 mL too.

New molarity is:

0.0081 mmoles / 100mL = 8.1×10⁻⁵ M

You might be interested in

Ten grams of a gas occupies 12.5 liters at a pressure of 42.0 cm Hg. What is the volume when the pressure has increased to 75.0

Fantom [35]

Based on the question, it is evident that the question is based on Boyle's Law which we will use to find the answer necessary.

Now, Boyle's Equation: P₁V₁ = P₂V₂

V₂ = P₁V₁ ÷ P₂

∴ V₂ = (12.5L × 42.0 cm · Hg) ÷ 75 cm · Hg

⇒ V₂ = 7 L

Thus, the <span>volume when the pressure has increased to 75.0 cm Hg is 7 Litres.</span>

8 0

3 years ago

The human hand has a unique adaptation called....?

topjm [15]

Answer:

Humans, as well as monkeys, gorillas, and other primates, have a hand that can grip and grasp objects because they have an opposable thumb. The earliest primates were arboreal (they climbed trees), and so having grasping hands was an advantage in this environment.

5 0

3 years ago

Sound travels most quickly through? a gas, liquid. Solid

aleksley [76]

Answer:

solids

Explanation:

through solids because the molecules are closer together

4 0

3 years ago

Read 2 more answers

3. A 0.5L container of Nitrogen (N) gas at 18 degrees Celsius is heated under constant pressure to the boiling point of water. W

ExtremeBDS [4]

The volume increased to 0.64 L on increasing the temperature to boiling point of water.

<u>Explanation:</u>

One of the important laws used for understanding the kinetics of gas particles is Charle's law. It states that the volume occupied by gas molecules will be directly proportional to the Kelvin temperature of the molecules at constant pressure.

Volume ∝ Kelvin Temperature at constant Pressure

So, in this case, the initial volume of the container in which Nitrogen gas is kept is given as 0.5 L and the initial temperature of the Nitrogen gas is said to be 18°C.

Now the container is heated to boiling point of water which is 100°C, then the volume occupied by the gas should increase as per Charle's law.

$\frac{V_{1} }{T_{1} } = \frac{V_{2} }{T_{2} }$