Sodium metal reacts with water to produce hydrogen gas according to the following equation:
2Na(s) + 2H2O(l)2NaOH(aq) + H2(g)
The product gas, H2, is collected over water at a temperature of 25 °C and a pressure of 759 mm Hg. If the wet H2 gas formed occupies a volume of 8.11 L, the number of grams of H2 formed is _______g. The vapor pressure of water is 23.8 mm Hg at 25 °C.
Answer:
0.648 g
Explanation:
Step 1: Write the balanced equation
2 Na(s) + 2 H₂O(l) ⇒ 2 NaOH(aq) + H₂(g)
Step 2: Calculate the partial pressure of H₂
The total pressure (P) is equal to the sum of the partial pressures of hydrogen and water vapor.
P = pH₂O + pH₂
pH₂ = P - pH₂O
pH₂ = 759 mmHg - 23.8 mmHg = 735 mmHg
Step 3: Convert "pH₂" to atm
We will use the conversion factor 1 atm = 760 mmHg.
735 mmHg × 1 atm/760 mmHg = 0.967 atm
Step 4: Convert "25°C" to K
We will use the following expression.
K = °C + 273.15 = 25°C + 273.15 = 298 K
Step 5: Calculate the moles of hydrogen (n) formed
We will use the ideal gas equation.
P × V = n × R × T
n = P × V/R × T
n = 0.967 atm × 8.11 L/(0.0821 atm.L/mol.K) × 298 K = 0.321 mol
Step 6: Calculate the mass corresponding to 0.321 moles of hydrogen
The molar mass of H₂ is 2.02 g/mol.
0.321 mol × 2.02 g/mol = 0.648 g
When sodium chloride and metallic sodium are
each dissolved in water A. both processes are
exothermic B. both processes are endothermic
C. the dissolution of metallic sodium is endothermic
D. the dissolution of metallic sodium is exothermic
E. the dissolution of sodium chloride is explosive
Answer:
B
Explanation:
don't try to do that at home
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Page 24 of 28
Question 24 (1 point)
To change 0.800 moles of liquid zinc to gaseous zinc, the amount of thermal energy required is
kj.
Ą Enter your three-digit answer.
Looking across period 4 of the periodic table, potassium (atomic number 19) is followed by calcium (atomic number 20), which is followed by scandium (atomic number 21). Which element should have the largest atomic radius?
Please help me right now ASAP
The chemical potassium sulfate, commonly known as potash of sulfur, is used in fertilizers. This chemical provides both potassium and sulfur to the soil and is easily soluble in water. Potassium sulfate is formed when a strong acid like sulfuric acid (H2SO4) reacts with a strong base like potassium hydroxide. Write the complete balanced molecular equation for this neutralization reaction.
Answer: [tex]H_2SO_4(aq)+2KOH(aq)\rightarrow K_2SO_4(aq)+2H_2O(l)[/tex]
Explanation:
Neutralization is a chemical reaction in which acid and base combine to form salt and water. Acids donate [tex]H^+[/tex] ions and bases donate [tex]OH^-[/tex] ions in water which combine to form water molecules.
The balanced molecular equation is ;
[tex]H_2SO_4(aq)+2KOH(aq)\rightarrow K_2SO_4(aq)+2H_2O(l)[/tex]
What properties makes it possible for substances to be separated using crystallisation
Glycerophospholipids (phosphoglycerides) are components of cell membranes.
a. True
b. False
Answer:
The correct answer is a. True
Explanation:
The main components of cell membranes are lipids and proteins. Lipids are responsible to form the structural barrier with the surroundings. The general structure of the membrane is made up of phospholipids, which have a part of the molecule with affinity to other lipids, and another part with affinity to water. The most common and abundant phospholipids are glycerophospholipids.
Therefore, the sentence is true.
Explain why this crossing could result in white hedgehogs even though brown is dominant
Answer:
Because The white gene is the recessive gene and the brown gene is the dominant gene hence all the offspring being brown instead of white :)
Explanation:
Thank me later!
g Imagine that you found a piece of carved wood that has been embedded in glacial ice. The mass of the wood is 50 grams, and 30% of the mass is carbon. The 14C/12C ratio of the wood was measured by mass spectrometry, and found to be 20 % of the 14C/12C ratio found in CO2 in modern air. You may assume that the half life of 14C is 5700 years. Which is the best estimate of the age of the wood
Answer:
13414 years
Explanation:
From;
0.693/ t1/2 = 2.303/t log No/N
t1/2 = half life of C-14
t = age of the sample
No= initial amount of C-14
N = present amount of C-14
From the question, N = 0.2 No
Hence;
0.693/5700 = 2.303/t log No/0.2No
1.2 * 10^-4 = 2.303/t log 1/0.2
1.2 * 10^-4 = 1.6097/t
t = 1.6097/1.2 * 10^-4
t = 13414 years
Part B
The electricity we use is generated from many different sources of energy. The five sources used most in the
United States are natural gas, coal, nuclear fuel
, hydropower, and wind. For each of these sources, describe the
original form of the energy and the way in which it's converted to electrical energy. Do Internet research, as
needed, to describe each energy source.
Question 1
Describe the energy in natural gas and the way in which it's converted to electrical energy. Write 50 to 100 words
Question 1:
The natural gas starts by piping natural gas underground to power plants, then the power plants burn the natural gas to boil water that becomes steam. The steam spins the blades of a turbine that is connected to a generator, then the generator spins the magnets which generate the electricity.
Part B:
Natural gas: The original form of natural gas is a fossil energy source. Natural gas plants use a gas turbine; natural gas is added, along with a stream of air, which combusts and expands through this turbine causing a generator to spin a magnet, making electricity.
Coal: The original form of coal is peat. Coal-fired plants produce electricity by burning coal in a boiler to produce steam. The steam produced, under tremendous pressure, flows into a turbine, which spins a generator to create electricity. The steam is then cooled, condensed back into the water, and returned to the boiler to restart the process.
Nuclear fuel: Sorry couldn't do this one, it's 4 am and my brain just isn't working w me too well.
Hydropower: The original form of hydropower is water. The hydropower plants water flows through a pipe, or penstock, then pushes against and turns blades in a turbine to spin a generator to produce electricity
Wind: Sorry couldn't do this one either.
I'm sorry I didn't do two of them but I really hope this helps.
Answer:
Nuclear Fuel is derived from the splitting of uranium atoms also known as fission. Uranium is mined and undergoes refining and enrichment and put through a nuclear reactor. Then it is put into fuel rods and grouped to form fuel assemblies. It is finally stored in the reactors core.
Wind gets is original energy from the sun. The sun heats the surface of the earth and the air above it warms and rises upwards into the atmosphere. Wind is used to power water pumps and was used to move boats along rivers.
Explanation:
In which of the following compounds does iron have the lowest oxidation number?
A. All are equal
B. Fe(OH)2
C. Fe(OH)3
D. FeOH
Answer:
C is the Answer
Follow me please
Mark brainliest
Compounds are formed by the same or the different molecules of the elements. Iron has the lowest oxidation number in FeOH. Thus, option D is correct.
What is the oxidation number?The oxidation number is the total gain or loss of the electrons by the atom to form a chemical bond with another atom in a molecule or a compound.
The oxidation state in a neutral compound adds up to zero. The oxidation number of oxygen is -2, and that of hydrogen a monoatomic ion is always +1.
Oxidation states are calculated as,
Fe(OH)₂:
X + 2 (-2 +1 ) = 0
X -2 = 0
X = +2
Fe(OH)₃:
X + 3 (-2 +1 ) = 0
X - 3 = 0
X = + 3
FeOH:
X -2 + 1 = 0
X - 1 = 0
X = +1
Therefore, iron has the lowest oxidation number in FeOH.
Learn more about oxidation numbers here:
https://brainly.com/question/3035498
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= 25 X 5 = (use the correct number of sig figs)
Answer:
125
Explanation:
Why might calcium also be called the calcium of citric acid
Calcium also be called the calcium of citric acid because calcium citrate malate contains the calcium salt of citric acid and malic acid.
What is citric acid?Citric acid is an organic compound with a chemical formula [tex]HOC(CO_2H)[/tex].
Calcium citrate malate is a water-soluble calcium supplement. It is the calcium salt of citric acid and malic acid with variable composition.
Hence, calcium is also called the calcium of citric acid.
Learn more about citric acid here:
https://brainly.com/question/11238674
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¿The presence of which atmospheric condition will most likely result in clear skies in Binghamton, New York?
Answer:
Most Likely A High Pressure Center
Explanation:
is most likely high pressure Center because on a weather map over the southern western Pennsylvania there's mostly high pressure over there. The descending air diverges and spreads out from the center and their is a Coriolis effect which causes the Diverging air to rotate in a clockwise direction.
True or false atoms are the smallest particle of an element that have that elements properties
Answer:false
Explanation:false
Answer:
true
Explanation:
hoping for the brainliest
Vicky made the following list to describe humidity:
It is the amount of water vapor in the air.
It is shown on weather maps in millimeters or in inches.
It can seen on cold surface as water droplets.
Which statement best describes why the list is incorrect?
A)It can be seen on hot surfaces as water droplets.
B) It is shown on weather maps as a percent.
C) It is the amount of moisture in the air.
D) It is the temperature of water in the clouds
Answer: c
Explanation : because it make sense the most (srry if im wrong!)
Answer: It is the amount of moisture in the air.
Explanation:
Food is taken in and broken down by the _______ system. The raw materials are then transported throughout the body by the _______ system.
A. nervous; skin
B. respiratory; circulatory
C. digestive; circulatory
D. digestive; skin
Answer:
C. digestive; circulatory
Explanation:
It is the correct answer..
Antacids are used to treat acid reflux by neutralizing stomach acid, which is hydrochloric acid. Calcium carbonate, sodium bicarbonate and aluminum hydroxide are common main ingredients found in various brands of antacids. The brand Tums has calcium carbonate as the main ingredient to neutralize stomach acid. Write a balanced equation to show how Tums will neutralize stomach acid, and answer the following questions based on this reaction.
Answer: [tex]CaCO_3+2HCl\rightarrow CaCl_2+H_2O+CO_2[/tex]
Explanation:
Neutralization is a chemical reaction in which acid and base combine to form salt and water. Acids donate[tex]H^+[/tex] and bases donate [tex]OH^-[/tex] in water which combine to form water molecules.
The chemical reaction between calcium carbonate and hydrochloric acid forms calcium chloride , water and carbon dioxide.
The balanced chemical equation is:
[tex]CaCO_3+2HCl\rightarrow CaCl_2+H_2O+CO_2[/tex]
If 20.0 g NaOH reacts with 30.0 g of H2SO4 how much Na2SO4 is produced?
Given: 2NaOH(aq) + H2SO4(aq) | Na2SO4(aq) + 2H2O(l)
Answer:
10g
Explanation:
find the limiting agent first
using mole ratio
2 moles of NAOH reacts with 2 moles of H2SO4
then 20g of NAOH require 20g of H2SO4
USING mole ratio on the limiting agent and product
2moles of NAOH produces 1 mole of NA2SO4
THEN
20g of NAOH will produce X
THEN solve for X
X =10g
Suppose that you are performing a titration on a monoprotic acid. Titration of this monoprotic acid required a volume of 0.1L of the base being used. If the same volume of a diprotic acid would instead have been used (same volume of a diprotic acid versus the originally used monoprotic acid), and if we assume furthermore that the concentration of the diprotic acid and the monoprotic acids are equal, how does the volume of base required to reach the endpoint for the diprotic acid compare to the volume of base required to reach the endpoint for the monoprotic acid?
A) More base is likely required to reach the endpoint for the diprotic acid than for the monoprotic acid under these conditionsB) Less base is likely required to reach the endpoint for the diprotic acid than for the monoprotic acid. C) Exactly the same amount of base is required for both monoprotic and diprotic acids under the situations described here.D) A completely different indicator will need to be used here.
Answer: A) More base is likely required to reach the endpoint for the diprotic acid than for the monoprotic acid under these conditions
Explanation:
The monoprotic acid (HA) has a valency of 1 and diprotic acid [tex](H_2A)[/tex] has a valency of 2.
As the concentration and volume of the diprotic acid and the monoprotic acids are equal.
The neutralization reaction for monoprotic acid is:
[tex]HA+BOH\rightarrow BA+H_2O[/tex]
The neutralization reaction for diprotic acid is:
[tex]H_2A+2BOH\rightarrow B_2A+2H_2O[/tex]
Thus more number of moles of base are required for neutralization of diprotic acid and thus the volume required will be more as concentration and volume of the diprotic acid and the monoprotic acids are equal.
Mixing hydrochloric acid (HCl) and aqueous calcium hydroxide produces water and aqueous Calcium Chloride. Write the complete and net ionic equations
Answer:
HCI+Ca(OH)2
Explanation:
Which item isn't a resource?
food
shelter
temperature
available mates
Answer:
temperature
Explanation:
hope this helps
WBCS are often called soldier of the body why
Answer:
White blood cells are cells of the system, which play a neighborhood in protecting the body against infectious diseases and foreign bodies. These cells flow with the blood throughout the body then scavenge and kill the parasites and foreign bodies. Hence, they are called soldiers of the body.
I hope it's helpful!
A woman is pregnant. Which of her body systems are involved in providing needed nutrients to her unborn child?
i need help with this please
Answer:
owa owa owa owa
Explanation:
owa owa owa owa owa owa owa
1. Your friend has a balloon that can hold a volume of 5 L. If she added a 3 mol of CO2 gas at a pressure of 0.90 atm, what is the temperature of the balloon?
Answer:
I don't understand your question
A vaccine used against an infectious disease may contain
Answer:
Vaccines include a variety of ingredients including antigens, stabilizers, adjuvants, antibiotics, and preservatives. They may also contain residual by-products from the production process.
Which statement is true?
Answer:
use research
Explanation:
Which event is an example of sexual reproduction in plants?
A. Pine trees produce seeds in cones.
B. Mosses form spores in capsules.
C. A kalanchoe produces plantlets on its leaves.
D. A potato has buds that can grow into new stems.
Answer:
the correct answer to your question is b