Explanation:
150 grams is .15 liters
1 mole of gas at STP occupies 22.414 liters
.15 liter of hydrogen represents .15/22.414 =
0.0066922 moles of H2
equation is
Zn + 2HCl → ZnCl2 + H2
1 mole of Zn will make 1 mole of H2
0.0066922 moles of Zn will make 0.0066922 moles of H2
To convert this molar quantity of zinc into grams we simply multiply by the atomic mass of zinc, which is
65.38 g/mol;-
Mass of Zn required = 0.0066922 moles * 65.38 g/mol = 0.4375390381 grams
https://www.quora.com/How-many-grams-of-Zinc-would-you-need-to-react-with-Hydrochloric-acid-to-produce-1-L-of-H2-gas
What clues indicate that a chemical reaction has occurred?
Choose all correct answers.
the formation of a new liquid
a color change
a temperature change
the formation of bubbles
Answer:
its probably all of the above, if not then it should be the formation of a new liquid, and a color change
Explanation:
How many oxygen atoms are in one mole of carbon dioxide
Answer:
abt 2 moles
Explanation:
1 mole of carbon atoms per mole of carbon dioxide = 6.02 x 1023 carbon atoms. 2 mole of oxygen atoms per mole of oxygen atoms = 2 x 6.02 x 1023 oxygen atoms.
how many grams of KNO3 can be dissolved in 100g of water at 80c
Answer:
As temperature increases, its solubility increases as well. Notice, however, that it does not increase significantly. In fact, you can expect to be able to dissolve no more than 40 g of sodium chloride per 100 g of water at 80∘C
Explanation:
As temperature increases, its solubility increases as well. Notice, however, that it does not increase significantly. In fact, you can expect to be able to dissolve no more than 40 g of sodium chloride per 100 g of water at 80∘C
[Then mother noticed that two children who are watching the game are sick and coughing.She told her son to keep distance from those children to avoid getting sick]
1.Observe illustration no.1 and read the caption.Why did the mother ask her son to avoid the kid with cough?
2.Observe illustration no.2 and read the caption.Why did the mother let her son play with the kid with asthma?
please don't report this
Answer:
in illustration 1
the mother told her son not to play with the boy having cough because it is a transferable disease which could cause him also to get sick and would get cough.
while in
illustration 2
the mother let the boy play with the boy having asthma because it is not a transferable disease which wold not affect him or any one else.
Explanation:
this is the reason
#1
Cough is a infectious disease .It spreads through the droplets falling outwards during coughing.If her son stays there for long time he would be affected by cough also or he would get sick .So the mother denied .#2
Asthama is although a disease of lungs but it doesn't spread through air or droplets.It's not infectious .So nothing would happen if her child playsA telescope would be MOST useful in answering which question? . O How do rockets move in space? What shape is a human skin cell? O What is on the surface of the Moon? O How do worms breathe underground?
Answer:
what is on the surface of the moon.
Explanation:
The lewis electron dot system represents electrons in the--
a) outer energy level
b) inner level
c) core level
d) middle level
Answer:
the correct answer is a. the lewis structure represents only the outer energy level
why might it be unwise to drink water straight from a pond
Answer:
it is because of the bacteria and different things that go into waters such as ponds, rivers, lakes, seas, oceans, streams, and other body of waters and I should also add the chemicals that go into them as well
Explanation:
Sodium-24 has a half-life of 15 hours. How much sodium-24 will remain in a 36.0-g sample after 45 hours
Answer:
4.5 gm left
Explanation:
45 /15 = 3 half lives (1/2 )^3 =1/8 th
1/8 * 36 = 4.5 gm
How many kilojoules of heat are produced when 34.0 g of Fe2O3 reacts with an excess of CO according to the following reaction? Fe2O3 + 3 CO 2 Fe + 3 CO2 ΔH = -26.3 kJ
The heat produced when iron oxide reacts with carbon monoxide is -23.47 kJ/mol.
What is the enthalpy of reaction?
The standard enthalpy of the reaction is given by the enthalpy of formation of the products and the reactants. The reactants and the products of the reaction are:
Fe₂O₃ (s) + 3CO (g) → 2Fe(s) + 3CO₂ (g)
We know,
The standard enthalpy of formation of iron oxide = −825.50 kJ/mol
The standard enthalpy of formation of carbon monoxide = −110.53 kJ/mol
The standard enthalpy of formation of carbon dioxide = −393.52 kJ/mol
The standard enthalpy of reaction is calculated as:
[tex]\rm \Delta H_{rxn}[/tex] = [2(0) + 3(−393.52)] - [1(-825.50) + 3(-110.53)]
= (0−1180.56+825.50+331.59)
= −23.47 kJ/mol
Therefore, −23.47 kJ/mol is produced.
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WILL GIVE BRAINLIEST
If an element is in period 6, what is the highest possible number of electrons that can be in that atom?
I need this now for a test
explain why the dust clouds that moved to the east coast of the united states during the 1934 storm were composed mostly of silt and clay particles
instead of sand
Dust clouds that moved to the east coast of the united states were composed mostly of silt and clay particles due to constant ploughing during drought.
What is Drought?This is defined as dry period in the climate due to insufficient rainfall in the area at a given time.
The drought led to the soil being constantly ploughed thereby loosening and changing the soil type which is susceptible to wind erosion.
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describe what happens when water vapour cools to liquid water(change in arrangement,change in movement,change in energy)
Answer:
CONDENSATION When steam is cooled, it releases thermal energy and turns into its liquid state. This process is called condensation.
Explanation:
formation of water: 2H2 + 1 O2 --> 2H20
How many moles of O2 will I need to produce 15 moles of H2O?
Answer don’t delete comment or I’ll report
Answer:
n=15 moles H2O
1:2
x:15
x=7.5 moles of O2
PLEASE HELP DUE IN 10 MINUTES In your own words, how does photosynthesis work?
Answer:
During photosynthesis, plants take in carbon dioxide (CO2) and water (H2O) from the air and soil
Protons and neutrons are made from which of the following particles?
Down quarks only
Hadrons
Up quarks and down quarks
Up quarks only
If the molar mass of aluminum chloride was actually 400 g/mol, what would the molecular formula of aluminum chloride be?
Answer:
3AlCl₃
Explanation:
molar mass of aluminum chloride AlCl₃ is 133.33 g/mole
133.33 times 3 is 400
put 3 in front of AlCl₃
3AlCl₃
https://study.com/academy/lesson/aluminum-chloride-formula-molar-mass-decomposition.htm
how many grams of sodium Phosphate is needed to prepare 5.0 L of a 2.6M solution ?
Molarity is the ratio of the moles and the volume. The mass of 2.6 M sodium phosphate solution is 2131.22 gms.
What is mass?
Mass is the product of the moles and the molar mass of the substance. It is given as,
Mass = Moles × Molar mass
The moles from molar concentration is used to calculate mass as:
Mass = Molarity × volume × molar mass
= 2.6 × 5.0 × 163.94
= 2131.22 gms
Therefore, 2131.22 gms is the mass of sodium phosphate.
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What property of copper makes it ideal to create thin sheets of
copper?
Copper is a soft, ductile, and malleable metal that bends and stretches easily without breaking. Copper is a versatile metal for construction and manufacturing because of this.
What is the poh in a solution if the [oh-] = 5.42 x 10-5 m?
a
5.26
b
7.26
c
4.26
d
6.26
Answer:
b
Explanation:
is the dictionary definition of a word.
is the feeling or idea associated with a word.
Name these compounds according to IUPAC. (ASAPP)
Propanal and acetone are the IUPAC names for the chemical.
What is the difference between propanal and acetones?Propanal, commonly known as propanaldehyde, is an aldehyde with one double bond and one oxygen atom.
Acetone is a ketone compound. R2CO is the functional group of ketones.
Thus, Propanal and acetone are the IUPAC names for the chemical.
Learn more about propanal and acetones
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which term best defines the feeding behavior of most gulls?
Answer:
Gulls, or colloquially seagulls, are seabirds of the family Laridae in the suborder Lari. They are most closely related to the terns and skimmers and only distantly related to auks, and even more distantly to waders. Until the 21st century, most gulls were placed in the genus
Calculate the number of joules released when 75.0 grams of water are cooled from
100.0°C to 27.5°C
Answer:
-22750.5J or -2.28× 10⁴J
Explanation:
q=(75.0g)(4.184J)(27.5°C-100.0°C)
q= -22750.5J
q= -2.28× 10⁴J
A nuclide of phosphorus 3015P decays into a nuclide of silicon 3014Si. In order to satisfy charge conservation and lepton number conservation the other products must be __________.
In order to satisfy charge conservation and lepton number conservation the other products must be neutron.
What is conservation of mass?
The principle of conservation of mass states that, the sum of the initial mass of reactants must be equal to final mass of the products.
[tex]_{15}^{30}P\ --- > \ _{14}^{30} Si \ + \ ^{0}_{1} n[/tex]
The balanced reaction of radioactive decay of phosphorous shows conservation of mass.
Thus, in order to satisfy charge conservation and lepton number conservation the other products must be neutron.
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Which of the following equation is balanced?
Answer:
2fe2o3+3c=4fe+3co2
Explanation:
because 2×2 =4 fe &2×3=6 so we put it like 3co2
What is the color of bromocresol green indicator in a solution with a ph value of 2. 0.
Answer:
The answer would be "Yellow"
Explanation:
Hope this helps!
d. What is being done to save this species
e. An organization/group that is working towards
Create a commercial that showcases why we should save the manta rays
a. Commercials should be about 30seconds-1 minute. No longer than 30
Answer:
answer
Explanation:
I think it's e hope it right
(Help!) What is the mass of hydrogen atoms that is measured at 72 u?
Answer:
=71.439911 u
Explanation:
We know that 1 mass of hydrogen atom = 1.00784 u
If it's measured at 72u: 72/1.00784=71.439911 u
Mass of 1 mol hydrogen atoms =1.00784u
Total mass in 72u
72/1.0078471.43uYou and your classmates are working to develop a prototype for a new type of drone. The drone needs to fly and will be controlled by a remote control. Which STEM fields would be most important for you to have knowledge of to build this drone?
A) chemistry and botany
B) astronomy and geology
C) medicine and geology
D) physics and computer science
A semiconductor:
A.
always allows charge to flow.
B.
never allows charge to flow.
C.
cannot be used at normal temperatures.
D.
has characteristics between conductors and insulators.
Answer:
D. has characteristics between conductor and insulator
Why is copper a pure substance? a. because it is an element b. because it is a compund c. because it is a homogenous mixture
Answer:
a. because it is an element
Explanation:
its pure because it only has one type of atom, making it an element