Answer:
28.93 g/mol
Explanation:
This is an extension of Graham's Law of Effusion where [tex]\frac{R1}{R2} = \sqrt{\frac{M2}{M1} } = \frac{t2}{t1}[/tex]
We're only talking about molar mass and time (t) here so we'll just concentrate on [tex]\sqrt{\frac{M2}{M1} } = \frac{t2}{t1}[/tex]. Notice how the molar mass and time are on the same position, recall effusion is when gas escapes from a container through a small hole. The time it takes it to leave depends on the molar mass. If the gas is heavy, like Xe, it would take a longer time (4.83 minutes). If it was light it would leave in less time, that gives us somewhat an idea what our element could be, we know that it's atleast an element before Xenon.
Let's plug everything in and solve for M2. I chose M2 to be the unknown here because it's easier to have it basically as a whole number already.
[tex]\sqrt{\frac{M2}{131} } = \frac{2.29}{4.83}[/tex]
The square root is easier to deal with if you take it out in the first step, so let's remove it by squaring each side by 2, the opposite of square root essentially.
[tex](\sqrt{\frac{M2}{131} } )^2= (\frac{2.29}{4.83})^2[/tex]
[tex]{\frac{M2}{131} } = (0.47)^2[/tex]
[tex]{\frac{M2}{131} } = 0.22[/tex]
M2= 0.22 x 131
M2= 28.93 g/mol
can a combustion reaction have CO2 and H2O as reactants?
the answer to this question is yes
Answer:
68755566
Explanation:elona ouna SEI NOA GOSSTA MAI EPA NOI GESTA
What is the molar solubility of lead phosphate in water in moles?
Please help?!
Answer:
Now, the molar solubility of lead(II) phosphate in water is said to be equal to 6.2⋅10−12mol L−1 . This means that in one liter of water, presumably at room temperature, you can only hope to dissolve 6.2⋅10−12 moles of lead(II) phosphate.
Explanation:
Hope this helps!!
2. A destructive, rotating column of air that has very high wind speeds and that is sometimes visible
as a funnel-shaped cloud is a un
(6 Points)
hurricane
Ο Ο Ο
tornado
O thunderstorm
Answer:
Tornado
Explanation:
Can any one plz solve and send this question who ever solve this right I will make you brainliest this is physic
Answer: Energy = 10000J - 2000J = 8000J
Therefore, the energy is dissipated the skier moves down to the slope is 8000J
Explanation:
What is the molecular geometry of carbon tetrachloride (CC1,)?
O linear
O trigonal planar
O tetrahedral
O trigonal pyramidal
Answer:
tetrahedral
As carbon has no 4 valence electrons that are occupied by 4 chlorine atoms, we get 0 lone pair in carbon and sp3 hybridisation which leads to tetrahedral shape.
write four facts of cross breeding plants
Answer:
Plant breeding
Plant breeding is the science of changing the traits of plants in order to produce desired characteristics. It has been used to improve the quality of nutrition in products for humans and animals.
Explanation:
what is the compound name for (NH4)2SO4
Answer:
Diazanium sulfate is the correct answer.
Explanation:
Hope this helped Mark BRAINLIEST!!
Calculate mass (in grams) of sodium in 8.5 g of NaCl (table salt).
Answer: I go search some information
Explanation:I come back with a answer
What is the function of the pistil and stamen of a plant?
To allow the plant to reproduce.
They provide support for the plant.
They protect the plant from the weather.
The protect the plant from predators.
Answer:
the answer is A
Explanation:
Hopefully u get the answer right
Answer:
A
Explanation:
give me thanks not stars
What does a chemical reaction rate measure?
Answer:
it measures how much reactant is consumed and how much product is made
what is chemical reaction
Chemical reaction, a process in which one or more substances, the reactants, are converted to one or more different substances, the products. Substances are either chemical elements or compounds. A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products.
calculate the number of moles present in 9.50g of CO2
Answer: 44.0095.
Explanation:
Which type of hybridization is observed when central atom is located at the centre of regular tetrahedron
Answer:
sp3 hybridization
Explanation:
Hybridization means the mixing of atomic orbitals to yield hybrid orbitals with characteristics that are different from that of the isolated atomic orbitals before the combination.
sp3 hybridization occurs when one s orbital is mixed with three p orbitals to yield four sp3 hybrid orbitals which can be used to bond to a central atom.
The central atom is then located at the center of a regular tetrahedron at a bond angle of 109°.
The empirical formula for butene is
A.
CH2
B.
C₂H4
C.
Ca HG
D
C4H8
Which statement describes the feeling interactions between frogs and insects? Select all that apply.
A. The frog is a predator
B. The interactions is mutualistic
C. The frog is a parasite
D. The number of insects can influence the number of frogs in the ecosystem.
How many moles of iron would be needed to react with 3.82 moles of
oxygen
The number of moles of iron (Fe) required to react with 3.82 moles of oxygen is 5.09 moles
Balanced equation
3O₂ + 4Fe —> 2Fe₂O₃
From the balanced equation above,
3 moles of O₂ reacted with 4 moles of Fe
How to determine the moles of FeFrom the balanced equation above,
3 moles of O₂ reacted with 4 moles of Fe
Therefore,
3.82 moles of O₂ will react with = (3.82 × 4) / 3 = 5.09 moles of Fe
Thus, 5.09 moles of Fe is needed for the reaction
Learn more about stoichiometry:
https://brainly.com/question/14735801
Rod cells work best in dim light and enable you to see black, white, and shades of gray.
true
or
not
Described the test for carbon dioxide. Give the result of the test.
Why does the United kingdom have a temperate climate instead of a polar climate
Answer:
https://www.bbc.co.uk/bitesize/guides/zpykxsg/revision/3 (i know ppl hate it when you put links but i actually think this may explain it)
Explanation:
How many moles of O2 are needed to produce 8.33 moles of H2SO4?
Which of the following represents a double-displacement reaction?
a. ABC ➡️AB +C
b. A+B ➡️AB
c. AB + CD➡️AD + CB
d. A + BC ➡️AC + B
DNA evidence can be used for what? Creating a representation of a suspect Identifying a species of pollen Matching microbiomes All of the above
Answer:
multiple things.
Explanation:
DNA evidence collected from a crime scene can be linked to a suspect or can eliminate a suspect from suspicion. During a sexual assault, for example, biological evidence such as hair, skin cells, semen, or blood can be left on the victim's body or other parts of the crime scene.
Answer:
I think it is just a
Explanation:
How does Sodium turns into another element? By the Nuclear Fusion?
Answer:If an atom loses or gains a proton, it becomes a new element. For example, if a sodium atom loses a proton, it would become a negative ion of neon. ... In nuclear reactions, like nuclear fusion, the electrons play minor roles and it is the nucleons that interact to create new elements
Explanation:
Answer:
If an atom loses or gains a proton, it becomes a new element. For example, if a sodium atom loses a proton, it would become a negative ion of neon. ... In nuclear reactions, like nuclear fusion, the electrons play minor roles and it is the nucleons that interact to create new elements.
Explanation:
hope this helps!
What is the poH of a solution that has an [H+] = 7.7 x 10-7 M? *
O 7.9
6.5
O 2.3
Answer:
7.9
Explanation:
pH=-log([H+])
pH=-log(7.7×10⁻⁷M)
pH=6.113509275
Now, poH + pH = 14
Making poH the subject,
poH=14-pH
poH=14-6.113509275
poH=7.886490725
≈7.9
∴poH≈7.9
What is an analogy for electronegativity?
Answer: I have no idea but if your in chemistry could you figure this out for me please If 3.25 moles of Ar occupies 100.L at a certain temperature and pressure, what volume does 14.15 moles of Ar occupy?
Explanation:
Answer:
Electronegativity is like a tug of war game between two atoms. If you have one person on the side of the rope that is stronger than the other person, then that stronger person will tug harder pulling the other person in their direction.
What is the scale that measures the acidity or basicity of a solution?
A. Concentration
B. Compound
C. Neutralization
D. pH
Answer:
PH scale is a universal indicator of strongness of base and acid
Consider the following reaction: Solid zinc was added to 1.0 M HC1.
After 20.0 s, the temperature of the container increased by 0.5°C and 25.00 mL of
H2 was produced. The rate of this reaction was
Answer:
1.25 mL/s
Explanation:
Your are told that 25.0 mL of H2 was produced 20 seconds. This is equal to rate 25/20 = 1.25 mL/s
When a reaction progresses, the reactant concentration gradually decreases and the product concentration gradually increases. Here the rate of the reaction is 1.25 mL/s.
What is rate of reaction?The rate of a chemical reaction is defined as the rate of decrease of concentration of a reactant or the rate of increase of concentration of a product. The rate of the reaction is usually expressed in units mol L⁻¹s⁻¹. The rate of the reaction are affected by several factors like concentration of the reactants, temperature, etc.
An equation which expresses the experimentally observed rate of a reaction in terms of the molar concentration of the reactants which determine the rate of the reaction is called rate equation.
Here it is seen that 25.0 mL of H2 was produced 20 seconds. So the rate is given as:
Rate = 25/20 = 1.25 mL/s
Thus the rate of the reaction is 1.25 mL/s.
To know more about rate of reaction, visit;
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#SPJ2
Determine the pH of a 2.8 ×10−4 M solution
of Ca(OH)2.
Answer:
pH = 10.75
Explanation:
To solve this problem, we must find the molarity of [OH⁻]. With the molarity we can find the pOH = -log[OH⁻]
Using the equation:
pH = 14 - pOH
We can find the pH of the solution.
The molarity of Ca(OH)₂ is 2.8x10⁻⁴M, as there are 2 moles of OH⁻ in 1 mole of Ca(OH)₂, the molarity of [OH⁻] is 2*2.8x10⁻⁴M = 5.6x10⁻⁴M
pOH is
pOH = -log 5.6x10⁻⁴M
pOH = 3.25
pH = 14-pOH
pH = 10.75Ethyl alcohol has a density of 0.80 g/mL. What is the volume of 44g of ethyl alcohol
ANSWER CHOICES
55 mL
35 mL
42 mL
0.80 mL
Answer:
55mL
Explanation:
44g / 0.8g/mL = 55mL
. Round to the nearest whole number
.Do not include units in your answer, just the number
1kg=2.2lb
Answer:
21091mg of aspirin the person need to consume
Explanation:
To solve this question we must find the mass of the person in kg. Knowing the lethal dose for aspirin is 400mg/kg of person, we can find the amount of aspirin that the person need to consume to get a lethal dose:
Mass person:
116lb * (1kg / 2.2lb) = 52.7kg
Lethal dose:
52.7kg * (400mg / kg) =
21091mg of aspirin the person need to consume