How would you prepare 2.5 L of a 0.800M solution of KNO3?

Answers

Answer 1

Answer: First find the mass of solute:

Molar mass KNO₃ = 101.1032 g/mol

mass = Molarity * molar mass * volume

mass = 0.800 * 101.1032 * 2.5

mass = 202.2064 g of KNO₃

To prepare 2.5 L (0800 M) of KNO3 solution, must weigh 202.2064 g of salt, dissolve in a Beker, transfer with the help of a funnel of transfer to a volumetric flask, complete with water up to the mark, capping the balloon and finally shake the solution to mix.

hope this helps!

Related Questions

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A change in the number of protons or neutrons occurs in which type of reaction?A: electrochemical reaction B: thermochemical reaction C: nuclear reaction D: chemical reaction
Which process occurs at the anode in an electrochemical cell?(1) the loss of protons (2) the loss of electrons (3) the gain of protons (4) the gain of electrons
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The temperature of a sample of matter is ameasure of the (1) average potential energy of the particles of the sample (2) average kinetic energy of the particles of the sample (3) total nuclear energy of the sample (4) total thermal energy of the sample

Which of the following molecules has a bent structure?A. O2
B. CO2
C. H2O
D. CH4

Answers

Answer : The correct option is, (C) $H_2O$

Explanation :

Formula used:

$\text{Number of electrons}=(1)/(2)[V+N-C+A]$

where,

V = number of valence electrons present in central atom

N = number of monovalent atoms bonded to central atom

C = charge of cation

A = charge of anion

First we have to determine the hybridization of the following molecules.

(a) $O_2$

This is diatomic molecule and diatomic molecules always form linear shape.

(b) $CO_2$

$\text{Number of electrons}=(1)/(2)* [4]=2$

The number of electrons is 2 that means the hybridization will be $sp$ and the electronic geometry of the molecule will be linear.

(c) $H_2O$

$\text{Number of electrons}=(1)/(2)* [6+2]=4$

The number of electrons is 4 that means the hybridization will be $sp^3$ and the electronic geometry of the molecule will be tetrahedral.

But as there are two atoms around the central oxygen atom, the third and fourth position will be occupied by lone pair of electrons. The repulsion between lone and bond pair of electrons is more and hence the molecular geometry will be bent.

(d) $CH_4$

$\text{Number of electrons}=(1)/(2)* [4+4]=4$

The number of electrons is 4 that means the hybridization will be $sp^3$ and the electronic geometry of the molecule will be tetrahedral.

Hence, the molecule has bent structure will be, $H_2O$

H2O has a bent structure. The oxygen atom is in the center, and the hydrogen atoms are attached but pointing downward. It's not linear because there are two unshared pairs of electrons on oxygen that take up their own spaces.

Which two particles in an atom have the same mass ? protons and electrons or protons and neutrons

Answers

Protons and neutrons have about the same mass. Electrons are the smallest out of the three, in fact, protons weigh 1,836 times more than an electron.

21 Which mathematical expression represents the heat of reaction for a chemical reaction?(1) (the heat of fusion) – (the heat of vaporization)(2) (the heat of vaporization) – (the heat of fusion)
(3) (the potential energy of the products) – (the potential energy of the reactants)
(4) (the potential energy of the reactants) – (the potential energy of the products)

Answers

Correct Answer: Option 3 i.e. (the potential energy of the products) – (the potential energy of the reactants)

Reason:
Heat of reaction for a chemical reaction is the change in the enthalpy of a chemical reaction that occurs at a constant pressure. This can be measured on the basis of potential energy of reactants and products. Mathematically, it is expressed as:

Heat of reaction = ΔH = ΣH products - ΣHr reactants.

The answer is (3) the potential energy of the products - the potential energy of the reactants. The reaction energy production can be represented by the change of energy of products and reactants.

What element has 81 protons in the nuclei of its atoms? A. Platinum
B. Uranium
C. Lead
D. Thallium

Answers

Thallium has got 81 protons

Have a nice days.......

Thallium has 81 protons in the nuclei of its atoms.

Which property is best to use when determining the strength of an ionic bond in a solid? lattice energy conductivity hardness solubility

Answers

The property best used when determining the strength of an ionic bond in a solid is:

LATTICE ENERGY

The lattice energy is the energy released during the deposition of gaseous ions of opposite charges. Deposition is the transformation of gas to solid.

Explanation:

The main types of solids are ionic, molecular, covalent, and hard. Ionic solids consist of absolutely and negatively energized ions held concurrently by electrostatic forces; the power of the bonding is indicated in the lattice energy. Ionic solids manage to have high melting points and are fairly hard. lattie energy is a stratagem of the energy received in the crystal lattice of a compound, similar to the energy that would be delivered if the element ions were produced together from infinity.

Answer:

A. lattice energy

Explanation:

A droplet of pure mercury has a density of 13.6 g/cm^3. What is the density of a sample of pure mercury that is 10 times as large as the droplet?

Answers

The only thing you need to solve it is to know that
density = mass or volumes
It does't matter which mass do you have- density is always the same, therefore 13.6 g/cm^3×10

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