CHEMISTRY HIGH SCHOOL

What is the molarity of a solution of 14.0 g NH4Br in enough H2O to make 150 mL of solution?

Answers

Answer 1

Answer:

Explanation:

Molarity is defined as the number of moles per liter of solution.

Mathematically, Molarity = $(no. of moles)/(volume of solution in liter)$

Since it is given that the molarity of a solution of 14.0 g and volume is 150 mL or 0.15 L.

Whereas number of moles = $(mass)/(molar mass)$

So, molar mass of $NH_(4)Br$ is 97.94 g/mol.

Thus, number of moles = $(14.0 g)/(97.94 g/mol)$

= 0.142 mol

Therefore, calculate the molarity as follows.

Molarity = $(no. of moles)/(volume of solution in liter)$

= $(0.142 mole)/(0.15 L)$

= 0.946 mol/L

Hence, we can conclude that molarity of the solution is 0.946 mol/L.

Answer 2

Answer:

Final answer:

The molarity of the solution is approximately 0.952 M.

Explanation:

To calculate the molarity of the solution, we need to convert the given mass of NH4Br to moles. The molar mass of NH4Br is 97.94 g/mol. So, 14.0 g of NH4Br is equal to 0.143 mol. Next, we convert the given volume of the solution to liters, which is 0.150 L. Finally, we divide the number of moles by the volume in liters to find the molarity.

Molarity (M) = moles/volume (L)

Therefore, the molarity of the solution is approximately 0.952 M.

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The element carbon, nitrogen, and oxygen are all part of the same?

Answers

The elements carbon, nitrogen and oxygen are all part of the same row or period on the periodic table of elements.

An example of an atom that has no charge is one that hasA. 1 proton, 2 electrons, and 3 neutrons.
B. 3 protons, 1 electron, and 3 neutrons.
C. 2 protons, 2 electrons, and 1 neutron.
D. 3 protons, 2 electrons, and 1 neutron.

Answers

For an atom to have no charge, that is neutral, the number of electrons should be the same to the number of electrons. If the number of electron is more than the number of proton, the atom is negatively charged. Also, when the number of proton is more than the number of electron, the atom is positively charged. The answer to this item is letter C.

An atom consists of a postively charged nucleus that is surrounded by a negatively charged cloud of electrons . The nucleus consists of positvely charged protons and charge-neutral neutrons. An example of an atom that has no net charge is one that has two protons, two electrons and one neutron (Answer C).

A hydrogen ion, H+, in aqueous solution may also be written as(1) H2O (3) H3O+
(2) H2O2 (4) OH–

Answers

Answer: Option (3) is the correct answer.

Explanation:

In an aqueous solution, a compound exists in the form of ions that is in the form of protons and electrons.

Protons are positively charged and electrons are negatively charged. A proton (usually hydrogen ion, $H^(+)$ ) in water (solvent) also exists as $H_(3)O^(+)$ .

For example, $H_(2)O + HCl \rightleftharpoons H_(3)O^(+) + Cl^(-)$

This shows that the conjugate acid of $H_(2)O$ is $H_(3)O^(+)$ .

Thus, we can conclude that a hydrogen ion, H+, in aqueous solution may also be written as $H_(3)O^(+)$ .

The answer is (3) H3O+. In solution, H+ exists interchangeably bound to H2O (as the hydronium ion) and as a free ion. Some books represent strong acids in net ionic equations as simply H3O+

How does an ion differ from an atom?

Answers

An atom is the smallest particle of an element that retains the chemical properties of the element. Atoms are electrically neutral, with a positively charged nucleus that binds one or more electrons in motion around it.An ion-An atom or molecule that has acquired a charge by either gaining or losing electrons. An atom or molecule with missing electrons has a net positive charge and is called a cation*; one with extra electrons has a net negative charge and is called an anion*.

Final answer:

An ion differs from an atom in that it has a net electrical charge, either positive or negative, due to the loss or gain of electrons.

Explanation:

An ion differs from an atom in that it has a net electrical charge. This charge is either positive or negative, resulting from the loss or gain of electrons by the atom. When an atom loses electrons, it becomes positively charged and forms a cation. On the other hand, when an atom gains electrons, it becomes negatively charged and forms an anion.

For example, let's consider sodium (Na) and chloride (Cl) atoms. Sodium has 11 protons and 11 electrons, making it neutral. However, when it loses an electron, it becomes a sodium ion (Na+), which now has 11 protons and 10 electrons, giving it a +1 charge. Chloride, on the other hand, has 17 protons and 17 electrons, making it neutral. But when it gains an electron, it becomes a chloride ion (Cl-), which now has 17 protons and 18 electrons, giving it a -1 charge.

So, while an atom is electrically neutral, an ion has a charge due to the loss or gain of electrons.

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How many mole are in 2.84*10^22 molecules of h2

Answers

Avogadro's Number and the Mole. The mole is represented by Avogadro's number, which is 6.022×1023 atoms or molecules per mol.

Determine the mass of 2.5 cups of water if the density of water is 1.00 g/cm^3 and 1 cup = 240 mL

Answers

1) we find out the volume of the water.
Remember: 1 ml=1 cm³
Volume of the water=number of cups x volume of one cup.
Volume of the water=2.5(240 ml)=600 ml=600 cm³

Density=mass/volume ⇒ mass=density x volume

2) we calculate the water mass of 600 cm³ of water.
mass=density x volume
mass=(1 g/cm³)(600 cm³)=600 g.

Answer: the mass of 2.5 cupas of water is 600 g.

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