An aqueous solution of methyl alcohol (molar mass = 32.05 g/mol) is prepared by dissolving 15.0 mL of the alcohol (d = 0.792 g/mL) in 75.0 mL of water (1.00 g/mL).a. Calculate the mass % of the aqueous alcohol solution.
b. Calculate the molarity of the aqueous alcohol solution.
c. If 5.0 mL of the solution (above) is diluted to a volume of 50.0 mL, what is the molarity (M) of the resulting dilute solution?

Answer:

2.89 × 10²³ atoms of zinc

Explanation:

The number of atoms of zinc can be found by using the formula

N = n × L

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

N = 0.48 × 6.02 × 10²³

We have the final answer as

2.89 × 10²³ atoms of zinc

Hope this helps you

Answer:

2.89× 10²³ atom

Explanation:

Given data:

Number of atoms of Zn = ?

Number of moles of Zn = 0.48 mol

Solution:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.  The number 6.022 × 10²³ is called Avogadro number.

For example,

1 mole = 6.022 × 10²³ atom

0.48 mol ×  6.022 × 10²³ atom / 1mol

2.89× 10²³ atom

The book that influenced Giordano Bruno's idea of an infinite universe was 'De revolutionibus orbium coelestium' by Nicolaus Copernicus. It opposed the geocentric model, leading to Bruno's emphasis on the infinite universe theory. Though banned, the book wielded substantial impact.

The book that Giordano Bruno read, which gave him the idea that the Universe was infinite, was 'De revolutionibus orbium coelestium' ('On the Revolutions of the Heavenly Spheres') written by Nicolaus Copernicus. Belonging to the heliocentric theory, the book challenged the geocentric model in which Earth was at the universe's core. Bruno emphasized the argument of an infinite universe presented in the text, which ultimately got him into trouble with the Inquisition. Despite being banned, its impact on Bruno and scientific thought was significant.

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Answer:

14.71 g/cm³

Explanation:

The density of a substance can be found by using the formula

volume = final volume of water - initial volume of water

volume = 36.5 - 31.4 = 5.1 mL

But

1 mL = 1 cm³

5.1 mL = 5.1 cm³

From the question we have

We have the final answer as

14.71 g/cm³

Hope this helps you

Final answer:

The Lewis structure for the molecule CH3CH2NH3+ (ethylammonium) showcases hydrogen atoms bonded to carbon and nitrogen atoms. The positive charge resides on the nitrogen atom.

Explanation:

The molecule CH3CH2NH3+ is also known as ethylammonium, a form of a substituted ammonium ion. The Lewis structure of this molecule can be drawn based on the concept that hydrogen has one bond, carbon has four bonds, and nitrogen has three bonds and one lone pair of electrons. The positive charge in CH3CH2NH3+ is located on the nitrogen atom.

Here’s a simple way to draw it:

1. Draw a C atom connected to three H atoms, signifying the CH3 group.

2. Draw another C atom bonded to the first C and two H atoms, signifying the CH2 group.

3. Draw the N atom connected to the second C and three H atoms, signifying the NH3 group.

4. Mark a + sign near the N atom to indicate the positive charge.

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