CHEMISTRY HIGH SCHOOL

What is the mass, in grams, of 9.16×10^24 molecules of methanol (CH3OH)?

Answers

Answer 1
Answer:

Answer:

The mass in grams is 487.5 for methanol.

Explanation:

We must calcuate the grams of a compound through the molar mass of it.

Molar mass of methanol: 32.04 g/mol

We know that 1 mol has NA molecules and they weigh 32.04 g so, this is the rule of three we must make:

6.02x10²³ molecules _____ 32.04 g

9.16x10²⁴ molecules _____ (9.16x10²⁴ . 32.04) / 6.02x10²³  = 487.5 g


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HIGH SCHOOL

How many valence electrons does dichromate ion have?

Answers

A dichromate ion has 56 valence electrons. Valence electrons are the electrons that are present in an atom which are responsible or allows the formation of a chemical bond. When you draw the lewis structure of a dichromate ions, you will have to calculate the valence electrons by (6 + 6 + 6 + 6 + 6 + 6 + 6 + 6 + 6 ) – (-2) = 56.
HIGH SCHOOL

Which spectrum of hydrogen consists of the Lyman, Balmer, and Paschen series?

Answers

Answer:

Line spectrum

Explanation:

There are two types of spectrum: Line and continuous.

In line spectrum we observe emission or absorption line at some particular wavelength range.

In case of hydrogen spectrum, initially, there were following lines observed in the emission spectrum of hydrogen:

Lyman

Balmer

Paschen

Brackett

Pfund.

So all these are the part of line spectrum of hydrogen.

I think the answer is line spectrum .  If wrong please correct me.

HIGH SCHOOL

When a ketone and its enol are in equilibrium, under most conditions the concentration of the enol is ________ the concentration of the ketone?

Answers

When a ketone and its enol are in equilibrium, under most conditions the concentration of the enol is much lower than the concentration of the ketone. This chemical equilibrium is called the keto-enol tautomerism. The keto would be in rapid equilibrium with the enol tautomer. And in this equilibrium the keto form is much stable so it predominates in the mixture. So, the concentration of the enol would be lower than that of the keto.

Answer:

Much lower than ketone is more stable than enol. N, 4-Dimethylpent -4-en-2-Amine (NH_3 protonated in acidic protoned in acidic conditions) d. [Proton cannot re extracted from OH in acidic conditions to firm O^(-)].

MIDDLE SCHOOL

What do the coefficients in front of the reactants and products in a chemical reaction represent ?

Answers

Answer:

Coefficients are used in all chemical equations to show the relative amounts of each substance present. This amount can represent either the relative number of molecules, or the relative number of moles (described below). If no coefficient is shown, a one (1) is assumed.

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