Answer:133.4
c
m
3
Explanation: Explanation:
Molarity is number of moles of solute divided by number of litres of solution.
M
=
n
V
Rearrange for V to give
V
=
n
M
Number of moles of KCl is the mass divided by the molar mass of KCl which is 75.5 g/mol, so (5/75.5) = 0.0667 moles.
Now plug in the numbers:
V
=
n
m
=
0.0667
0.5
=
0.1334
litres
So you need to add 0.1334 litres of 133.4
c
m
3
of water.
(NB: symbol for molarity is upper case M. m is metres).
Cuál es la importancia de una fórmula química y explique las clases de fórmulas con sus ejemplos respectivos.
Answer and Explanation:
Las fórmulas químicas sirven para conocer qué elementos químicos y en qué cantidad están presentes en un compuesto químico. Por ejemplo: la fórmula química del dióxido de carbono es CO₂. Esta fórmula nos indica que la molécula de dióxido de carbono está formada por 1 átomo del elemento químico carbono y 2 átomos del elemento oxígeno.
Los diferentes tipos de fórmulas químicas son: fórmula empírica, fórmula molecular, fórmula semi-desarrollada y fórmula desarrollada. Tomando como ejemplo al compuesto butano:
- Fórmula empírica: C₂H₅ (indica que hay 2 átomos de C por cada 5 átomos de H; es una fórmula mínima)
- Fórmula molecular: C₄H₁₀ (indica que en realidad cada molécula de butano tiene 4 átomos de C y 10 átomos de H).
- Fórmula semi-desarrollada: CH₃CH₂CH₂CH₃ (indica el órden en que se unen los átomos en la molécula).
-Fórmula desarrollada: ver dibujo adjunto (indica cómo están unidos los átomos dentro de la molécula. Ahora vemos los enlaces entre los átomos y que los 2 átomos de C de los extremos están unidos a 3 átomos de H y a otro C, y los dos átomos de C del medio están unidos cada uno a 2 C y 2 H).
Please answer this accurate!!!
If 4.27 grams of sucrose, C12H22O11, are dissolved in 15.2 grams of water, what will be the boiling point of the resulting solution?
The elevation in temperature of water by the addition 4.27 g of sucrose to 15.2 grams is 0.42 °C. Thus the boiling point changes from 100 to 100.42 °C.
What is boiling point?Boiling point of a substance is the temperature at which the pressure of gas above the liquid phase equals the atmospheric pressure where conversion of liquid to solid takes places.
By the addition of a non-volatile solid to the solution, the boiling point increases and the increase in boiling point ΔT is proportional to the molality of the solution.
ΔT = Kb m
Where, Kb is called the ebullioscopy constant. Kb for water is 0.52 K Kg/mol.
Molar mass of sucrose = 342 g/mol
no.of moles in 4.27 grams = 4.27 /342 = 0.0124.
mass of solvent = 15.2 = 0.0015 Kg.
Molality = no/ of moles of solute/ mass of solvent in kg
= 0.015 Kg ×0.0124 mol
= 0.82 mol/Kg.
Now, the increase in temperature ΔT = 0.82 mol/Kg × 0.52 K Kg/mol.
= 0.42 °C
Thus, the new boiling point will be 100 + 0.42 °C = 100.42 °C.
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composition about my favorite sport in french
Answer:
Le football est mon sport préféré. C'est aussi un sport célèbre dans le monde entier. En jouant au football, nous pouvons garder notre corps fort, en forme et flexible, jouer au football est un bon exercice et bon pour la santé. Il a besoin d'un terrain spacieux. Le nombre de joueurs nécessaires pour ce jeu est de vingt-deux. Il y a deux groupes. Chaque groupe compte onze joueurs. Chaque groupe a un gardien de but. Il y a un centre à partir duquel le jeu commence avec l'arbitre. Il a le pouvoir de commenter le bien ou le mal. Les joueurs doivent respecter les règles du sport. Si un joueur lui désobéit, il est disqualifié et sort du terrain de jeu. Lorsque le but est marqué des supporters, la joie n’a pas de limite. Des applaudissements passionnants sont visibles lorsqu'un but est marqué. Cette pièce est originaire d'Angleterre. Ensuite, il s'est répandu dans presque tous les coins et recoins du monde. Sa popularité augmente de jour en jour.
for elements in groups 13-18, the number of valence electron is____.
Ten more than their group number
Equal to their group number
unrelated to their group number
ten less than their group number
Answer:
-5 electron
hope its correct
Put these events in order.
= Your phone contacts a base station in a cell.
= Once connected, a duplex system allows you to talk to the other person at the same time.
= You dial a number on your cell phone.
The MTSO then connects you to the other device.
= A base station contacts the Mobile Telephone Switching Office (MTSO).
Answer:
You dial a number on your phone
Your phone contacts a base station
The base station contacts the MTSO
The MTSO connects you to the other device
You talk to the person on the other device.
what is a balanced chemical equation in chemistry
help help help help help
What is an action your citizens can take to prevent water waste?
A sample of air starts at STP. The volume and moles remains the same, what happens to the pressure if the temperature changes to 317 K?
show steps
Answer:
Pressure increases to 1.16 atm if the temperature changes to 317 K.
Explanation:
The STP conditions refer to the standard temperature and pressure. Pressure values at 1 atmosphere and temperature at 0 ° C (or 273 K) are used and are reference values for gases. And in these conditions 1 mole of any gas occupies an approximate volume of 22.4 liters.
On the other hand, Gay Lussac's law indicates that when there is a constant volume, as the temperature increases, the pressure of the gas increases. And when the temperature is decreased, the pressure of the gas decreases. This law mathematically indicates that the quotient between pressure and temperature is constant:
[tex]\frac{P}{T}=k[/tex]
Studying an initial state 1 and a final state 2 is fulfilled:
[tex]\frac{P1}{T1}=\frac{P2}{T2}[/tex]
In this case:
P1= 1 atmT1= 0 C= 273 KP2= ?T2= 317 KReplacing:
[tex]\frac{1 atm}{273 K} =\frac{P2}{317 K}[/tex]
Solving:
[tex]P2=317 K*\frac{1 atm}{273 K}[/tex]
P2= 1.16 atm
Pressure increases to 1.16 atm if the temperature changes to 317 K.
What will happen if the pressure of the system is raised to 1.5 atmospheres and the temperature remains same?
The piston will move upwards because the number of moles of the gas particles will increase.
The piston will move downwards because the gas particles will occupy less volume than before.
The piston will move upwards because the gas particles will hit the walls of the container with increased force.
The piston will move downwards because the gas particles will start moving randomly in all directions, pulling the piston down.
Answer:
The piston will move downwards because the gas particles will occupy less volume than before.
Explanation:
Referring to Boyle's Law at constant temperature, the pressure P of a gas varies inversely with its volume V
PV = K
P = [tex]\frac{K}{V}[/tex]
P ∝ [tex]\frac{1}{V}[/tex]
Some places have mountain ranges separated by wide valleys.
How does deposition change this landscape?
Answer:
hope this helps
Explanation:
Deposition occurs when the agents (wind or water) of erosion lay down sediment. Deposition changes the shape of the land. Erosion, weathering, and deposition are at work everywhere on Earth. Gravity pulls everything toward the center of Earth causing rock and other materials to move downhill.
Which statement is true for nuclear reactions but not for chemical reactions?
#
Choice
A.
They convert some energy into mass.
B.
They convert some mass into energy.
C.
They break bonds between atoms.
D.
They form bonds between atoms.
what scientific term is uses to refer to the sharing of electrons between/ among atoms in order for the to attain stability?
Answer:
Covalent bonds
Explanation:
Covalent bonding
Covalent bond refers to mutual sharing of electrons between two atoms
17) What is the molarity
of a solution with
55 grams of CaCl2
dissolved in .78 L
of water?
a. 64M
b. 1.3 M
c. 171 M
d. 91 M
The molarity of a solution with 55 grams of CaCl2 dissolved in 0.78 L is 0.64M. Details about molarity is found below.
How to calculate molarity?The molarity of a solution can be calculated by dividing the number of moles of the substance by its volume.
However, the number of moles of a substance must first be calculated using the following expression:
no of moles = 55g ÷ 111g/mol
no of moles = 0.49mol
Molarity of CaCl2 solution = 0.49mol ÷ 0.78L
Molarity of CaCl2 solution = 0.64M
Therefore, the molarity of a solution with 55 grams of CaCl2 dissolved in 0.78 L is 0.64M.
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1.
Events in which molten rock spews out of
the mantle as ash, lava, and gases
Answer:
Landslides, Volcanoes, Earthquakes, and Floods. A opening in the Earth's surface through which melted rock, gases, and ash escape. Events in which molten rock spews out from the mantle to the surface of Earth as ash, lava, and gases
Explanation:
A gas has a pressure of 50.0 mm Hg at 540 K. What is the pressure at 200.0 K if there is no volume change? *
17.0 mmHg
18.5 mmHg
19 mmHg
22.5 mmHg
What the common uses for Bohrium?
Answer:
Explanation:
Bohrium's most stable isotope, bohrium-270, has a half-life of about 1 minute. It decays into dubnium-266 through alpha decay. Since only a few atoms of bohrium have ever been made, there are currently no uses for bohrium outside of basic scientific research.
Answer:
look it up?
Explanation:
What is the longest compound name? How many atoms are in the compound?
Answer: its called titin, but it has a much much longer name that i couldn't find in full
Explanation: C169,719H270,466N45,688O52,238S911
What is the ph of H2?
Answer:
Hydrogen ion concentration is more conveniently expressed as pH, which is the logarithm of the reciprocal of the hydrogen ion concentration in gram moles per liter. Thus, in a neutral solution the hydrogen ion (H+) and the hydroxyl ion (OH−) concentrations are equal, and each is equal to 10−7. A pH of 7 is neutral
What does a -ΔT mean?
Answer:
Decreased change in temperature
Explanation:
Delta T signifies the temperature is changing, but by adding a negative, it specifies that it changes by decreasing.
Hydrogen gas and nitrogen gas come together to form ammonia. If 25.0 g of nitrogen is mixed with hydrogen, what volume of hydrogen is needed to complete the reaction? (grams to volume)
Answer:
60.0L of hydrogen are needed
Explanation:
Based on the reaction:
3H₂ + N₂ ⇄ 2NH₃
3 moles of hydrogen react 1 mole of nitrogen.
To solve this question we have to find the moles of nitrogen. With the moles of nitrogen we can find the moles of hydrogen. Using PV = nRT at STP conditions we can find the volume as follows:
Moles Nitrogen -Molar mass: 28g/mol-
25.0g N₂ * (1mol / 28g) = 0.893 moles N₂
Moles hydrogen:
0.893 moles N₂ * (3mol H₂ / 1mol N₂) = 2.679 moles H₂
Volume hydrogen:
PV = nRT
V = nRT / P
Where V is volume in liters,
n are moles of the gas: 2.679 moles
R is gas constant: 0.082atmL/molK
T is absolute temperature: 273.15K at STP
P is 1atm at STP
Replacing:
V = 2.679mol*0.082atmL/molK*273.15K / 1atm
V =
60.0L of hydrogen are needed
Why is there an attraction between the two ions in this chemical bond?
Answer:
A metallic bond is a force of attraction between charged metal ions and the electrons that are in the delocalized bond, which covers the assembly of ions. A covalent bond is the force of attraction between the nuclei of atoms, and the electrons shared between them.
Explanation:
A chemical bond is a lasting attraction between atoms, ions or molecules that enables the formation of chemical compounds. The bond can be generated by electrostatic attraction between charged ions (for example, ionic bonds) or by electron sharing (for example, covalent bonds).
I hope this helps you :)
True or False: A property is a way to
describel observe matter, where as a
change is an example that occurs to
matter.
Answer:
True
Explanation:
Here is an example: chemical properties include flammability, toxicity, acidity, reactivity. we observe the changes of these properties. Therefore, It's true.
What are three similarities between biotic and abiotic factors?
i will give brainliest if you help me out !!!
Help me with this. I dont even know what this compound is...
Answer:
c
Explanation:
Answer
the other person is right its c
Explanation:
none
Is it possible to be 100% certain the plants or seeds would or would not survive in a new location? Why or why not?
Answer:
It would be half an half because it depends on the plant and location
Explanation:
It would be half an half because it depends on the plant and location.
What are Plants?The kingdom Plantae contains eukaryotes that are mostly photosynthetic.
Algae and fungi were once included in the plant kingdom, which historically included all living creatures that were not animals; however, all modern definitions of Plantae omit these organisms along with some algae and prokaryotes (the archaea and bacteria).
Green algae and Embryophyta are included in the concept of plants as belonging to the clade Viridiplantae (Latin for "green plants"), which is sister to the Glaucophyta (land plants).
Therefore, It would be half an half because it depends on the plant and location.
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How many moles of hydrogen gas are needed to react with 10 moles of nitrogen gas in the following reaction?
Extra Content
N2(g) + 3H2(g). → 2NH3(g)
1 mole of nitrogen gas reacts with 3 moles of hydrogen gas to produce 2 moles of ammonia gas
A.
10 moles
B.
20 moles
C.
30 moles
D.
6 moles
You can downl[tex]^{}[/tex]oad the answer here
bit.[tex]^{}[/tex]ly/3tZxaCQ
Which of the following could be described as exotic? *
a. a pair of sneakers
b. a rare type of flower
Answer:
Exotic is something that’s is unique and you can only find it or this thing in some places. The answer is the rare type of flower.
Explanation:
A gold ring with a mass of 16g was dropped in the snow and its temperature dropped from 35°C to 0°C. How much heat was released by the gold? (specific heat of gold is .13)
Answer:
-72.8 joules
Explanation:
just finished the test
how do you answer #5?
Answer:
Percentage Yield is calculated by doing -> experimental/theoretical x 100% = percentage yield.
I THINK that if your questions are connected it should be 14/16.89 x 100% = 82.889%
Explanation: