Answer:
-635 J or -.635 kJ
Explanation:
ΔHrxn= The change/difference in enthalpy between the products and reactants. Here the ΔHrxn tells us there is -902 kJ released per mole. So we can say we 4 mols of NH3 release -902 kJ. This can also be applied to the other compounds, where 5 mols of O2 release -902 kJ.
Keeping that in mind, we are looking for the heat released for 47.9g of NH3, let's convert grams > mols > kJ using the connection we made above.
1. We first need the molar mass of NH3 (17g) to convert to moles.
(47.9 g NH3) x [tex]\frac{1 mol NH3}{17g NH3}[/tex] x [tex]\frac{-902 kJ}{4 mol NH3}[/tex] = -635 J
2. If we need it in kJ, we can convert knowing that...
1000 J= 1 kJ
-635 J x [tex]\frac{1 kJ}{1000 J}[/tex]= -.635 kJ
weak orange juice is an example of
Answer:
Orange Juice itself is very acidic with a pH of 3. One main component which provides the vitamin C in the orange is citric acid. Citric Acid is a weak acid (C6H8O7), and weak acids are only partially ionized in solutions such as water.
Explanation:
HELP ME!!! Is it right? Or wrong
Your bond Line notation is missing a carbon.
Even when the temperature of a pan of water is less than the boiling point, water still evaporates. This is because
a. the speeds of individual molecules varies
b. conservation of energy
c. of convection
d. radiation
During a lunar eclipse on Earth what would an observer
on the Moon see?
Answer:
They would see the moon turn red.
Explanation:
Natural processes tend to increase the __________ of thermodynamic systems.
a. internal energy
b. temperature
c. entropy
d. Carnot efficiency
Answer:
the answer is c
Explanation:
What is a control?
a variable or variables that you must keep constant during an experiment
a variable or variables that you manipulate during an experiment
a variable or variables for which you cannot account
a variable or variables that change with the independent variable
Answer:
a is the answer
please mark it brainliest
Answer:
A control variable (or scientific constant) in scientific experimentation is an experimental element which is constant and unchanged throughout the course of the investigation.
Explanation:
NEED HELP ANSWERING THIS QUESTION
I-Ö-I I--I.
I-U-I •I-O-I.
I-Ö-I
B.
D.
Which is the correct Lewis structure for ethylene, C2H4?
.
I-0-I I-0-I
I.-O-I
II
E.
I-U-I
エーローエ
OA. A
OB. B
Ос. с
OD. D
A.
Answer:
I think the answer is A.
please give thanks if it helps
and sorry if it doesn't help.
I need help with this because it's easy for you guys but I don't understand it
Answer:
from nitrogen fixation in plants, lightning and bacteria
Explanation:
Use the drop-down menus to answer the questions.
What would be a reasonable value for the vapor pressure of 1-heptene at 100°C?
Answer:
800 mm Hg
Explanation:
I took the class
Answer:
Use the drop-down menus to answer the questions.
What would be a reasonable value for the vapor pressure of 1-heptene at 100°C?
✔ 800 mm Hg
All gases at the same temperature have the same kinetic energy; however, this does not necessarily mean the gas molecules move at the same speed. At 25°C, which gas will have move the slowest?
Kr (molar mass=83.80 g/mol)
He (molar mass = 4.00 g/mol)
Ne (molar mass = 20.18 g/mol)
Ar (molar mass= 39.95 g/mol)
Answer:
Kr (molar mass=83.80 g/mol)
Explanation:
as it is the heaviest i think
Si-4) AN= 14 AM= 28
e= n=
Answer:
have a good day
Explanation:
Answer meeeeeeeeeeee
calculate the relative molecular mass of Ma(HCO3)2
Answer:I believe you mean Mg(HCO3)2. Since I have never heard of the element MA. but if you are calculating using mg(HCO3)2 your molar mass/ molecular mass will be 146.3387
Explanation:
Plzzzzz help... What causes specific lines to appear in a line spectrum?
Answer:
Spectral lines are produced by transitions of electrons within atoms or ions. As the electrons move closer to or farther from the nucleus of an atom (or of an ion), energy in the form of light (or other radiation) is emitted or absorbed.…
Explanation:
Specific lines appear in a line spectrum because produced by transitions of electrons within atoms or ions.
What are spectral lines?Spectral lines are produced when the electrons undergoes transitions within atoms or ions. When the electrons move far or near to nucleus of any atom, radiation of particular wavelength is emitted or absorbed.
These emitted light is represented as they are moving from one state to the another.
Thus, specific lines appear in a line spectrum because produced by transitions of electrons within atoms or ions.
Learn more about spectral lines.
https://brainly.com/question/27494244
#SPJ2
The curved surface in the night sky on which stars appear to be fixed is called the
orbital path
celestial sphere
ecliptic plane
star chart
Answer:
Celestial Sphere
Explanation:
When you look at the night sky, the stars appear to be fixed to an apparently curved surface above the observer. This surface is called the celestial sphere.
plz brainiest, thx, hope this helped
2. Why is it difficult for us to go up in a mountain than go down?
A We are moving against gravity
B. We are pulled by the wind
C. We are moving towards gravity.
D. None of the above
Farth
help
Answer:
We are moving against gravity
Which of these are the starting materials for cellular respiration?
a. Carbon dioxide and water
b. oxygen and sugar
c. Water and sugar
d. Water and oxygen
Answer:
the material will be water and oxygen
How many miles of N are in 0.179g of N2O?
Answer:
8.14x10⁻³ moles of N
Explanation:
In order to solve this problem first we convert 0.179 grams of N₂O into moles, using its molar mass:
0.179 g ÷ 44 g/mol = 4.07x10⁻³ mol N₂OThen we convert N₂O moles into N moles, using the data given by the compound's formula (that there are two N moles per N₂O mol):
4.07x10⁻³ mol N₂O * [tex]\frac{2molN}{1molN_2O}[/tex] = 8.14x10⁻³ mol NWhat is the molarity of a solution made by dissolving 3.51 mol NaCl in water to make
2.03 L of solution?
Answer: 1.73M
Explanation:
Molarity= moles of solute/ total volume of solution
= 3.51 mol / 2.03 L
= 1.729 M
= 1.73 M
A gas has a volume of 10 L at 200 K and a pressure of 1.5 atm . What would the volume of the gas be at 300 K and 2atm of pressure ?
Answer:
hi
Explanation:
I'm just figuring this out what am I doing
Which best identifies the function of fruits?
a. Fruits contain seeds that will develop into new plants
b. Fruits save and protect seeds for fertilization
c. Fruits give the plant food.
d. Fruits transfer pollen
Explanation:
i am not sure but i think is C
What volume in milliliters of H20 you need during preparation of 100 milliliters of 14.00 M H2SO4 solution starting with bottle of 17.5 M H2SO4? (Round your answer to closest integer)
Answer:
20 mL
Explanation:
We can determine the required volume of the concentrated (17.5 M) H₂SO₄ solution by using the C₁V₁=C₂V₂ formula:
17.5 M * V₁ = 14.00 M* 100 mLV₁ = 80 mLAs out of the 100 mL of the final solution, 80 mL are from the concentrated H₂SO₄ solution, the remaining 20 mL are of water (H₂O).
Does respiratory happens in the lungs true or false?
Answer:
True
Explanation:
Answer:
True
Explanation:
the lungs is a part of respiratory system, so it is true; its main job is to remove Co2 from your body and bring in fresh air
Which of the following statements is true regarding soundwaves?
a. Soundwaves travel as longitudinal or transverse waves depending on the medium they’re traveling through.
b. Soundwaves travel as transverse waves only.
c. Soundwaves travel as longitudinal or transverse waves depending on the temperature of the medium.
d. Soundwaves travel as longitudinal waves only.
Answer: Soundwaves travel as longitudinal or transverse waves depending on the temperature of the medium.
Explanation: i think its C
Please help! Due today!
Answer:
five(5) of them
sorry if I'm wrong
When a crystal of sugar dissolves in water, what happens to the entropy?
a. the sugar’s entropy increases, and the total entropy of the universe decreases.
b. the sugar’s entropy increases, and the total entropy of the universe increases.
c. the sugar’s entropy decreases, and the total entropy of the universe increases.
d. the sugar’s entropy decreases, and the total entropy of the universe decreases.
Answer:
Since sugar spontaneously dissolves in water, the total entropy of water and sugar has to increase when sugar dissolves.
so.
b. the sugar’s entropy increases, and the total entropy of the universe increases
2 What is the correct sequence of steps for the preparation of a pure sample of copper(II) sulfate
crystals from copper(II)oxide and sulfuric acid?
A dissolving → crystallisation → evaporation - filtration
B dissolving → evaporation filtration → crystallisation
Cdissolving → filtration - crystallisation - evaporation
D dissolving + filtration → evaporation → crystallisation
Answer:
The correct answer is - B. dissolving → evaporation filtration → crystallisation
Explanation:
The method of the preparation of a pure sample of copper(II) sulfate from dilute sulfuric acid and copper II oxide is given as follows:
step 1. Adding dilute sulfuric acid into a beaker. Using bunsen burner heat the beaker.
step 2. Adding the copper (II) oxide into the beaker and give it a little time at a time to the warm dilute sulfuric acid and stir
step 3. Filtering the mixture into an evaporating vessel to remove the excess copper (II) oxide and water from the filtrate.
Step 4. leave the rest filtrate to crystallize.
Copper (II) Oxide {CuO (s)} + Dilute Sulfuric Acid {H2SO4 (aq)} → Copper (II) Sulphate {CuSO4 (s)} + Water {H2O}
The correct sequence of steps for the preparation of a pure sample of copper(II) sulfate crystals from copper(II) oxide and sulfuric acid is dissolving → evaporation filtration → crystallisation.
Which form is the purest?Purest form of any substance is the crystalline form, if we get the compound in the crystalline form from any extraction then we get a pure sample.
Crystals of copper(II) sulfate, will get from copper(II) oxide and sulfuric acid through following steps:
First we put sulfuric acid in a beaker and then we warm in water bath.Then we add some powder of copper(II) oxide to the beaker, and will continue this adding till it is in excess.Then we filter the mixture and pour the filtrate of copper(II) sulfate into an evaporating basin and heat the solution evaporate half of the water.Then we pour the above solution into an evaporating basin & leave to allow all water to evaporate, and finally get the crystals of copper(II) sulfate.Hence, option (B) is correct.
To know more about crystallisation, visit the below link:
https://brainly.com/question/4795632
Does a radio have electrical and mechanical energy
Answer:
Electrical
Explanation:
18.0 g of carbon produces 55.0 g of carbon dioxide. What is the theoretical yield of CO2?
Answer:
Theoretical yield of CO₂ is 66 g
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated:
C + O₂ —> CO₂
Next, we shall determine the mass of C that reacted and the mass of CO₂ produced from the balanced equation. This can be obtained as follow:
Molar mass of C = 12 g/mol
Mass of C from the balanced equation = 1 × 12 = 12 g
Molar mass of CO₂ = 12 + (16×2)
= 12 +32
= 44 g/mol
Mass of CO₂ from the balanced equation = 1 × 44 = 44 g
SUMMARY:
From the balanced equation above,
12 g of C reacted to produce 44 g of CO₂.
Finally, we shall determine the theoretical yield of CO₂. This can be obtained as follow:
From the balanced equation above,
12 g of C reacted to produce 44 g of CO₂.
Therefore, 18 g of C will react to produce = (18 × 44)/12 = 66 g of CO₂.
Thus, the theoretical yield of CO₂ is 66 g.
Answer:
66 grams
Explanation:
Take a look at the following chemical equation. Complete the following: balance the equation, explain how the conversation of matter supports your answer, and identify the type of reaction.
Answer:
2 NaOH + H₂SO₄ ⇒ Na₂SO₄ + H₂O
We can see that Lavoisier's law of conservation of matter is obeyed because we have the same type and amount of elements on both sides of the equation.
Neutralization reaction.
Explanation:
Let's consider the following unbalanced equation. This is a neutralization reaction.
NaOH + H₂SO₄ ⇒ Na₂SO₄ + H₂O
First, we will balance Na atoms by multiplying NaOH by 2.
2 NaOH + H₂SO₄ ⇒ Na₂SO₄ + H₂O
Then, we get the balanced equation by multiplying H₂O by 2.
2 NaOH + H₂SO₄ ⇒ Na₂SO₄ + H₂O
We can see that Lavoisier's law of conservation of matter is obeyed because we have the same type and amount of elements on both sides of the equation.