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4 years ago

WILL GIVE POINTS

Chemistry

1 answer:

Veronika [31]4 years ago

7 0

Answer:A.products

Explanation:A chemical reaction is the process in which atoms present in the starting substances rearrange to give new chemical combinations present in the substances formed by the reaction. These starting substances of a chemical reaction are called the reactants, and the new substances that result are called the products.

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What is the molarity of a solution prepared by diluting 250 mL of a 40% H2SO4 solution to 1 Liter? The density of the stock solu

kiruha [24]

Answer:

1.195 M.

Explanation:

We can calculate the concentration of the stock solution using the relation:

<em>M = (10Pd)/(molar mass).</em>

Where, M is the molarity of H₂SO₄.

P is the percent of H₂SO₄ (P = 40%).

d is the density of H₂SO₄ (d = 1.17 g/mL).

molar mass of H₂SO₄ = 98 g/mol.

∴ M of stock H₂SO₄ = (10Pd)/(molar mass) = (10)(40%)(1.17 g/mL) / (98 g/mol) = 4.78 M.

We have the role that the no. of millimoles of a solution before dilution is equal to the no. of millimoles after dilution.

<em>∴ (MV) before dilution = (MV) after dilution</em>

M before dilution = 4.78 M, V before dilution = 250 mL.

M after dilution = ??? M, V after dilution = 1.0 L = 1000 mL.

∴ M after dilution = (MV) before dilution/(V after dilution) = (4.78 M)(250 mL)/(1000 mL) = 1.195 M.

3 0

3 years ago

HELPPPP PLEASEEEE

Rama09 [41]

1.025 moles of NaCl are present in a solution with a molarity of 8.20M and 125 mL of solution. Details about molarity can be found below.

<h3>How to calculate molarity?</h3>

The number of moles of a solution can be calculated by multiplying the molarity of the solution by its volume. That is;

no of moles = molarity × volume

According to this question, a solution has a molarity of 8.20M and volume of 125 mL of solution.

no of moles = 8.20 × 0.125

no of moles = 1.025moles

Therefore, 1.025 moles of NaCl are present in a solution with a molarity of 8.20M and 125 mL of solution.

Learn more about number of moles at: brainly.com/question/14919968

#SPJ1

6 0

2 years ago

The density of lead is

Mademuasel [1]

Answer : The volume occupied by lead is, 2.20 mL

Explanation :

Density : It is defined as the mass contained per unit volume.

Formula used for density :

$Density=\frac{Mass}{Volume}$

Given :

Mass of an lead = 25.0 grams

Density of lead = 11.34 g/mL

Now put all the given values in the above formula, we get the volume of lead.

$11.34g/mL=\frac{25.0g}{Volume}$

$Volume=2.20mL$

Therefore, the volume occupied by lead is, 2.20 mL

3 0

3 years ago

Ammonia is a?<br> Base<br> Acid<br> Ketone<br> Ester

BaLLatris [955]

Answer:

it is a base

Explanation:

8 0

3 years ago

A lab technician has 45L gas in a flexible container at a pressure of 100.0 kPa. If the technician decreases the pressure to 60.

ICE Princess25 [194]

Answer:

75 L

Explanation:

We assume that the gas in the container is an ideal gas, which is governed by the ideal gas equation : PV = nRT , where P is the pressure of the gas, V is the volume of the container, n is the number of mols of the gas, R is the universal gas constant and T is the temperature of the gas.

Here, R is a universal constant with a value of ≈ 8.314 J/mol-K. Also, given that temperature (T) is maintained constant. And since the container is closed, there is no exchange of the gas between the container and the surroundings, thus keeping the number of mols (n) of the gas constant. Hence, in the ideal gas equation, right hand side, i.e, nRT is a constant.

Initially the equation is: $P_{1}V_{1} = nRT(constant)$