Answer: The concentration, in moles per litre, of a solution formed when 13.0 g of calcium hydroxide is dissolved in 5.0 L is 0.036 M
Explanation:
Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.
[tex]Molarity=\frac{n}{V_s}[/tex]
where,
n = moles of solute
[tex]V_s[/tex] = volume of solution in L
moles of [tex]Ca(OH)_2[/tex] = [tex]\frac{\text {given mass}}{\text {Molar mass}}=\frac{13.0g}{74g/mol}=0.18mol[/tex]
Now put all the given values in the formula of molality, we get
[tex]Molarity=\frac{0.18}{5.0L}=0.036M[/tex]
Therefore, the concentration, in moles per litre, of a solution formed when 13.0 g of calcium hydroxide is dissolved in 5.0 L is 0.036 M
Complete the sentence
Ice crystals forming on a
window is a
physical change
chemical change
Answer:
Explanation:
physical change
How many miles of H2SO4 are present in 1.63 liters of a 0.954 M solution
Answer:
1.555 moles
Explanation:
Mass of sulfuric acid is 98.079g/mol
One liter of 0.954 solution has 0.954 mols
1.63 liters will have 0.954x1.63 = 1.555moles
What type of energy is used to power up the lite bulb?
When the light bulb turns on, energy is being converted into what forms? How do you know?
What happens when you increase the voltage of the battery? Explain using terms like light, thermal, electric energy.
Answer: electrical energy
Heat
electric current
Explanation:
In your common lightbulb you will transform electrical energy into two main forms of energy coming off of the lightbulb. Heat: from the filament of the bulb because you are running an electrical current through the filament. The heat is so immense that it forms our second form of energy, which is light!
HELP I NEED TO SHOW HOW TO GET THESE TWO ANSWERS!!!
Aluminum will react with sulfuric acid in the following reaction.
2Al(s) + 3H2SO4(l) → Al2(SO4)3(aq) + 3H2(g)
a. How many moles of H2SO4 will react with 18 mol Al? ans: 27 mol H2SO4
b. How many moles of each product will be produced?
ans: 27 mol H2, 9 mol Al2(SO4)3
Answer:
A. the ration is 2 to 3, 2Al + 3H2SO4 has the same balance as 18Al + 3H2SO4
2/3 = 18/27
B. Doesn't need an explanation other than the work you did to balance it.
The moles of sulfuric acid reacted with the reaction has been 27 moles. The moles of hydrogen produce is 27 mol, and aluminum sulfate is 9 mol.
What is stoichiometric law?
The moles of reactant reacted in the reaction, and the moles of product produced, can be given by the stoichiometric law.
According to the stoichiometric law, the moles of product produces, and the reactant reacted is given by the stoichiometric coefficient.
In the given reaction, 3 moles of sulfuric acid reacts with 2 moles of Al. The moles of sulfuric acid reacted with 18 moles of aluminum will be given as:[tex]\rm 2\; mol\;Al=3\;mol\;H_2SO_4\\\\18\;mol\;Al=\dfrac{3}{2}\;\times\;18\;mol\;H_2SO_4\\\\ 18\;mol\;Al\;=27\;mol\;H_2SO_4[/tex]
Thus, the moles of sulfuric acid reacted in the reaction are 27 moles.
The stoichiometric law gives the formation of 1 moles of aluminum sulfate from 2 moles of Al. The moles of aluminum sulfate produced from 18 moles Al is given as:[tex]\rm 2\;mol\;Al=1\;mol\;Al_2(SO_4)_3\\\\18\;mol\;Al=\dfrac{1}{2}\;\times\;18\;mol\;Al_2(SO_4)_3\\\\ 18\;mol\;Al=9\;mol\;Al_2(SO_4)_3[/tex]
The moles of aluminum sulfate produced in the reaction are 9 moles.
The moles of hydrogen produced from 2 moles of Al are 3 moles. the moles of hydrogen produced from 18 mol Al has been:
[tex]\rm 2\; mol\;Al=3\;mol\;H_2\\\\18\;mol\;Al=\dfrac{3}{2}\;\times\;18\;mol\;H_2\\\\ 18\;mol\;Al\;=27\;mol\;H_2[/tex]
The moles of hydrogen produced in the reaction are 27 moles.
Learn more about moles produced, here:
https://brainly.com/question/10606802
The number of electrons in a neutral atom of hydrogen (H) atom is
what tool do you have to use to precise amount of water? A meter stick B stopwatch C balance D graduated cylinder E beaker F thermometer
Answer:
graduated cylinder
Explanation:
It shows exact volume very precisely.
What heat is liberated in the formation of 10.0 grams of sulfur hexafluoride, SF6, from the elements sulfur and fluorine?
Answer:
[tex]Q=-76.7kJ[/tex]
Explanation:
Hello,
In this case, for such formation of sulfur hexafluoride, the standard enthalpy of formation is -1220.47 kJ/mol (data extracted from NIST database). Next, we compute the moles in 10.0 grams of sulfur hexafluoride as shown below:
[tex]n_{SF_6}=10.0gSF_6*\frac{1molSF_6}{146.06 gSF_6}=0.0685mol[/tex]
Next, for the given energy, we compute the total heat that is liberated:
[tex]Q=-1220.47\frac{kJ}{mol}*0.0685 mol\\\\Q=-76.7kJ[/tex]
Finally, we conclude such symbol has sense since negative heat is related with liberated heat.
Best regards.
Answer:
83.5 kJ
Explanation:
Molar mass is 146.053. Moles of 10.0 g = 0.0685 mol. Multiply by 1220 kJ/mol for the answer of 83.5 kJ.
Identify whether this describes heat or temperature.
Definition: a form of energy
What are consequences for an animal if it attacks
Answer:
it gets euthanized. or it gets put down
If a solution has a pOH of 8.71, what is the [H+]?
Answer: [tex]5.1\times 10^{-6}M[/tex]
Explanation:
pH or pOH is the measure of acidity or alkalinity of a solution.
pH is calculated by taking negative logarithm of hydrogen ion concentration.
[tex]pH=-\log [H^+][/tex]
[tex]pH+pOH=14[/tex]
Putting in the values:
[tex]pH=14-8.71=5.29[/tex]
[tex]5.29=-log[H^+][/tex]
[tex][H^+]=5.1\times 10^{-6}[/tex]
Thus [tex][H^+][/tex] is [tex]5.1\times 10^{-6}M[/tex]
What does this “e” mean in science atoms molecules etc etc
Answer:
electron in physics , and Element in chemistry.
What is the scale factor?
Answer:
Scale Factor: 1 : 2
X = 11
Explanation:
3 / 3 = 1
6 / 3 = 2
The scale factor should be 1:2
So 'X' should be 11 since 5.5 * 2 = 11
Which of the following compounds has the highest boiling point?
a) butane
b) butanoic acid
c) butanal
d) ethyl acetate
Answer:
Butanoic acid
Explanation:
If you have a substance that has molarity of .200M and then you increase the molarity to .300M, which molarity would increase the rate of reaction, if used in an experiment? Why? PLEASE ASAP due in an HOUR
Answer:
.300M
Explanation:
It is necessary for us to remember that increasing the reactant concentration increases the rate of reaction. This is because reactant concentration is one of the most important factors that affects the rate of reaction.
Reactant concentration affects the rate of reaction because according to collision theory, chemical reaction results from effective collisions between reactants. Hence, if there are more reactants in the system, there are greater chances of effective collisions between the reactants.
Since 0.300M is a higher concentration than 0.2000M, the rate of reaction will increase when a 0.3000M solution is used.
need right now, please help :)
Two planets are orbiting a star. Planet A is two times closer to the star than planet B. Which planet orbits at a higher speed?
a.) Planet A
b.) Planet B
c.) they both orbit at the same speed
Answer:
planet A
Explanation:
because it doesn’t have to go as far when it orbits
how many atoms are in 95 grams of copper
Answer:
Here's a quick conversion before I answer your question, use it whenever needed.
1 moles Copper to grams = 63.546 grams. 2 moles Copper to grams = 127.092 grams. 3 moles Copper to grams = 190.638 grams. 4 moles Copper to grams = 254.184 grams. 5 moles Copper to grams = 317.73 grams. 6 moles Copper to grams = 381.276 grams. 7 moles Copper to grams = 444.822 grams.
Ok, now I'll answer your question.
Atomic masses are given in atomic mass units. One atomic mass unit is equal to one gram per mole. When you add these together for a compound, you get the molar mass of that compound. For example, silicon dioxide consists of one silicon atom and two oxygen atoms. The atomic mass of silicon is 28 grams and the atomic mass of oxygen is 16 grams.
(Hope the conversion and the answer helped) Sky
HELP PLS!!! WILL GIVE BRAINLIEST!!!
Which of the following would be evidence that a chemical reaction has occurred? (Select all that apply.) *
a change in shape
a precipitate is formed
an unexpected change in color
the formation of gas bubbles
smoke begins to form
clear liquids remain clear
the odor changes
the substance becomes very cold
A student decreases the temperature of a 556 c m cubed balloon from 278 K to 231 K. Assuming constant pressure, what should the new volume of the balloon be?
Question 1 options:
924cm3
417cm3
347cm3
876cm3
Answer:
The new volume of the balloon be [tex]462\ cm^3[/tex].
Explanation:
We have,
Initial volume is 556 cm ³
The temperature of the balloon decreases from 278 K to 231 K.
We need to find the new volume of the balloon if the pressure is constant.
The Charles law states that at constant pressure, the volume of gas is directly proportional to its temperature i.e.
[tex]V\propto T[/tex], P is constant
[tex]\dfrac{V_1}{V_2}=\dfrac{T_1}{T_2}[/tex]
[tex]V_2=\dfrac{V_1T_2}{T_1}\\\\V_2=\dfrac{556\times 231}{278}\\\\V_2=462\ cm^3[/tex]
So, the new volume of the balloon be [tex]462\ cm^3[/tex].
what do we call a group that comes off of the main carbon chain
Answer:
I believe it is an Alkane
Explanation:
What is the term for the set of steps that scientists use to gather reliable
information?
Answer:
I think it would be Scientific Method.
Electron dot structure for Acetophenone??
PLEASEEEEEEEE HELPPPPPP I BEGGGGG FOR HELPPPPP PLEASEEEE
How many molecules are in 25.4 grams of dinitrogen pentoxide, N2O5?
Answer: There are [tex]1.415\times 10^{23}[/tex] molecules in 25.4 g of [tex]N_2O_5[/tex]
Explanation:
According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
To calculate the moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}=\frac{25.4g}{108g/mol}=0.235moles[/tex]
1 mole of [tex]N_2O_5[/tex] contains = [tex]6.023\times 10^{23}[/tex] molecules
Thus 0.235 moles of [tex]N_2O_5[/tex] contains = [tex]\frac{6.023\times 10^{23}}{1}\times 0.235=1.415\times 10^{23}[/tex] molecules.
There are [tex]1.415\times 10^{23}[/tex] molecules in 25.4 g of [tex]N_2O_5[/tex]
URGENT HELP NEEDED! PLEASE ANSWER WITH EXPLANATION*
Much appreciated
1) An 85.0 g sample of copper is initially at 22.2 ∘C What is the final temperature if the sample absorbs 2.35 kJ of heat?
The specific heat of Cu is 0.385 J/(g^ Degree C)
-----------------------------------------------------------------------------------------------------------------------------
2) A 75.0 g sample of aluminum is heated to 65.3 ∘C then allowed to cool. What is the final temperature if the sample releases 2.07 kJ of heat?
The specific heat of Al is 0.903 J/(g degree C)
Answer:
1) 94.0° C, 2) 34.7°C
Explanation:
1)
Q=mcΔt° =mc(t2 - t1)
2350 J = 85.0 g* 0.385 J/(g*°C) *(t2 - 22.2°C)
t2 - 22.2°C = 71.81°C
t2 = 94.0° C
2)
Q=mcΔt° =mc(t2 - t1)
- 2070 J = 75.0 g * 0.903 J/(g*°C) *(t2 -65.3°C)
t2 - 65.3°C = - 30.56°C
t2 = 34.7°C
Could the increase in algae in the neighborhood lake be related to Sara’s farm?
Answer:
The increase in algae could be related to Sarah's farm due to her use of fertilizer to grow her crops Fertilizers contain high amount of nitrogen and help produce strong, healthy crops but they can also wash into lakes and rivers. It is however likely that the lake contains some of the fertilizer from Sarah's farm.
Sample response : The increase in algae could be related to Sarah’s farm due to her use of fertilizer. Fertilizers help produce strong, healthy crops, but they can also wash into lakes and rivers. When they do, they provide a large food supply for the algae living there, which can cause the algae population to increase dramatically. Samples from the neighborhood lake show high levels of phosphorus and nitrogen, the key ingredients of most fertilizers, and a large increase in the algae population. It is therefore likely that the lake contains some of the fertilizer from Sarah’s farm.
Explanation:
well if you arent doing it on edge then good luck ;)
Why is it important to have the myelin sheath not covering the entire axion ?
Answer
safety
Explanation:
you have to be safe when dealing with chemicals
A _________ is the distance light travels in one year. How many miles is this?
Answer:
a light year is the distance light travels in one year. 6 trillion miles!!
Explanation:
5. A gas occupies 2000. Lat 100.0 K and exerts a pressure of 100.0 kPa. What volume will
the gas occupy if the temperature is increased to 400. K and the pressure is increased to
200. kPa?
Answer:
4000 L
Explanation:
Step 1:
Data obtained from the question. This include the following:
Initial volume (V1) = 2000 L.
Initial temperature (T1) = 100 K.
Initial pressure (P1) = 100 kPa.
Final temperature (T2) = 400 K.
Final pressure (P2) = 200 kPa.
Final volume (V2) =..?
Step 2:
Determination of the new volume of the gas.
The new volume of the gas can be obtained by using the general gas equation as follow:
P1V1/T1 = P2V2/T2
100 x 2000/100 = 200 x V2/400
Cross multiply to express in linear form.
100 x 200 x V2 = 100 x 2000 x 400
Divide both side by 100 x 200
V2 = (100 x 2000 x 400)/(100 x 200)
V2 = 4000 L
Therefore, the new volume of the gas is 4000 L
what tool do you need to use to find temperature of hot chocolate a meter stick b stopwatch c balance d graduated cylinder e beaker f thermometer
Answer:
Explanation:
I believe u should use a thermometer coz its better and u will be able to find the temperature more accurately!!
Which statement describes an open circuit? The circuit is incomplete and broken, and the lights in the circuit shine. The circuit is complete and unbroken, and the lights in the circuit shine. The circuit is incomplete and broken, and the lights in the circuit do not shine. The circuit is complete and unbroken, and the lights in the circuit do not shine.
Answer:
the third option
Explanation:
The circuit is incomplete and broken, and the lights in the circuit do not shine.
An open circuit means an incomplete circuit.
The first option is wrong since the lights do not shine in an open circuit.
The second option is wrong since an open circuit is incomplete.
The fourth option is also wrong since an open circuit is broken or incomplete.
∴ The third option is correct.
Answer: C. The circuit is incomplete and broken, and the lights in the circuit do not shine.
A baseball pitcher throws a fastball to a batter.
Answer:
2nd option
Explanation: