Which numbers are used? Consider the balanced chemical equation that follows. You are asked to determine how many moles of water you can produce from 4.0 mol of hydrogen and excess oxygen. (Excess oxygen means that so much oxygen is available it will not run out.) Which of the numbers that appear in the balanced chemical equation below are used to perform this calculation?
Answers
2H₂ + O₂ ⇒ 2H₂O
Since the hydrogen is the limiting reagent (meaning if the hydrogen runs out the reaction stops), we need to compare the mole ratio between hydrogen and water.
The mole ratio between H₂ and H₂O is 2:2, or 1:1 (as seen on the coefficients of the balanced equation)
And so for every mole of hydrogen, it will be equal to water. Since hydrogen is 4 moles, 4 moles of water would be created.
So we use the coefficients of H₂ and H₂O in order to answer this question.
The number of moles of H2O is proportional to the number of moles of H2 as much as 4 moles
The calculation reference is the mole of the limiting reagent of the mole of H2O is based on the mol of H2
Stokiometry in Chemistry learns about chemical reactions mainly emphasizing quantitative, such as calculation of volume, mass, number, which is related to the number of ions, molecules, elements, etc.
In chemical calculations, the reaction can be determined, the number of substances that can be expressed in units of mass, volume, mole, or determine a chemical formula, for example, the substance level or molecular formula of the hydrate.
- The reaction equation is the chemical formula of reagents and product substances
- A reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products.
- In the reactionequation there are also manifestations of reagent substances namely gas (g), liquid (liquid / l), solid (solid / s) and solution (aqueous / aq).
Known variable
4.0 mol of hydrogen and excess oxygen
Asked
the balanced chemical equation
Answer
Reactions that occur:
2H₂ + O₂ ⇒ 2H₂O
The reaction coefficient shows the mole ratio of reactants and reaction products
In determining the mole of the reaction, the calculation reference is the mole of the limiting reagent or the reagent that runs out. Because here it is stated that oxygen (O₂) is reacted under excess conditions, the hydrogen ratio becomes the limiting reagent. So the determination of the mole of H₂O is based on the mol of H₂
In the equivalent equation, the mole of H₂ and H₂O is 2: 2 or can be simplified to 1: 1, so the number of moles of H₂O is proportional to the number of moles of H₂ as much as 4 moles
Excess reactant
The percentage yield
Limiting reactant
Keywords: limiting reactant, excess, reaction coefficient, the balanced chemical equation, H₂O, O₂, H₂
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Balance the following equation. Then determine the mole ratio of Ca(OH)2:Al(OH)3.Al2(SO4)3 + Ca(OH)2 Al(OH)3 + CaSO4? A) 2:3 B) 3:2 C) 1:2 D) 3:3 E) 1:1
Answers
A) high ph and low ph
B) low and high ph
c) high and high ph
D) low and low ph
its b
Final answer:
A solution containing HCl, or Hydrochloric Acid, would likely have a low pH due to its acidic nature which greatly increases the amount of Hydronium ions in the solution and thus lowers the pH often below 7.
Explanation:
A solution containing HCl, or Hydrochloric Acid, would likely have a low pH. The pH scale measures how acidic or basic a substance is. It ranges from 0 to 14 with 7 as neutral. Since HCl is a strong acid, it will greatly increase the amount of Hydronium ions (H₃O⁺) in the solution, thus making the pH of the solution low, often below 7.
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Answers
The percent by mass of chlorine in NaCl is 60.68 % of chlorine
calculation
mass % of chlorine =mass of chlorine /mass of NaCl x 100
from periodic table the mass of cl= 35.5 g/mol
that of of Na = 23 g/mol
The mass of NaCl is therefore = 35.5 g/mol + 23 g/mol =58.5 g/mol
mass % is therefore= (35.5 / 58.5 x 100) =60.68 %
In the given question, 60.66% is the percent by mass of chlorine in NaCl.
Mass is a physical property of matter that measures the amount of substance in an object. It is typically measured in grams (g) or kilograms (kg).
The molar mass of NaCl is 58.44 g/mol. The molar mass of chlorine is 35.45 g/mol. The formula of NaCl indicates that there is one chlorine atom for every sodium atom. Therefore, the mass of chlorine in NaCl is 35.45 g/mol.
To calculate the percent by mass of chlorine in NaCl, we need to divide the mass of chlorine by the total mass of NaCl and multiply by 100. This can be expressed as follows:
Percent by mass of chlorine = (mass of chlorine/mass of NaCl) × 100
Substituting the values, we get:
Percent by mass of chlorine = (35.45 g/mol/58.44 g/mol) × 100
= 60.66%
Therefore, the percent by mass of chlorine in NaCl is 60.66%.
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Answers
1s^2 2s^2 2p^6 3s^2 3p^6 3d^2 4s^2
Answers
Answer : The correct option is, (2) 10 g of water at 55°C
Explanation :
Average kinetic energy of the gas particle is directly proportional to the temperature of the gas particle.
Formula used :
where,
R = Gas constant
T = temperature
= Avogadro's number
From this we conclude that the kinetic energy is directly proportional to the temperature where 'R' and are constant. That means kinetic energy depends only on the temperature not on the mass.
(Higher the temperature, higher will be the kinetic energy)
Hence, the average kinetic energy of water molecules is greatest in 10 g of water at 55°C.
Final answer:
The sample with the highest average kinetic energy of water molecules is (2) 10 g of water at 55°C.
Explanation:
Kinetic energy is a fundamental concept in physics that describes the energy an object possesses due to its motion. It depends on both an object's mass and its velocity. Objects in motion have kinetic energy, and the faster they move or the more massive they are, the greater their kinetic energy. This energy can be transferred or transformed but is always conserved in a closed system.
The average kinetic energy of water molecules depends on the temperature of the water. The higher the temperature, the greater the average kinetic energy. In this case, the sample with the highest average kinetic energy would be (2) 10 g of water at 55°C. This sample has a higher temperature than the other options, therefore, the water molecules in this sample have the highest average kinetic energy.
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Answers
Element’s oxidation number decrease that because that element has received electrons from another element
Explanation:
a reduction in oxidation state is known as a reduction. Such reactions include the formal removal of electrons: a net gain in electrons moving a reduction, and a clear loss of electrons being an oxidation.
An oxidation-reduction (redox) reaction is a type of synthetic reaction that involves a transfer of particles between two species. An oxidation-reduction reaction is any synthetic reaction in which the oxidation number of a molecule, atom, or ion quarters by winning or missing an electron.
hope that helps
Answers
The alkaline earth metals are all of the elements in the second column (column 2A) of the periodic table. This group includes beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba) and radium (Ra). Alkaline earth metals have only two electrons in their outermost electron layer
The right answer is B