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3 years ago

What is the empirical and molecular formula of caffeine

Chemistry

1 answer:

Natalija [7]3 years ago

4 0

Molecular
C8H10N4O2

Empirical
C4H5N2O

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What is the mass of 1.75 moles of HF?

olganol [36]

Answer:

Mass = 35.02 g

Explanation:

Given data:

Number of moles = 1.75 mol

Mass of HF = ?

Solution:

Formula:

Mass = number of moles × molar mass

Molar mass of HF = 20.01 g/mol

by putting values,

Mass = 1.75 mol × 20.01 g/mol

Mass = 35.02 g

7 0

3 years ago

An example of polytamic anoin would be a. Ca+2 b. NH4+ c. F d. PO4-3

ella [17]

$PO_4^{-3}$ and $NH^{4+}$ are polyatomic anions composed of two or more atoms.

<h3>What is a polyatomic anion?</h3>

A polyatomic ion is an ion composed of two or more atoms. Examples: The hydroxide cation ( $OH^-$ ) and the phosphate cation ( $PO_4^{3-}$ ) are both polyatomic ions.

$PO_4^{-3}$ and $NH^{4+}$ are the polyatomic anions because both contain more than 1 atom.

Hence, $PO_4{-3}$ and $NH^{4+}$ are polyatomic anions composed of two or more atoms.

Learn more about the polyatomic anion here:

brainly.com/question/13544727

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8 0

2 years ago

As the randomness of a system increases, the entropy of the system:

aev [14]

Answer:

it most likely increases

6 0

3 years ago

Use the Henderson-Hasselbalch equation and your knowledge of ionization to help you answer this question. Aspirin is a weak acid

Leya [2.2K]

Answer:

The protonated form is predominant when aspirin is absorbed more readily. The ratio of conjugate base to acid is 1 to 100.

Explanation:

Aspirin is more readily absorbed when it is protonated, that is when pH is lower than pKa (<em>more H⁺ available in the medium</em>). We can confirm this using Henderson-Hasselbalch equation for pH = 1.5:

$pH = pKa +log(\frac{conjugate base}{weak acid} )\\1.5=3.5 +log(\frac{conjugate base}{weak acid} )\\-2.0=log(\frac{conjugate base}{weak acid} )\\10^{-2.0} =\frac{conjugate base}{weak acid}\\\frac{conjugate base}{weak acid}=0.01=\frac{1}{100}$

When aspirin is absorbed more readily the ratio of conjugate base to acid is 1 to 100, being the acid the <em>predominant</em> form.

6 0

3 years ago

Which of the following is true about mixtures and compounds? A compound forms when different substances chemically combine to fo

Musya8 [376]

All of these are true

6 0

3 years ago

Read 2 more answers