Answer:
58.8 grams.
Explanation:
First we calculate how many HNO₃ grams are there in 400.0 g of a 10.0% solution:
Out of 100 g of a 10.0% solution, 10 g will be of HNO₃.400.0 g * 10.0/100 = 40 g HNO₃Then we calculate the mass of a 68.0% solution that would contain 40 grams of HNO₃:
40 g HNO₃ * 100 g Solution/68 g HNO₃ = 58.8 g2. In the electrolysis of water
(a) Name the gases liberated at anode and cathode.
(b) Why is it that the volume of gas collected on one electrode is two times that on the other
electrode?
(c) What would happen if dil.H,SO, is not added to water?
Answer:
In the electrolysis of water the gases collected in anode is oxygen and in cathode is hydrogen.
It is because water contains two molecules as compared to one molecules of oxygen.
If Dil.H,So, is not added in water then water doesn't conduct electricity.
Please make me brainiest answer
Consider the role of third world countries in this system. How would they benefit or not benefit from a cap and trade system?
Answer:
they would benefit
Explanation:
they would benefit because we can move more machines that reduce pollution in those countries.
Please hurry! And help!!
Best answer gets marked Brainliest!
NO LINKS or question will be REPORTED!
When two nitrogen atoms combine, they form a
A) Compound
B) Liquid
C) mixture
D) Molecule
Answer:
I guess the answer is compound
Explanation:
Coz compound it is on there playing with me again Go ahead and paste it in the class
Calculate the molar mass of Ca3(PO4)2
934.32 g Ca3(PO4)2 =______
moles Ca3(PO4)2
Answer:
Molar mass of Ca₃(PO₄)₂ = 310.18 g/mol934.32 g Ca₃(PO₄)₂ = 3.01 moles Ca₃(PO₄)₂Explanation:
The molar mass (MM) of Ca₃(PO₄)₂ can be calculated as follows:
MM of Ca₃(PO₄)₂ = (MM of Ca)*3 + [(MM of P) +(MM of O)*4]*2MM of Ca₃(PO₄)₂ = 310.18 g/molNow we can convert 934.32 g of Ca₃(PO₄)₂ into moles:
934.32 g ÷ 310.18 g/mol = 3.01 molesWhat is the lowest whole number ratio between the aluminum ion and carbonate ion in the compound, aluminum carbonate?
A. 2 :1
B. 1: 1
C. 3 : 2
D. 1 : 2
E. 2 : 3
Answer:
E. 2 : 3
Explanation:
Aluminium carbonate is a neutral compound made by aluminium ion, Al³⁺ and carbonate ion, CO₃²⁻. As is neutral, the formula must be:
Al₂(CO₃)₃.
2 Al₃⁺ = 6 positives charges
3 CO₃²⁻ = 6 negative charges
Thus, the simplest whole number ratio between Al³⁺ and CO₃²⁻ must be:
2:3
And right answer is:
E. 2 : 315men work in 80days .How long will it take to finish that work if 5men were added?
Answer:
80 day= 15 men
Explanation:
1 man takes = 80*15 = 1200 days
20 men take = 1200/20= 60 days
Answer:
80 days=15 men
Explanation:
hope it helps❣️
To increase the temperature of 100.0 g
of ice from -50.0? to -10.0?, how
much energy is required?
We are given:
Mass of ice = 100 grams
Initial temperature = -50°C
Final Temperature = -10°C
We know that the specific heat of ice is 2.09 joules / (gram * °c)
Heat Absorbed:
We know that:
ΔQ = mcΔT [where ΔQ is the heat absorbed]
ΔQ = (100 grams)(2.09)(-10 - (-50))
ΔQ = (100)(2.09)(40)
ΔQ = 8360 Joules
7. What is the pH of [OH-] = 1.0 * 10-5 solution?
О
1
5
14
9
Answer:
I'd 9 Coz is better than anything else I help so u need to other people that question don't be jealous of them
what are factors that affecting the boiling point of liquid?
what dose bioverisidy refer to
Answer:
The term biodiversity (from “biological diversity”) refers to the variety of life on Earth at all its levels, from genes to ecosystems, and can encompass the evolutionary, ecological, and cultural processes that sustain life.
or if you want a short answer:
The term “biodiversity” refers to the variety of living organisms.
Answer:
the term bioverisidy refer to the veriety of life on earth at all its levels from genes to ecosystem and ecompass the evolutionary ecological and cultural prosesses that sustain life
What chemical is used to represent compounds
Answer:
Compounds are represented by chemical formulas. Elements in a compound are represented by chemical symbols, and the ratio of different elements is represented by subscripts.
An Arrhenius base increases the concentration of hydrogen ions when dissolved in solution. (3 points)
Answer:
Explanation:
False
Answer:
false
Explanation:
took the test
How much is 1 mole of something?
Answer: D.
Explanation:
6.02 * 10^-23
Which substance has Delta.Hf defined as 0 kJ/mol?
A. H2O (s)
B. Ne (l)
C. F2 (g)
D. CO2 (g)
Answer:
its actually c
Explanation:
how much mercury-203 remains after 200 days
Answer:
50%
Explanation:
What is the [OH-] of a solution with a pH of 3.89?
Which one is it?
7.76 x 10^-11
1.29 x 10^-4
2.11 x 10^-6
4.51 x 10^-10
Answer:
the answer is 211106 is better than anything else about u and then let's go play with kids like that first time in the class ohh ok
Se hace reaccionar 4,00 g de aluminio y 42,00 g de bromo, según la reacción: Al(s)+Br2(l)⟶AlBr3(s) Calcular las moles de AlBr3(s) producido. PA: Al=27; Br=80
Answer:
0.145 moles de AlBr3.
Explanation:
¡Hola!
En este caso, al considerar la reacción química dada:
Al(s)+Br2(l)⟶AlBr3(s)
Es claro que primero debemos balancearla como se muestra a continuación:
2Al(s)+3Br2(l)⟶2AlBr3(s)
Así, calculamos las moles del producto AlBr3 por medio de las masas de ambos reactivos, con el fin de decidir el resultado correcto:
[tex]n_{AlBr_3}^{por\ Al}=4.00gAl*\frac{1molAl}{27gAl} *\frac{2molAlBr_3}{2molAl}=0.145mol AlBr_3\\\\n_{AlBr_3}^{por\ Br_2}=42.00gr*\frac{1molr}{160g Br_2} *\frac{2molAlBr_3}{3molBr_2}=0.175mol AlBr_3[/tex]
Así, inferimos que el valor correcto es 0.145 moles de AlBr3, dado que viene del reactivo límite que es el aluminio.
¡Saludos!
If a buffer solution is 0.190 M in a weak acid ( a=3.6×10−5) and 0.480 M in its conjugate base, what is the pH?
Solution :
[tex]pk_b = -log ( K_b)\\\\pk_b = - log ( 3.6 \times 10^{-5})\\\\pk_b = 4.44[/tex]
We know, pH of this solution :
[tex]pH = pK_a + log ( \dfrac{|conjugate\ base|}{|weak \ acid|}\\\\pH = 4.44 + log(\dfrac{0.480}{0.190})\\\\pH = 4.44 + 0.40\\\\pH =4.84[/tex]
Hence, this is the required solution.
Charles's Law: This law essentially states that gas volume has a direct relationship to temperature. If a football is inflated indoors during winter and then taken outside, what volume will be occupied inside the football if indoors the football is inflated at 26°c taking up 100 cm3, and it is 13°c outside?
Answer:
V2 = 95.65 cm^3 or 96 cm^3 (depends on if you want to round up or not)
Explanation:
Charles law is V1 / T1 = V2 / T2 (1 means initial and 2 means final condition)
For Charles law, you must use kelvin scale for temperature. So to convert from C to K, you add 273.15
T1 = 26 +273.15 = 299.15 K
T2 = 13 + 273.15 = 286.15 K
Now plug in the values,
100 / 299.15 = V2/286.15
V2 = 95.65 cm^3 or ~ 96 cm^3
The answer should make sense because if they have a direct relation, if one goes down then the other goes down. For final condition, we lowered the temperature so our volume should have decreased too and it did (we went from 100 to 96 cm^3)
mechanism of the reaction citric acid with sodium bicarbonate?
Explanation:
When citric acid and baking soda react with one another, they change chemi- cally and form sodium ions, citric acid ions, carbon dioxide gas, and water. ... It also makes up the bubbles in carbonated drinks and is a gas we naturally exhale. Carbon dioxide gas is safe in the quantities produced in the activities.
A “happy” atom is one that has a _________ valence orbital. octet rule
Answer:
Hello There!!
Explanation:
I believe the answer is 8.
hope this helps,have a great day!!
~Pinky~
Maintaining constant pressure, the volume of a gas is increased from 12,0 L
to 32.0 L by heating it. If the original temperature was 23.0°C, what is the
new temperature? *
23. 45 K
61.33 K
789.33 K
567.87 K
Answer:
790 K
Explanation:
Step 1: Given data
Initial volume of the gas (V₁): 12.0 LInitial temperature of the gas (T₁): 23.0 °CFinal volume of the gas (V₂): 32.0 LStep 2: Convert 23.0 °C to Kelvin
We will use the following expression.
K = °C + 273.15 = 23.0 + 273.15 = 296.2 K
Step 3: Calculate the final temperature of the gas
Assuming constant pressure and ideal behavior, we can calculate the final temperature of the gas using Charles' law.
T₁/V₁ = T₂/V₂
T₂ = T₁ × V₂/V₁
T₂ = 296.2 K × 32.0 L/12.0 L = 790 K
Titan, the largest moon of Saturn, has an atmosphere that is about 94% nitrogen (N2) and 6% methane (CH4). The molecular mass of nitrogen is 4.651e-26kg and the molecular mass of methane is 2.663e-26kg. The acceleration due to gravity at the surface is about 1.35 m/s^2. For this problem, assume that Titan's atmosphere is in thermal equilibrium at 100 K. What fraction of the atmosphere is methane at altitude 2 km
Answer:
9.493 e-01
Explanation:
Given that Titan's temperature at thermal equilibrium = 100 K
Determine the fraction of the atmosphere that is methane
at an altitude of 2 km
applying Ideal gas law
P = Po e^ -Z/k ---- ( 1 )
In this question Z = M₀ g z ( replace -Z in equation 1 with M₀gz )
P = Po e^- M₀gz / RT ------ ( 2 )
where : Mo = 16 * 10^ -3 kg/mol , g = 1.35 m/s^2 , z = 2 * 10^3 m , R = 8.3 J/mol.k , T = 100 k
insert values Back to equation 2
P = Po e^-0.052
P = 0.9493 Po
hence the fraction of the atmosphere that is methane
= P / Po = 9.493 * 10^-1
= 9.493 e-01
how can miscible liquids that different boiling points be separated
Answer:
By boiling and further condensing the liquid with the lowest boiling point.
Explanation:
Hello there!
In this case, according to the attached diagram, it turns out possible for us to infer that the mechanism whereby miscible liquids with different boiling points are separated is distillation, because the flask is heated until the boiling point of the liquid with the lowest value, in order to boil it and subsequently condense it, whereas the liquid with the highest boiling point remains in the flask; and therefore, the two liquids are separated.
Regards!
A beaker of 450g of water is heated from 4.0°C to 25.0°C on a hot plate. If the
specific heat of H2O is 4.18J/9°C how much energy has the water absorbed?
A 39,501 J
B 4.42 x 104
C 5.13 J
D 54,549 J
Answer: 5.13
Explanation: juss do it
Taking into account the definition of calorimetry, the water has absorbed 39,501 J.
CalorimetryCalorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).
So, the equation that allows to calculate heat exchanges is:
Q = c× m× ΔT
where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.
Energy that the water absorbedIn this case, you know:
Q= ?c= 4.18 [tex]\frac{J}{gC}[/tex]m= 450 g ΔT= Tfinal - Tinitial= 25 C - 4 C= 21 CReplacing in the definition of calorimetry:
Q = 4.18 [tex]\frac{J}{gC}[/tex]× 450 g× 21 C
Solving:
Q= 39,501 J
Finally, the water has absorbed 39,501 J.
Learn more about calorimetry:
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A nurse practitioner prepares 470. mL of an IV of normal saline solution to be delivered at a rate of 85 mL/h. What is the infusion time, in hours, to deliver 470. mL?
Answer: Infusion time is 5.5 h
Explanation: Time is 470 ml / 85 ml/h = 5.5 h
Select ALL of the abiotic factors
lesson 5.01
Question 1 options:
air
light
fungi
soil
salinity
Answer:
I think it should be
salinity and
light
If 50 mL of pure acetone is mixed with 450 mL of water, what is the percent by volume of acetone?
Answer:
10%
Explanation:
The percent by volume of acetone is given by the following formula:
% v/v = Volume of acetone / Total Volume * 100%
Now we calculate the total volume of the solution:
Total Volume = Volume of Acetone + Volume of Water
Total Volume = 50 mL + 450 mL = 500 mL
Then we calculate the percent by volume:
% v/v = 50 mL / 500 mL * 100 % = 10%
How many kilojoules (kJ) in 373 joules (J)?
Answer: There are 0.373 kJ in 373 joules.
Explanation:
According to the standard conversion units 1 kJ is equal to 1000 J. This means that 1 J is equal to 0.001 kJ.
Hence, 373 joules is converted into kilojoules as follows.
[tex]1 J = 0.001 kJ\\373 J = 373 J \times \frac{0.001 J}{1 kJ}\\= 0.373 kJ[/tex]
Thus, we can conclude that there are 0.373 kJ in 373 joules.
When fluorine (F) forms chemical compounds with metals, the fluorine atom gains electrons , looses electrons