The required elemental gas which has a mass of 10.3 g in the given conditions is helium gas.
How do we calculate molar mass?Relation between the molar mass and moles of any substance will be represented as:
n = W/M, where
W = given massM = molar massMoles of gas will be calculated by using the ideal gas equation:
PV = nRT, where
P = pressure = 758 torrV = volume = 58.4Ln = moles = ?R = universal gas constant = 62.363 L.torr / K.molT = temperature = 25 degree C = 298KOn putting all values, we get moles
n = (758)(58.4) / (62.363)(298) = 44,267.2 / 18,584.2
n = 2.38 moles
Molar mass of the gas will be calculated by using the above first equation is:
M = 10.3g / 2.38mol = 4.32 g/mol = 4g/mol (approx)
Hence given elemental gas is helium.
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72.
How many atoms are present in one mole of
water?
A)54
B)3
C)3(6.02 × 1023)
D)6.02 x 1023
Answer:
3 atoms
Explanation:
A water molecule consists of three atoms an oxygen atom and two hydrogen atoms which are bond together like little magnets
9. The use of lubricants makes the surface
(a) Rough
(b)Smooth
(c)Very Rough
(d)None of the above
Answer:
B
Explanation:
Which animal is in higher trophic level dolphins or plankton
Your best friend has passed on.write a tribute to him /her stating that person's characters and his/ her contribution to the society.
Answer:
a person with full of dignity and my best friend is now no more with me .
Can some please help me complete this for me it’s due today!
How many moles are in 1.5x1023 molecules of Na2SO4?
In the important industrial process for producing ammonia (the Haber Process), the overall reaction is:
N2(g) + 3H2(g) → 2NH3(g) + 100.4 kJ
A yield of NH3 of approximately 98% can be obtained at 200°C and 1,000 atmospheres of pressure.
This reaction is:
endothermic or exothermic? (please answer) thanks for any help:) it mean a lot
Answer:
The reaction is exothermic.
you are working as an analytical ghemist at a university. an archeologist is studying a village
dating to 800 to 1000 years ago brings you a sample of charcoal from a dig site 300 meters from
the main village site. the archeologist asks you to analyze the sample to see if it could be from a
new part of the village or was it naturally occurring. what is the scientific question the
archeologist is asking of you?
The scientific question that is being asked by the archeologist is the age of the sample.
What is a scientific question?A scientific question is a question that can be answered empirically. That is, the question can be answered through an experiment.
Given the explanation in the question, the scientific question that is being asked by the archeologist is the age of the sample.
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Which of the following radiactive elements was often put in beauty products?
Francium
Curium
Radium
Uranium
Answer:
Radium
Explanation:
Radium is a radioactive element which was often put in beauty products.
ANSWER ASAP!!!! PLS HELP
Answer: increase
Explanation: as pressure is increased, equlilibrium shifts towards the side with less moles of gas.
what are chemical changes in chemistry
a usually irreversible chemical reaction involving the rearrangement of the atoms of one or more substances and a change in their chemical properties or composition, resulting in the formation of at least one new substance: The formation of rust on iron is a chemical change. Chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. These processes are called chemical reactions and, in general, are not reversible except by further chemical reactions.
please help The sun uses nuclear fusion to generate its energy. In the very distant future, the sun will eventually run out of fuel.
A. All the hydrogen and smaller elements will eventually will fuse into larger elements until fusion is longer possible
B. the sun will stop burning once all the atoms have spilt
Answer:
A
Explanation:
the answer is a because the sun cannot stop burning but will rather burn hotter Then decay amongst the atoms in space
Can the law of conservation of mass be applied when cooking? In one to two sentences, explain why or why not. Please give an example without water.
The law of conservation of mass is must be applied when cooking.
What is conservation of mass?Law of conservation of mass states that mass of any substance will change into another form without any loss of mass, means destroying of mass is impossible.
When we cook food then mass of conservation is applied there, for example we are boiling pulses with water then in that case the amount of formed liquid pulses is equal to the initial mass of solid pulse with water.
Hence law of conservation of mass is applicable during cooking.
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What type of molecule is pentanal?
o a. ester
b. alcohol
o c. ketone
o d. aldehyde
i will mark brainliest!!!!
5. Which describes why the sun is a renewable resource?
a. The sun does not cause pollution.
b. The sun creates biomass.
c. The sun is continuously releasing energy.
Which of the following is not a molecular formula?
N₂020
N₂08
N₂04
NO₂
Answer:
N2020
Explanation:
I’m not fully sure but I’m pretty sure it’s wrong
How many protons does Pb4+ have
Answer:
82
Explanation:
the 4+ does not change the number of protons...it changes the number of ELECTRONS....
from a periodic table of elements the number of protons = 82
which lunar phase will occur about four days after a waxing crescent?
A. waning crescent
B.first quarter
C.full moon
D.waning gibbous
Answer:3.5 days is awfully precise and waxing gibbous is awfully vague.Let’s just make sure we understand our terminology. Waxing means getting fatter and gibbous means fat. A waxing gibbous moon lasts for approximately 7 days from the first quarter phase right up to the full moon phase.By 3.5 days I’m assuming you mean half a week and simplifying the lunar phases to 28 days exactly.So we have:Day 0 New moon.Day 7 First quarter.Day 14 Full moon.Day 21 Third quarter.Day 28 New Moon.Between day 0 - 7 we have the waxing crescent phase.Between day 7–14 we have the waxing gibbous phase.Between day 14–21 we have the waning gibbous phase.Between day 21–28 we have the waning crescent phase.So 3.5 days from day 7 would take us to day 10.5 which would still leave us in the waxing gibbous phase. 3.5 days after day 10.5 would take us to the full moon or over into the waning gibbous phase since the full moon lasts only an instant.
Explanation:
Waning gibbous is the lunar phase which will occur about four days after a waxing crescent. Therefore, the correct option is option D.
What is lunar phase?The lunar phase and Moon phase is indeed the shape of the directly illuminated section of the Moon, which may be described quantitatively using areas and angles. The lunar month is typically 29.53 days as seen from Earth.
The four major phases (new moon, first quarter, full moon, and last quarter) and four minor phases are qualitatively described. The orbital locations of the Moon round Earth and Earth from around Sun fluctuate throughout the course of a synodic month (about 29.53 days), which causes a gradual change in the lunar phases. Waning gibbous is the lunar phase which will occur about four days after a waxing crescent.
Therefore, the correct option is option D.
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give maximum 3 examples each for exothermic and endothermic reaction.
like :- N2+O2---->2NO
Explanation:
Exothermic reactions are those reactions in which heat is released.
Reactants→products+heat
For example, formation of ammonia from nitrogen and hydrogen is an exothermic reaction.
N2(g)+3H2(g)→2NH3(g)+92.2kJ
Endothermic reactions are those reactions in which heat is absorbed.
Reactants+heat→products
For example, dissociation of ammonia into nitrogen and hydrogen is an endothermic reaction.
2NH3 (g)+92.2kJ→
N2(g)+3H2(g)
Explain why hydrogen chloride is a gas at room temperature
The hydrogen chloride is a gas at room temperature due to the presence of weak intermolecular forces.
What is hydrogen chloride?Hydrogen chloride (HCl) is a chemical compound in which polar covalent bond is present between hydrogen atom and chlorine atom.
This bond is not so strong enough to maintain the stability in the liquid phase, else they are weak intermolecular forces and easily gets break through small amount of energy and having low boiling point. That's why HCl is present in gaseous state at room temperature.
Hence due to weak intermolecular force, HCl is present in gaseous state.
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a hydrochloric acid solution HCI has a concentration of 12.1 M. A 41.2 mL sample is used to make a more dilute solution. If the new solution has a concentration of 0.5 M determine the volume of the solution
If the new solution has a concentration of 0.5 M, then the volume of the solution is 997mL.
How do we calculate the required volume?Required volume of the new solution will be calculated by using the below equation as:
M₁V₁ = M₂V₂, where
M₁ & V₁ are the molarity and volume of initial HCl solution.
M₂ & V₂ are the molarity and volume of final HCl solution.
On putting values from the question, to the above question we get:
V₂ = (12.1)(41.2) / (0.5) = 997 mL
Hence resultant volume of the final solution is 997 mL.
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What is the hydronium ion concetration of a ph=9. 2 solution
The hydronium ion concentration of a pH = 9.2 of solution is 6.3 × 10⁻¹⁰M.
How do we calculate pH?pH of the solution is define as the negative logarithm of the concentration of the hydronium ion as:
pH = -log[H⁺]
Or [H⁺] = [tex]10^{-pH}[/tex]
Given that pH value = 9.2
On putting values, we get
[H⁺] = [tex]10^{-9.2}[/tex] = 6.3 × 10⁻¹⁰M
Hence required concentration of hydronium ion is 6.3 × 10⁻¹⁰M.
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Which element could be included in a hydrocarbon?
Ca
Zn
Cl
Sn
Answer:
Cl
Explanation:
Hydrocarbons are Carbon chains that contain at least one halogen (F, Cl, Br, I and At)
Cl is a halogen
(I got this right on the test too)
What does a positive value of A Gº mean for a reaction?
O A. The reaction is spontaneous if AS<0.
O
B. The reaction is spontaneous.
C. The reaction is spontaneous if A S> 0.
D. The reaction is nonspontaneous.
Answer:
D
Explanation:
If delta G at standard conditions is positive, then the reaction will always be nonspontaneous in the forward direction.
Explain how energy causes changes to earths surface
Answer:
Explanation:
The absorbed sunlight drives photosynthesis, fuels evaporation, melts snow and ice, and warms the Earth system. Solar power drives Earth's climate. Energy from the Sun heats the surface, warms the atmosphere, and powers the ocean currents.
Do tanning beds have nuclear fission or fusion?
Answer:
Neither? If it must be one then fission.
Explanation:
I actually didn't know they had fission, but I can absolutely gaurantee that they don't use fusion, nuclear fusion is a process that fuses hydrogen atoms together and releases a massive amount of energy, it used in hydrogen bombs and by our sun. It's a process that needs a massive amount of energy to kickstart and there's no way that technology would fit in a tanning bed. If I'm wrong then please tell me.
Hope this is a good answer.
Which element is reduced in this reaction? 2kmno4 3na2so3 h2o→2mno2 3na2so4 2koh
In a redox chemical reaction, one species gets reduced and another gets oxidized. Manganese element is reduced in this reaction.
What is oxidized and reduced?In a redox reaction, the increase or decrease in the oxidation number and electrons results in the reduction and oxidation of the chemical species. The oxidation and reduction occur simultaneously in a reaction.
The oxidation number of Mn in permanganate ion was +8 on the left side and decreased to +4 on the right side of the equation. Potassium permanganate is an oxidizing agent that has reduced the manganese ion of the permanganate ion.
Therefore, manganese is reduced.
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Convert 1060 mm Hg to atm. (answer should include 3 sig. fig and NO LABEL)
Answer:
1.39
Explanation:
1060 mm / 760 mm/atm = 1.39 atm
Iron(111)Carbonate +cesium > cesium carbonate +iron balced
Balanced chemical equation for the given reaction is Fe₂(CO₃)₃ + 6Cs → 3Cs₂CO₃ + 2Fe.
What is balanced equation?Balanced chemical equations are those equations in which all entities are present in equal amount on reactant side as well as on product side.
Given balanced chemical reaction is:
Fe₂(CO₃)₃ + 6Cs → 3Cs₂CO₃ + 2Fe
Above given equation is a balanced chemical equation where all atoms of reactant as well as of products are present in same amount.
Hence, required balanced equation is Fe₂(CO₃)₃ + 6Cs → 3Cs₂CO₃ + 2Fe.
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?? Answeeeeeeer
Answerrrrrrrrr
Answer:
.00000005 C or 50 x 10^-9 C
Explanation:
Like charges REPEL
k = 8.99 x 10^9 kg m^3 / s^2 C^2 ( they should have given units of this)
F = k q1q2/r^2 q1 = q2 so
F = k q^2 / r^2
9 x 10^-3 = 8.99 x 10^9 * q^2 /.05^2 (.05 m = 5cm)
q = .00000005 C
