How many mol of hydrogen in 2.6 mol of caffein

Answers

Answer 1

Answer: The chemical formula of caffeine is C8H10N4O2. Caffeine is only a common name but using IUPAC, it is given the nomenclature 1,3,7-Trimethylpurine-2,6-dione. 1 mole caffeine has 10 moles of hydrogen (as shown in the chemical formula) hence, 2.6 moles caffeine has 26 moles of hydrogen.

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Which substance can not be broken down by a chemical reaction?(1) ammonia (3) methane
(2) argon (4) water

Answers

The substance that cannot be broken down by a chemical reaction is argon. This is because the substance is an element, otherwise if this is a compound, then it can be still broken down by chemical means. Ammonia, methane and water are all compounds.

The substance that cannot be broken down by chemical reaction is $\boxed{\left( 2 \right){\text{ argon}}}$ .

Further Explanation:

Substance is the pure form of matter while combination of atoms or molecules is termed as a mixture.

Types of substances:

1. Element

The simplest form of substance that cannot be further broken down by any chemical method is known as an element. Carbon, sulfur, and cobalt are some of the examples of elements.

2. Compound

When two or more different elements are held together by chemical bonds, compounds are formed. These can further be broken down into their respective constituents. Their properties are quite different from those of their constituent elements. NaCl, ${\text{C}}{{\text{H}}_{\text{4}}}$ and ${{\text{H}}_{\text{2}}}{\text{O}}$ are examples of compounds.

(1) Ammonia consists of one nitrogen and three hydrogen atoms so it is a compound. Therefore it can be broken down by chemical reactions.

(2) Argon is an element so it is the simplest form in which it can exist. Therefore it cannot be broken down by chemical reactions.

(3) Methane consists of one carbon and four hydrogen atoms so it a compound. Therefore it can be broken down by chemical reactions.

(4) Water consists of one oxygen and two hydrogen atoms so it is a compound. Therefore it can be broken down by chemical reactions.

Learn more:

Which sample is a pure substance? brainly.com/question/2227438
Which is a characteristic of a mixture? brainly.com/question/1917079

Answer details:

Grade: High School

Subject: Chemistry

Chapter: Elements, compounds, and mixtures

Keywords: substance, methane, argon, ammonia, water, element, compound, chemical reactions, broken down, simplest form, NaCl, CH4, carbon, sulfur, cobalt.

If you want to make 0.5 L of a 0.01 M solution of bromine (Br2) in water, how much bromine would you need? A. 0.8 grams. . B. 0.8 moles. . C. 1.6 grams. . D. 1.6 moles.

Answers

The answer is A. 0.8 grams.

The atomic mass of bromine is: A(Br) = 80
The molecule Br₂ consists of 2 Br atoms. Thus, the molecular mass of bromine is: Mr(Br₂) = 2*A(Br) = 2*80 = 160
This means there are 160 grams/l of Br₂ in 1 M.

Let's write a proportion. If 160 grams/l of Br₂ are present in 1 M, how much of Br₂ will be in 0.01 M:
160 g/l : 1 M = x : 0.01 M
After crossing the products:
x = 80 * 0.01 = 1.6 g/l

Let's write another proportion. If there are 1.6 g of Br₂ in 1 liter, how many of Br₂ will be present in 0.5 liter:
1.6 g : 1 l = x : 0.5
After crossing the products:
x = 1.6 * 0.5 = 0.8 g

Increasing the ? of a solvent increases the solubility of the solute

Answers

There are a lot of ways to increase the solubility of the solute. Increasing the temperature, mixing time and surface area of a solvent increases the solubility of the solute

The answer is temperature

Which metal is more active than NI and less active than Zn?1. Cu
2. Cr
3. Mg
4. Pb

Answers

Answer : The correct option is, (2) Cr (Chromium)

Explanation :

The reactivity series of metal are arranged of the reactivity from the highest to the lowest. Reactivity series is used to determine the products of the single displacement reactions. In the single displacement reaction, the most reactive metal displaces the least reactive metal.

From the given reactivity series we conclude that there are two metal (Mg and Cr) are more reactive metal than the Ni and there are two metal (Pb and Cr) are less reactive metal than the Zn. So, the Cr (Chromium) is the metal which is more active than Ni and less active than Zn.

Hence, the correct option is, (2) Cr

Cr is more active than nickel and less active than zinc.

What is the approximate hydronium ion concentration and hydroxide ion concentration in a cup of tea? Which is higher?

Answers

suppose pH = 5 then pOH = 14-5 = 9
[OH-] = 10^-pOH
= 10^-9
= 1.00x 10^-9
hope it helps

The negative log of hydrogen or hydronium ions concentration gives the pH of the solution. The concentration of hydronium is more than the hydroxide ions.

What are pH and pOH?

The pH of the solution is the concentration of the hydrogen or the hydronium ion in the aqueous solution, whereas the concentration of the hydroxide ion in the solution gives the pOH.

Let the pH of the tea = 5 then,

The concentration of hydronium ion is calculated as:

$\begin{aligned}\rm pH &=\rm -log[H_(3)O^(+)]\n\n\rm [H_(3)O^(+)] &= \rm 10^(-pH)\n\n&= 10 ^(-5)\end{aligned}$

The concentration of hydroxide ion is calculated as:

$\begin{aligned} \rm pH &= \rm 14 - pOH \n\n&= 14 - 5\n\n&= 9\end{aligned}$

Calculating further:

$\begin{aligned}\rm pOH &= \rm -log[OH^(-)]\n\n\rm [OH^(-)]& =\rm 10^(-pOH)\n\n&= 10^(-9)\end{aligned}$

Therefore, the concentration of the hydronium ion is much higher than that of the hydroxide ion.

Learn more about pH and pOH here:

brainly.com/question/10406150

The concentration 12 g/L means there are 12 g of solute present in__________of solution.

Answers

12 because the beach is blue and yea

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