All categories

3 years ago

Convert 1.39 x 10^24 atoms of carbon to moles of carbon

2 answers:

8 0

If 1mol ------- is ----------- 6,02×10²³
so x ------- is ----------- 1,39×10²⁴

$x=\frac{1,39*10^{24}*1mol}{6,02*10^{23}}\approx2,31mol$

Delicious77 [7]3 years ago

7 0

Answer is: there are 2.308 moles of carbon.

N(C) = 1.39·10²⁴; number of carbon atoms.

n(C) = N(C) ÷ Na.

n(C) = 1.39·10²⁴ ÷ 6.022·10²³ 1/mol.

n(C) = 2.308 mol; amount of carbon atoms.

Na is Avogadro number or Avogadro constant (the number of particles, in this example carbon, that are contained in the amount of substance given by one mole).

You might be interested in

If a sample contains 74.0% of the R enantiomer and 26.0% of the S enantiomer, what is the enantiomeric excess of the mixture?

Vanyuwa [196]

Answer:

The enantiomeric excess of the mixture is 48%

Explanation:

Enantiomeric excess refers to the excess of one enantiomer over the other in a mixture of enantiomers.

Enantiomeric excess = % of major enantiomer (R) - % of minor enantiomer (S)

= 74% - 26% = 48%.

4 0

3 years ago

You make up a solution of a diprotic acid, H2A, having pKa values of 5.0 and 9.0. Identify the primary, secondary, and tertiary

andrezito [222]

Answer:

Explanation:

A solution with a pH value of 7 is neutral i.e neither acidic nor alkaline. A solution with a pH less than 7 is said to be acidic, while one with a pH value more than 7 is alkaline. Acidity increases as the value decrease below 7, while alkalinity increases as the value increase about 7.

Given that H2A is a diprotic weak acid have pKa values of 5.0 ad 9.0, it will undergo dissociation in the solution as:

NOTE: These reactions are reversible reactions.

$\mathbf{H_2A \to H^+ + HA^- \ \ \ pKa = 5.0}$

$\mathbf{HA^- \to H^+ +A^{2-} \ \ \ pKa = 9.0}$

Thus;

The primary species is HA⁻

The secondary species is A²⁻

6 0

3 years ago

Chemical properties can be what there's 2 types what is 2 types of chemical properties ?

goldfiish [28.3K]

Chemical reaction - The chemical reactions are classified into different classes depending upon the type of chemical changes take place these reactions are as follows:

 Combination reaction 

Combination reaction - A reaction in which two are more reactance combined to form a single product is call combination reaction

calcium oxide reacts vigorously with water to form calcium hydroxide the reaction is highly exothermic a lot of heat is produced during the reaction
CaO(s) + H2O(l) -------------- CH3OH(l)

 Decomposition Reaction 

Decomposition reaction - aur reaction in which a single reactant breakdown to form two or more products is known as decomposition reaction this reaction is opposite to combination reaction on the basis of the form of energy required for the reaction this reaction of three types

thermal decomposition this reaction use the energy in the form of heat for the decomposition of reactant
Electrolysis these reactions involves the use of electrical energy for the decomposition of the reactant molecules
Photolysis these reactions involved the use of light energy for the purpose of decomposition

 Displacement reaction 

Displacement Reaction - when a more reactive element displays less reactive element from its compound it is called displacement reaction.This is of types.

Single displacement reaction - it is a type of chemical reaction where an element reacts with the compound and takes the place of another element in that compound is called single displacement Zn + cuso4 --------- ZnSO4 + cu

Double displacement reaction - the reaction in which two different oils or group of atom in the reactant molecules are displaced by each other is called double displacement reaction it is also called precipitation reaction as precipitate is produced in such reactions

 Oxidation and reduction  

Oxidation - it is the process in which oxygen is added to a substance or hydrogen is removed from a substance

Reduction - it is the process in which oxygen is removed from a substance or hydrogen is added to a substance

Redox reaction - these are the reactions in which oxidation and reduction takes place simultaneously or call redox reaction

Endothermic and Exothermic

Endothermic - the reaction which are a complaint by the evolution of heat are called exothermic reaction all the reaction in which heat is released along with the formation of product are called exothermic reaction

Endothermic - the reaction which occur by the absorption of heat energy either in the form of light electricity are called endothermic reaction

Hope it helps u

3 0

3 years ago

Read 2 more answers

Two samples of carbon come into contact. Heat will transfer from Sample A to Sample B if the average kinetic energy of Sample A'

Eddi Din [679]

Answer:

The right word to fill the blank space is GREATER THAN.

Explanation:

In nature, heat in form of temperature is usually transfer from the region of higher temperature to the region of lower temperature. Thus, for heat to be transfer from one substance to another one, the temperature will flow from the body with the higher temperature to that which has a lower temperature, the substance that is giving out the heat must have a higher temperature.

3 0

3 years ago

Read 2 more answers

A student mixes 1.0 mL of aqueous silver nitrate, AgNO3 (aq), with 1.0 mL of aqueous sodium chloride, NaCl (aq), in a clean test

Lubov Fominskaja [6]

Answer:

AgCl (silver Chloride) is being precipitated out as white and cloudy crystals.

Explanation:

If a student mixes 1.0 mL of aqueous silver nitrate AgNO3 (aq) with 1.0 mL of aqueous sodium chloride, NaCl (aq), in a clean test tube.

The sodium chloride is being acidified with dilute trioxonitrate (V) acid. Then a few drops of silver trioxonitrate(V) is added afterwards. A white precipitate of silver chloride, which dissolves readily in aqueous ammonia indicates the presence of sodium chloride.

The reaction proceeds as follows:

$\mathtt{AgNO_{3(aq)} + NaCl _{(aq)} \to AgCl _{(s)} + NaNO_3_{(aq)}}$

From the reaction between AgNO3 (aq) and NaCl (aq), AgCl (silver Chloride) is being precipitated out as white and cloudy crystals.

4 0

3 years ago