Answers
Answer:
–4020 KJ
Explanation:
The following data were obtained from the question:
H₂(g) + F₂(g) —> 2HF(g) ΔH = –536 KJ
Next, we shall determine the mass of H₂ that reacted from the balanced equation to produce –536 KJ of heat energy. This can be obtained as follow:
Molar mass of H₂ = 2 × 1 = 2 g/mol
Mass of H₂ from the balanced equation = 1 × 2 = 2 g.
Summary:
From the balanced equation above,
2 g of H₂ reacted to produce –536 KJ of heat energy.
Finally, we shall determine the heat change produced by the reaction of 15 g of H₂. This can be obtained as follow:
From the balanced equation above,
2 g of H₂ reacted to produce –536 KJ of heat energy.
Therefore, 15 g of H₂ will react to produce = (15 × –536)/2 = –4020 KJ of heat energy.
Thus, the heat change for the reaction is –4020 KJ
Related Questions
how many grams of sodium carbonate must react with 222 g of calcium chloride to make 233 grams of sodium chloride and 201 grams of calcium carbonate?
Answers
Answer: 212 g of sodium carbonate must react
Explanation:
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products formed must be equal to the mass of reactants taken.
In order to get the same mass on both sides, the atoms of each element must be balanced on both sides of the chemical equation.
The balanced chemical equation is:
[tex]Na_2CO_3+CaCl_2\rightarrow 2NaCl+CaCO_3[/tex]
Mass of products = mass of sodium chloride + mass of calcium carbonate = 233 g+ 201 g= 434 g
Mass of reactants= mass of sodium carbonate + mass of calcium chloride =x + 222 g
As the mass of reactants should be equal to mass of products
434 = x + 222 g
x = 212 g
Thus 212 g of sodium carbonate must react with 222 g of calcium chloride to make 233 grams of sodium chloride and 201 grams of calcium carbonate
What is meant by the dual wave-particle nature of light?
Answers
Dual wave particle nature of light can be regarded as mechanism that says light and matter will also has the properties of waves as well as that of particles.
This concept is found in mechanics as it describes how light and matter also has the properties associated with waves as well as particles.The duality explained inadequacy of conventional concepts of both wave and particle so as to give explanation about behaviour of quantum objects.the dual nature of light made us to understand that light has wave properties and it also has particle properties.Some of the properties of wave that light has are:
wavelengthspeedTherefore, duality means have both characteristics of light and wave
Learn more at,: https://brainly.com/question/14326678?referrer=searchResults
What type of
energy travels in the form of electromagnetic waves?
A: Chemical Energy
B: Gravitational Energy
C: Nuclear Energy
D: Radiant Energy
Answers
Answer:
Radiant Energy
Explanation:
Radiant energy is created through electromagnetic waves
PLEASE HELP ASAP!!!
A teacher wrote the following part of a chemical equation involving water (H2O) and carbon dioxide (CO2): H2O + CO2 ---> ?
What is the most likely result of the chemical reaction represented by this equation?
A. H2CO3
B. NaCl
C. HNO3
D. H2Ca3
Answers
Answer:
Id say A. I think I hope I'm right
What three types of particles make up an atom? What are their charges?
Answers
Answer:
Protons, neutrons, and electrons are the three main subatomic particles found in an atom. Protons have a positive (+) charge. An easy way to remember this is to remember that both proton and positive start with the letter "P." Neutrons have no electrical charge.
Answer:
Protons, positive charge
Neutrons, neutral
Electrons, negative charge
Explanation:
Write an informal definition of half-life.
Answers
the time required for the activity of a substance taken into the body to lose one half its initial effectiveness. Informal. a brief period during which something flourishes before dying out.
hope this helps ^^
Is Mg(CH3COO)2 soluble or insoluble
Answers
Answer:
It is Soluble
Explanation:
Name- Magnesium acetate
It dissolves easily in water and alcohol.
How is elevation shown on a topographic map?
O intermediate contours
O index contours
O contour intervals
Ocontour lines
Answers
Answer:
D. Contour lines.
Explanation:
The primary difference is that they show elevation in detail. Characteristics of topographic maps include: they show elevation using contour lines. Put simply, a contour line is a line which joins points of equal elevation above sea level.
What can be concluded from the statements above?
A. A harmful compound can become harmless when its elements are separated.
B. A harmless compound can become harmful when its elements are separated.
C. Breaking a compound into its separate elements has no noticeable effects.
D.Breaking a compound into its separate elements can create carbon dioxide.
Answers
Answer:
B
Explanation:
I am not sure why
Answer:
Yea I think B as well!!!!!
In Step 5, you will calculate H+/OH– ratios for more extreme pH solutions. Find the concentration of H+ ions to OH– ions listed in Table B of your Student Guide for a solution at a pH = 2. Then divide the H+ concentration by the OH– concentration. Record these concentrations and ratio in Table C. What is the concentration of H+ ions at a pH = 2? mol/L What is the concentration of OH– ions at a pH = 2? mol/L What is the ratio of H+ ions to OH– ions at a pH = 2? : 1
Answers
Answer:0.01
0.000000000001
10,000,000,000
Explanation:
Answer:
1. What is the concentration of H+ ions at a pH = 2?
0.01 mol/L
2. What is the concentration of OH– ions at a pH = 2?
0.000000000001 mol/L
3. What is the ratio of H+ ions to OH– ions at a pH = 2?
10,000,000,000 : 1
Have a wonderful day/night! :)
Explain why Chlorine has the largest electronegativity between Ne, Mg, Ba, Sb, Hg, Li?
Answers
Answer:
Look at the image provided and try work it out. I don't have the time but I hope I helped you!
Explanation:
The best description of the Big Bang Theory is ______________
A. The universe began with cold dense energy compressing into matter after which all matter and energy began rapidly contracting toward each other.
B. The universe began with hot dense energy compressing into matter after which all matter and energy began rapidly expanding away from each other.
C. The universe began with hot dense matter after which all energy began rapidly expanding away from each other.
D. The universe began with cold, spread out matter compressing into energy, after which all matter and energy began slowly moving toward each other
Answers
Answer:
B. the universe began with hot dense energy compressing into matter after which all matter and energy began to rapidly expanding away from each other.
hope it helps
Can someone balance these equations?
Answers
This is mind numbing, but I got you.
3NaOH + 1FeCl3 = 1Fe(OH)3 + 3NaCl
3Mg + 2H3(PO)4 = 1Mg(PO4)2 + 3H2
What force pulled the solar system together out of a cloud of gas and dust
Answers
Approximately 4.5 billion years ago, gravity pulled a cloud of dust and gas together to form our solar system.
properties changes if the size of an object changes?
A.mass
B.volume
C.weight
D.all of the above
Answers
Answer:
D
Explanation:
The answer should be D, when the size of an object changes it changes how much mass it has how heavy it is (weight), and how much space it takes up (volume).
27.2Pb(NO3)2 --> 2Pb0 + 4NO2 + O2
O A. Synthesis
B. Single displacement
C. Decomposition
D. Combustion
Answers
how can a substance stay at a certain temperature even though it is being heated?
Answers
Help please I need it!
Answers
how can acids cause chemical weathering
Answers
The acids react with the chemical composition of the rock causes the disintegration of the rocks.
Chemicals when react with the chemical components of the rocks cause the disintegration of the chemical and physical structure of rocks which cause breakage of rocks into parts. This process is called chemical weathering.
For example, the sulfur dioxide gas in the air reacts with the water in the air to form the acid rain.
The acid rain reacts with the chalk or limestone rock that causes the disintegration of the chemical structure and physical structure of rock causing breakage of the chalk or limestone.
Learn more about weathering:
https://brainly.com/question/14426457
Why does forming bonds release energy? *
Answers
how does activation energy influence a reaction
Answers
Answer: The activation energy of a particular reaction determines the rate at which it will proceed. The higher the activation energy, the slower the chemical reaction will be. The example of iron rusting illustrates an inherently slow reaction.
Explanation:
convert 100 ml to L can you help mee??
Answers
Answer:
0.1 L
Explanation:
divide the volume value by 1000
Answer:
0.1 L that is the answer
Explanation:
I searched it
Please help... giving a lot of points and awarding brainliest.
Answers
Percent Yield: 67.4%
Theoretical Yield of C2H6: 6.50
Percent Yield: 88.7%
Theoretical Yield of HF: 3.84
Percent Yield: 71.4%
Explain how to identify a starting position on a line.
Answers
Displacement is defined as the distance, in any direction, of an object relative to the position of another object. Physicists use the concept of a position vector as a graphical tool to visualize displacements. A position vector expresses the positionof an object from the origin of a coordinate system
Answer:
Pick a reference point on the line to be the zero position. Determine the direction and measure the distance from zero in standard units.
Explanation:
find the percent composition of lead in lead (II) nitrate. round to 2 significant figures.
Answers
Answer/Explanation:
62.559%
mass of an element X 100%
mass of the compound
Scientific Notation: 3.45 x 10^5
E Notation: 3.45e5
Assume that a 100-base pair DNA double helix contains 45 cytosine bases. Use logical thinking to figure out how many adenine bases there will be. Explain how you know.
Answers
Answer:
You will not be allowed to have any learning aids while taking a test or ... A DNA molecule consists of three parts—a nitrogen base, ... There are four DNA nucleotides, each with one of the four nitrogen bases (adenine, thymine, cytosine, and guanine). The DNA forms a two-stranded spiral, or double helix.
Explanation:
hope this helps ✌️
To Identify a mineral, there are tests that are used including:
Answers
Geologists use the following tests to distinguish minerals and the rocks they make: hardness, color, streak, luster, cleavage and chemical reaction.
How many molecules of nitrogen dioxide NO2 are in 1 mole of NO2?
Answers
Answer:
The answer is 46.0055. We assume you are converting between grams NO2 and mole. You can view more details on each measurement unit: molecular weight of NO2 or mol This compound is also known as Nitrogen Dioxide.
Explanation:
hope this helps
HELPPP simply the expression!!!!
Answers
Answer:
[tex] \frac{3}{ \sqrt{3} } \times \frac{ \sqrt{3} }{ \sqrt{3} } = \frac{3 \sqrt{3} }{3} = \sqrt{3} [/tex]
when there is a radical in the denominator, we should rationalize (mutiply the denominator and numerator by the radical) to get rid of the radical in the denominator.
35 points
What are the reactants and the products in this equation?
2H2 + O2 → 2H2O
a Reactants: water; Products: hydrogen, oxygen
b Reactants: hydrogen, oxygen; Products: water
Answers
Answer:
02 ;D h2oooooooooooo
long story shortB
Explanation:
Answer:
B
Explanation:
2H2→Hydrogen peroxide
O2→oxygen
"A water molecule (formally known as dihydrogen monoxide) is composed of two hydrogen atoms and one oxygen atom. ... The actual reaction to make water is a bit more complicated: 2H2 + O2 = 2H2O + Energy"
"A reactant is a substance that is present at the start of a chemical reaction. The substance(s) to the right of the arrow are called products . A product is a substance that is present at the end of a chemical reaction."
The answer is B, hope this helps :)