Answer:
0.21 mole of NaCl
Explanation:
From the question,
using Avogadro's Constant,
1 mole of every compound contains 6.02×10²³ molecules of that compound.
I.e
1 mole of NaCl ⇒ 6.02×10²³ molecules of NaCl
x moles of NaCl ⇒ 1.25××10²³ molecules of NaCl
Solving for x,
x moles of NaCl = (1 mole of NaCl)×(1.25×10²³ molecules of NaCl)/(6.02×10²³ molecules of NaCl)
x moles of NaCl = (1×1.25×10²³)/6.02×10²³
x = 0.208 mole of NaCl
x ≈ 0.21 mole of NaCl
what is the nature of salt which is formed by the combination of weak acid and strong base And have a great day ❤️
what are two products that contain ammonia?
Which of the following statements correctly describes the relationship between volume and temperature( moles and pressure of gas are constant)
Answer:
pressure of gas are constant describe the relationship between moles and temprature
The statements correctly describes the relationship between volume and temperature is pressure of gas are constant.
What is pressure ?The force delivered perpendicularly to an object's surface per unit area across which that force is dispersed is known as pressure. In comparison to the surrounding pressure, gauge pressure is the pressure. Pressure is expressed using a variety of units.
The volume of a gas is directly proportional to the number of moles of gas when both temperature and pressure are constant. The pressure of a gas is directly proportional to the number of moles of gas when both temperature and volume are constant.
In layman's words, the volume of a fixed mass of gas is exactly proportional to temperature at constant pressure.
Thus, If the pressure and temperature remain constant, the volume of a gas is directly proportional to the number of moles in the gas.
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The process of energy being captured
by plants from the sun and then
transferred from one organism to the
next in the food chain is called
A food flow
B energy flow
C nutrient flow
D water flow
Answer:
B
Explanation:
I am not sure but I think it is B. Out of all the answers that one makes sense.
From the table of data, substance C will have the least of the original amount remaining after 30 days even though it started with the most.
which is the best explanation for this answer?
A)Substances A and B are not as radioactive since they have longer half-lives.
B)The states of matter for substances A & B are more volatile than substance C.
C)Substances that start with large amounts will always decay at faster rates.
D)Substance C goes through a significantly larger amount of half-lives compared to the other substances.
Answer:
D)Substance C goes through a significantly larger amount of half-lives compared to the other substances.
Explanation:
Half life refers to the time taken for a radioactive isotope to decay to half of the original amount of radioactive substance present initially.
The shorter the half life of a radioactive substance, the more the amount of half-lives the substance undergoes within the given time period. Substance A will undergo five half lives within 30 days. Substance B will undergo six half lives within 30 days while substance C will undergo ten half lives within 30 days.
Since Substance C undergoes the highest amount of half lives within 30 days, substance C will have the least of the original amount remaining after 30 days even though it started with the most.
How many grams are in 1,000 Lutheran of C2H4
Answer:
28.05316 grams
Explanation:
What living characteristics do viruses have?
when pressure is kept constant then the temperature varies with volume
a. directly
b. inversely
c. none of these
d. both a and b.
Answer:
A
Explanation:
Raise the temperature of 2 g of water 2°C.
Answer:
This heat requirement we can calculate by following relationship..
Q = m*C*∆T
We have, m = 2gm, C = 1 cal/g-degC, ∆T = 2 degC
Putting all these values in above equation we get
Q= 2*1*2 = 4 cal
H2CO3 -> H2O + CO2 What type of chemical reaction is taking place in this
chemical equation? *
O Synthesis
Decomposition
Single Replacement
Double Replacement
Combustion
Answer: decomposition
Explanation: one molecule forms tro molecules
Multiple Choice. For each statement, circle the correct answer.
9. Most of the energy that drives the water cycle comes from
a. The Sun
b. Earth's cores
c. Earth's oceans d. the equator
10.
is the driving force behind excess runoff after a big precipitation event.
a. precipitation b. steepness of a hill c. gravity
d. solar radiation
what are the three major types of water pollutants? Name and describe a few examples for each one.
Answer:
b
Explanation:
A squirrel ran 20 meters along the fence at a constant speed for 10
seconds. It stopped for 15 seconds and then quickly ran another 30 meters
at a constant speed for 15 seconds.*
A
B
Answer:
It's D
Explanation:
Sorry for the late answer. Since the squirrel ran constant speed for 10 seconds and it ran 20 meters the first point would be at (10,20) then since it stopped to rest for 15 seconds the next point would be (25,20) finally since it ran another 30 meters for 15 more seconds the next point would be at (40,50). Sorry if the answer isn't the best, i'm bad at explaining ;w;
Draw the product you expect from the reaction of (R)-2-bromooctane with -CN. Use the wedge/hash bond tools to indicate stereochemistry where it exists. Include H atoms at chiral centers only. If a group is achiral, do not use wedged or hashed bonds on it.
Answer:
See explanation and image attached
Explanation:
The reaction between (R)-2-bromooctane and -CN^- is an SN2 reaction. An SN2 reaction involves a synchronous attack of the nucleophile as the leaving group is departing.
This leads to a five member transition state in which a bond is being broken and another is being made. Since the nucleophile attacks from the backside, SN2 mechanism leads to inversion of configuration as shown in the image attached.
what is the oceanic and continental crust made out of ?
Answer:
Oceanic crust is generally composed of dark-colored rocks called basalt and gabbro. It is thinner and denser than continental crust, which is made of light-colored rocks called andesite and granite. The low density of continental crust causes it to “float” high atop the viscous mantle, forming dry land.
Explanation:
Assuming that the trends continue, which of the following compound will have the greatest solubility at 120 ℃? The graph below shows the solubility of a variety of compounds.
A. Ce2(SO4)3
B. K2Cr2O7
C. NaCl
D. Pb(NO3)2
Answer:
its c
Explanation:
i took the test and got a 100
Assuming that the trends continue, sodium chloride compound will have the greatest solubility at 120 ℃.
What is solubility?Solubility is defined as the ability of a substance which is basically solute to form a solution with another substance. There is an extent to which a substance is soluble in a particular solvent. This is generally measured as the concentration of a solute present in a saturated solution.
The solubility mainly depends on the composition of solute and solvent ,its pH and presence of other dissolved substance. It is also dependent on temperature and pressure which is maintained.Concept of solubility is not valid for chemical reactions which are irreversible. The dependency of solubility on various factors is due to interactions between the particles, molecule or ions.
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Guys what is this plz
Answer:
nunya
Explanation:
business
what happens to halogens on going top to bottom in their group
they remain as they are and don't change their type
What is the acid dissociation constant for an acid at equilibrium, HX = H+ +X- ?
Ka = [H+] [X-] ÷ [HX] is the acid dissociation constant for an acid at equilibrium.
What is chemical equilibrium?Chemical equilibrium is the condition in which no net change in the amounts of reactants and products occurs.
HX(aq) ↔ H+(aq) + X-(aq)
[H+] = [X-]
Ka = [H+] [X-] ÷ [HX]
Hence, Ka = [H+] [X-] ÷ [HX] is the acid dissociation constant for acid at equilibrium.
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K/U_____ /13 T/I______/5
Knowledge and Understanding
1. Complete the following chart: [9 Marks]
Name (1 mark each)
Formula
Type of Compound (Ionic or Molecular) (1/2 mark each)
Diphosphorus Pentoxide
CBr4
Li2O
Silicon Dioxide
CH4 (Write the common name)
Manganese (III) Fluoride
Answer:
it shouuld be the third one down c
Explanation:
why would a metal house not be a good idea in Florida or Alaska?
Answer: Maybe, It could be a good and bad idea.
Explanation:
This is beacuse Metal does not absorb and can block sunlight.
How many moles of methane gas are required when there are 7.55 grams of oxygen gas available? Please someone explain how to solve this problem, I would really appreciate it.
Answer:
0.236 moles of methane gas are required when there are 7.55 grams of oxygen gas available.
Explanation:
The balanced reaction is
CH₄ + 2 O₂ → CO₂ + 2 H₂O
By reaction stoichiometry (that is, the ratio of reactants and products in the reaction), the following amounts of moles of each compound participate in the reaction:
CH₄: 1 mole O₂: 2 moles CO₂: 1 mole H₂O: 2 molesBeing the molar mass of each compound:
CH₄: 16 g/mole O₂: 32 g/moleCO₂: 44 g/mole H₂O: 18 g/moleThen, by reaction stoichiometry, the following mass amounts of each compound participate in the reaction:
CH₄: 1 moles* 16 g/mole= 16 gramsO₂: 2 moles* 32 g/mole= 64 gramsCO₂: 1 mole* 44 g/mole= 44 grams H₂O: 2 moles* 18 g/mole= 36 gramsSo, you can apply the following rule of three: if by reaction stoichiometry 64 grams of oxygen react with 2 moles of methane, 7.55 grams of oxygen react with how many moles of methane?
[tex]moles of methane=\frac{7.55 grams of oxygen*2 moles of methane}{64 grams of oxygen}[/tex]
moles of methane= 0.236
0.236 moles of methane gas are required when there are 7.55 grams of oxygen gas available.
What is one definition of a base?
O A. A substance that increases the hydroxide ions in a solution
B. A substance that forms a salt when it dissolves in water
O C. A substance that stops the flow of electrons when dissolved
O D. A substance that makes the pH of a solution more acidic
Answer:
the answer is A
Explanation:
The base increases Hydroxide ions in a solution e.g NaOH
Answer:
A
Explanation:
If you have 5 moles of carbon dioxide at 30degrees C and under 600mmHg of pressure, what will the volume be
Answer:
157.64 L
Explanation:
We'll begin by converting 30 °C to Kelvin temperature. This can be obtained as follow:
T(K) = T(°C) + 273
T(°C) = 30 °C
T(K) = 30 °C + 273
T (K) = 303 K
Next, we shall convert 600 mmHg to atm. This can be obtained as follow:
760 mmHg = 1 atm
Therefore,
600 mmHg = 600 mmHg × 1 atm / 760 mmHg
600 mmHg = 0.789 atm
Finally, we shall determine the volume of the gas. This can be obtained as follow:
Number of mole (n) = 5 moles
Temperature (T) = 303 K
Pressure (P) = 0.789 atm
Gas constant (R) = 0.0821 atm.L/Kmol
Volume (V) =?
PV = nRT
0.789 × V = 5 × 0.0821 × 303
0.789 × V = 124.3815
Divide both side by 0.789
V = 124.3815 / 0.789
V = 157.64 L
Therefore, the volume of the gas is 157.64 L
A solution with a pOH level of 9.2 would be considered as a basic, acidic, or neutral.
Answer:
It would be Basic.
Explanation:
The higher the number, the more basic it is.
Answer:
its basic solution
Explanation:
b/c the pH value greater than7 base
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3. Components in a heterogeneous mixture are not in the same phase or the composition of the mixture is
a) uniform
b) transparent
c) uneven
4. Mixing sand and salt in water then passing it through a filter separates out the sand because salt
in water and sand does not.
a) reacts
b) dissolves
c) disappears
Answer:
c
Explanation:
Given that the enthalpy of vaporization for water is:
H2O(1) ►H2O(g)
Hvap = + 44.0 kJ/mole
Calculate H for each of the following processes:
a. Evaporating 3.00 moles of water
b. Evaporating 3.00 grams of water
c. Condensing 20.0 grams of water
Answer:h
Explanation:
A given sample of gas has a volume of 5.20 L at 60.°C and 1.00 atm pressure. Calculate its pressure if the volume is changed to 6.00 L and the temperature to 27°C (assume the amount of gas does not change)
Answer:
0.78 atm
Explanation:
Applying general gas equation
PV/T= P'V'/T'................ Equation 1
Where P = initial pressure, T = Initial temperature, V = Initial Volume, P' = Final pressure, V' = Final Volume, T' = Final Temperature.
make P' the subject of the equation
P' = PVT'/TV'.............. Equation 2
From the question,
Given: P = 1.00 atm, V = 5.20 L, T = 60°C = (273+60) = 333K, V' = 6.00 L, T' = 27°C = (27+273)K = 300 K
Substitute these values into equation 2
P' = (1×5.2×300)/(333×6)
P' = 1560/1998
P' = 0.78 atm.
Calculate the [H3O+] of an aqueous solution that is 1.94 x 10-7 Min OH.
Enter your answer in scientific notation. Be sure to answer all parts.
_x 10^_M
plz help me.....im new here
Answer:
Fe2S3
Explanation:
Answer:
Option 3rdFe2S3
Explanation:
As, the ionic valency of Iron (Fe) that is + 3 interchanges with the ionic valency of Sulphide that is - 2 to form-
Fe2S3