Explanation:
#IHOPEIHELPYOU PA BRAINLY NA LANG POhow many atoms of potassium are in 4.25 g of potassium
Answer:
6.55 x 10^22 atoms K
Explanation:
Convert from grams to moles (using K molar mass)
K molar mass = 39.098 g/mol
4.25 g K x 1 mol K / 39.098 g K
[grams cancel out]
= 0.1087 mols K
Convert from moles to atoms (using Avogadro's number)
Avogadro's number = 6.0221 x 10^23
0.1087 mols K x 6.0221 x 10^23 atoms K / 1 mols K
[mols cancel out]
= 6.545987 x 10^22
[with proper significant digits.....]
= 6.55 x 10^22 atoms K
To lower the chance of suffering from decompression sickness (the bends), scuba divers use a mixture of gases in their air tank (typically oxygen and nitrogen gas in recreational dives). Assuming no other gas is present besides oxygen and nitrogen, if the mole fraction of oxygen present is 0.21, what is the partial pressure of nitrogen gas if the total pressure is 111.7 atm
Answer: The partial pressure of nitrogen gas if the total pressure is 111.7 atm is 88.243 atm.
Explanation:
Given: Mole fraction of oxygen = 0.21
Total pressure = 111.7 atm
It is known that the sum of moles fractions is always equal to 1. So, mole fraction of nitrogen is calculated as follows.
Mole fraction of nitrogen + mole fraction of oxygen = 1
Mole fraction of nitrogen = 1 - mole fraction of oxygen
Mole fraction of nitrogen = 1 - 0.21
Mole fraction of nitrogen = 0.79
Now, formula used to calculate the partial pressure of nitrogen is as follows.
[tex]P_{N} = X_{N} \times P_{total}[/tex]
where,
[tex]P_{N}[/tex] = partial pressure of nitrogen
[tex]X_{N}[/tex] = mole fraction of nitrogen
[tex]P_{total}[/tex] = total pressure
Substitute the values into above formula as follows.
[tex]P_{N} = X_{N} \times P_{total}\\= 0.79 \times 111.7 atm\\= 88.243 atm[/tex]
Thus, we can conclude that the partial pressure of nitrogen gas if the total pressure is 111.7 atm is 88.243 atm.
solve using the distributive property
- 592×7 + 592 × 3
Answer:
= -592 (7+3)
= 592 ×10
= -5920
hope it helps u
Mark me brainless
Hydrogen iodide can decompose into hydrogen and iodine gases. 2HI(g) H2(g) I2(g) K for the reaction is 0.016. Of 0.148 atm of HI(g) is sealed in a flask, what is the pressure of each gas when equilibrium is established
Solution :
Given :
Hydrogen iodide decomposes to hydrogen and iodine gas
[tex]$2 HI \ \ \ \Leftrightarrow \ \ \ \ H_2 \ \ \\ + \ \ I_2 $[/tex]
I 0.148 0 0
C -2a +a +a
E 0.148-2a a a
We know
[tex]$k_p=\frac{P(H_2)P(I_2)}{P(HI)^2}$[/tex]
[tex]$0.016=\frac{a^2}{(0.148-2a)^2}$[/tex]
[tex]$0.016^{1/2}=\frac{a}{0.148-2a}$[/tex]
[tex]$0.12649=\frac{a}{0.148-2a}$[/tex]
0.0187 = 1.2529 a
a = 0.0149
Therefore
P(HI) = 0.148 - 2a
= 0.148 - 2(0.0149)
= 0.1182 atm
P([tex]$H_2$[/tex]) = a
= 0.0149 atm
P([tex]$I_2$[/tex]) = a
= 0.0149 atm
Which statement below can NOT
be used when describing volume?
A. Volume is the amount of space that an object
occupies.
B. The volume of an object is the same as the
weight of that object.
C. Volume can be measured in cubic
centimeters.
D. Volume is calculated using a formula: V = 1x w
xh.
Answer:
the answer is B:
Explanation:
I hope it help.
PLS HELP ASAP I ONLY HAVE 7 min
On which of the following factors does the amount of energy absorbed by an endothermic reaction depend?
1. Number of reactants
2. Physical state of the reactant
3. Sum of the potential energy of the reactants and products
4. Difference in the potential energy of the reactants and products
Answer:
Option 3 and 4
Explanation:
In an endothermic reaction, the potential energy of the system increase. The potential energy of the reactant is less as compared to the potential energy of the products and hence additional energy is required to produce products.
The potential energy of the reactants depend on their chemical state and not the physical state. Hence, option 2 is not correct. Also, the number of reactant do not make any significant impact on the determination of potential energy of reactants. Thus, option 1 is also incorrect
The rate of reaction was measured during a chemical reaction. After the first 3 seconds, the rate of reaction was 1.8 x10−6 M/s. Which of the following would you expect after another 3 seconds?
The question is incomplete, the complete question is;
The rate of reaction was measured during a chemical reaction. After the first 3 seconds, the rate of reaction was 1.8 x10−6 M/s. Which of the following would you expect after another 3 seconds? a
The rate would be higher, and the concentration of reactants would be lower.
b
The rate would be higher, and the concentration of reactants would be higher.
c
The rate would be lower, and the concentration of reactants would be lower.
d
The rate would be lower, and the concentration of reactants would be higher.
Answer:
The rate would be lower, and the concentration of reactants would be lower.
Explanation:
The rate of reaction refers to how quickly or slowly the reactants disappear or the products appear in a given reaction. The rate of reaction depends on the concentration of the reactants. Thus, as concentration decreases with time, the rate of reaction decreases accordingly.
Therefore, reaction rates tend to decrease with time since the concentration of the reactants decrease with time as the reactants are being converted into products. Thus after three seconds, the rate would be lower, and the concentration of reactants would be lower. Hence the answer above.
Answer:
The rate would be lower, and the concentration of reactants would be higher.
Explanation:
I took the test and i think i got it right
g Which of the following is TRUE for a system that is in dynamic equilibrium? Which of the following is TRUE for a system that is in dynamic equilibrium? The concentration of products is equal to the concentration of the reactants. The forward reaction goes to 100% completion. Both the forward and reverse reactions come to a halt. The reaction rate of the forward reaction approaches zero. none of the above
Answer:
none of the above
Explanation:
A system is said to have attained dynamic equilibrium when the forward and reverse reactions proceed at the same rate. That is;
Rate of forward reaction = Rate of reverse reaction
The implication of this is that the concentrations of reactants and products remain constant when dynamic equilibrium is attained in a system. This does not mean that the reactant and product concentrations become equal; it rather means that their concentrations do not significantly change once dynamic equilibrium has been attained.
what mix of chemicles gives fireworks thier color: explain for each color
Answer:
Metal salts commonly used in firework displays include: strontium carbonate (red fireworks), calcium chloride (orange fireworks), sodium nitrate (yellow fireworks), barium chloride (green fireworks) and copper chloride (blue fireworks).
Explanation:
Answer:
Metal salts commonly used in firework displays include: strontium carbonate (red fireworks), calcium chloride (orange fireworks), sodium nitrate (yellow fireworks), barium chloride (green fireworks) and copper chloride (blue fireworks).
The colors are produced by heating metal salts, such as calcium chloride or sodium nitrate, that emit characteristic colors. ... Barium – Barium is used to create green colors in fireworks, and it can also help stabilize other volatile elements. Calcium – Calcium is used to deepen firework colors
Andrea is making a poster to show how the nervous system uses signals to send information through the body. These signals are sent through nerves. What parts should Andrea include in her diagram of a nerve as evidence to support her explanation?
neurons only
neurons, axons, and dendrites
dendrites, blood vessels, and muscle cells
axons, blood vessels, and connective tissue
Answer:b
Explanation:
=jskidwkjicdovfojvoeeeeeeeeeeeeeeeeeeeeeeeec
Answer:
you need a theripist or maybe just your girl if this is your question.
Explantion: you are clearly very weird but very cute and ily.
Which subatomic particles are transferred in a redox reaction?
Answer: Electrons
Explanation:
What is the volume, in cubic meters, of an object that is 0.21 m long, 4.7 m wide, and 5.3 m high?
Answer:
The formula for volume of a rectangle is length multiply by width multiply thus, 0.25 m multiply 6.1 m multiply by 4.9 m = 7.5m^3.
Explanation:
the least number of significant figures is 2 thus the final answer will have the same number of significant figures. 7.5m^3
PLEASE HELP ME!
WILL MARK BRAINLIEST
Water Cycle
Listed in the Item Bank are some important labels for sections of the image below. To find out more information about labels, some have more details available when you click on them. Drag and drop each label to the corresponding area it identifies in the image.
The one on the top left corner is condensation. The one below that is evaporation. The one below that in the water is accumulation. The one next to accumulation is ground flow. The one on the trees is transpiration. The one above transpiration is surface flow. The one above surface flow is precipitation and above precipitation it’s condensation. Lmk if you were able to get that.
which shows a disaccharide
Answer: It is :B:
Explanation: also sub to technoblade
balance the equation P + O2 → P4O10
What is the freezing point (in °C) of a 0.743 m
aqueous solution of KCI?
Enter your rounded answer with
3 decimal places.
K; for water = 1.86 °C/m
Answer: The freezing point (in °C) of a 0.743 m aqueous solution of KCI is [tex]2.763^{o}C[/tex].
Explanation:
Given: Molality = 0.743 m
[tex]K_{f}[/tex] for water = [tex]1.86^{o}C/m[/tex]
The equation for dissociation of KCl when dissolved in water is as follows.
[tex]KCl \rightarrow K^{+} + Cl^{-}[/tex]
As it is giving 2 ions. Therefore, Van't Hoff factor for it is equal to 2.
Formula used to calculate the freezing point is as follows.
[tex]\Delta T_{f} = i \times K_{f} \times m[/tex]
where,
i = Van't Hoff factor
[tex]K_{f}[/tex] = molal depression constant
m = molality
Substitute the values into above formula as follows.
[tex]\Delta T_{f} = i \times K_{f} \times m\\= 2 \times 1.86^{o}C/m \times 0.743 m\\= 2.763^{o}C[/tex]
Thus, we can conclude that the freezing point (in °C) of a 0.743 m aqueous solution of KCI is [tex]2.763^{o}C[/tex].
A chemical equilibrium exists when: A chemical equilibrium exists when: there are equal amounts of reactants and products. the rate at which reactants form products is the same as the rate at which products form reactants. the sum of reactant and product concentrations equals one mole. reactants are completely changed to products. the rate at which reactants form products becomes zero.
Answer: A chemical equilibrium exists when the rate at which reactants form products is the same as the rate at which products form reactants.
Explanation:
When the concentration of both the reactants and products do not change with time then it means the chemical reaction has reached to a state of chemical equilibrium.
For example, [tex]CO(g) + Cl_{2}(g) \rightleftharpoons COCl_{2}(g)[/tex]
Therefore, we can conclude that a chemical equilibrium exists when the rate at which reactants form products is the same as the rate at which products form reactants.
can someone please do the balanced equation for potassium fluoride?
Answer:
K + F2 = KF
Explanation:
Thats the balancee equation for potassium fluoride. The equation is 2K + F2 → 2KF and the balanced equation is K + F2 = KF
There are 6 different organisms in the picture above. Organize them into 2 or more groups AND defend your groups by
providing details about why you put them into the chosen groups.
Example on how to answer:
Group 1- XYZ
Group 2-LM
Group 3- PORS
I put XYZ in group 1 because...
I put LM together because...
I grouped PORS together because...
Explanation: they could be grouped by how they reproduce or they can be grouped by if there hetero or autotrophic
Which of the first four radioisotopes in the decay series has the longest half-life? Pa-234 Th-234 U-234 U-238
Answer:
can u explain a little more then i will help like what are the four
Explanation:
Answer:
d) U-238
Explanation:
edg 2021
How many grams of Ni are formed from 55.3 g of Ni2O3?
2Ni2O3(s)⟶4Ni(s)+3O2(g)
Answer:
39.2 g
Explanation:
2Ni₂O₃(s) ⟶ 4Ni(s) + 3O₂(g)First we convert 55.3 grams of Ni₂O₃ into moles of Ni₂O₃, using its molar mass:
55.3 g ÷ 165.39 g/mol = 0.334 mol Ni₂O₃Then we convert 0.334 moles of Ni₂O₃ into moles of Ni, using the stoichiometric coefficients of the balanced reaction:
0.334 mol Ni₂O₃ * [tex]\frac{4molNi}{2molNi_2O_3}[/tex] = 0.668 mol NiFinally we calculate how much do 0.668 Ni moles weigh, using the molar mass of Ni :
0.668 mol Ni * 58.69 g/mol = 39.2 gDetermine what mass of carbon monoxide and what mass of hydrogen are required to form 6.0 kg of methanol by the reaction CO(g) + 2H2(g) -> C H3OH(l)
Answer:
5250 grams or 5.25 kg of carbon monoxide and 375 grams of hydrogen are required to form 6 kg of methanol.
Explanation:
The balanced reaction:
CO (g) + 2 H₂ (g) -> CH₃OH (l)
By stoichiometry of the reaction, the following amounts of moles of each compound participate in the reaction:
CO: 1 moleH₂: 2 molesCH₃OH: 1 moleBeing the molar mass of each compound:
CO: 28 g/moleH₂: 1 g/moleCH₃OH: 32 g/moleBy reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
CO: 1 mole* 28 g/mole= 28 gramsH₂: 2 moles* 1 g/mole= 2 gramsCH₃OH: 1 mole* 32 g/mole= 32 gramsBeing 6 kg equivalent to 6000 grams (1 kg= 1000 grams), you can apply the following rules of three:
If by stoichiometry 32 grams of methanol are formed from 28 grams of carbon monoxide, 6000 grams of methanol are formed from how much mass of carbon monoxide?[tex]mass of carbon monoxide=\frac{6000 grams of methanol*28 grams of carbon monoxide}{32 grams of methanol}[/tex]
mass of carbon monoxide= 5250 grams= 5.25 kg
If by stoichiometry 32 grams of methanol are formed from 2 grams of hydrogen, 6000 grams of methanol are formed from how much mass of hydrogen?
[tex]mass of hydrogen=\frac{6000 grams of methanol*2 grams of hydrogen}{32 grams of methanol}[/tex]
mass of hydrogen= 375 grams
5250 grams or 5.25 kg of carbon monoxide and 375 grams of hydrogen are required to form 6 kg of methanol.
Suppose you have a solution that might contain any or all of the following cations: Cu 2, Ag , Ba 2, and Mn2 . The addition of HBr causes a precipitate to form. After the precipitate is filtered off, H2SO4 is added to the supernate, and another precipitate forms. This precipitate is filtered off, and a solution of NaOH is added to the supernatant liquid until it is strongly alkaline. No precipitate is formed. Which ions are present in each of the precipitates
Answer:
Ag⁺, Ba²⁺,
Explanation:
We can solve this question using the solubility rules:
When an Halide as Br- is added to a solution, the ions that can be precipitate are Ag⁺, Hg₂²⁺ and Pb²⁺.
That means the first ion present is Ag⁺
When sulfates, SO₄²⁻ are added, the ions that precipitates are: Ag⁺, Ca²⁺, Sr²⁺, Ba²⁺, Hg₂²⁺ and Pb²⁺
The second ion present is Ba²⁺
Hydroxides of Cu²⁺ and Mn²⁺ are insolubles but as no precipitate are formed when the solution is strongly alkaline those ions are not present.
Control rods in nuclear reactors are made of materials that absorb free neutrons in order to
slow down the chain reaction.
True
False
A or B or C or D, plz answer fassttt
Answer:
A.
Explanation:
They'd probably want to know the conditions that usually produce fog
In a receptacle we have 29 g of hydrochloric acid that react with an excess of ammonia according the following equation:
HCl + NH3 → NH4Cl
The percent yield of the reaction is 54 %. Determine:
1.Mass of ammonium chloride obtained.
2.How many moles of ammonium chloride are forme
Answer:
2969429th Ave
Explanation:
i dont know
When the ball is at rest, what forces are acting on it?
How is water important to many branches of science?
Answer:
Water is capable of dissolving a variety of different substances, which is why it is such a good solvent. And, water is called the "universal solvent" because it dissolves more substances than any other liquid. This is important to every living thing on earth.
A 0.227 mol chunk of dry ice (solid CO2) changes to gas. What is the volume of that gas measured at 27 °C and 740 mmHg?
Answer:
Explanation:3.2 ft 2 fti2 ft 4 ft ft2