Answer:
Explanation:
living
divide
Cuantas moléculas de K² Cr ² 0⁷ hay en 0.5 dm³ de una solución de dicromoto de potasios de 30% en p/p y una densidad relativo de 1.15? (Coronel R., 2018)
Answer:
El número de moléculas de K₂Cr₂O₇ presentes en la solución es de aproximadamente 3,52058347 × 10²³ moléculas
Explanation:
Los parámetros dados de la solución de dicromato de potasio son;
El volumen de la solución, V = 0,5 dm³ = 0,0005 m³
El porcentaje en masa de dicromato de potasio en la solución = 30% p / p
La densidad relativa de la solución, RD = 1,15
Por lo tanto, la masa de dicromato de potasio en la solución, m = 30% de la masa de la solución.
El RD de la solución = (La densidad de la solución) / (La densidad del agua)
La densidad del agua = 997 kg / m³
Por lo tanto, tenemos;
RD = 1,15 = (La densidad de la solución) / (997 kg / m³)
La densidad de la solución, ρ = 1,15 × 997 kg / m³ = 1,146,55 kg / m³
La masa de la solución, m = ρ × V
∴ m = 1.146,55 kg / m³ × 0.0005 m³ = 0,573275 kg
La masa de dicromato de potasio en la solución, m₁ = 0.3 × m
∴ m₁ = 0.3 × 0.573275 kg = 0.1719825 kg = 171.9825 g
La masa de dicromato de potasio en la solución, m₁ = 171,9825 g
La masa molar del dicromato de potasio, K₂Cr₂O₇ = 294,185 g / mol
El número de moles de dicromato de potasio, K₂Cr₂O₇ en la solución, n = (Masa, m) / (Masa molar)
∴ n = 171,9825 g / (294,185 g / mol) = 0,584606625 moles
∴ El número de moléculas de K₂Cr₂O₇ presentes en la solución = n ×
Dónde;
= Número de Avogadro = 6.0221409 × 10²³ mol⁻¹
Por lo tanto, tenemos;
El número de moléculas de K₂Cr₂O₇ presentes en la solución = 0.584606625 moles × 6.0221409 × 10²³ mol⁻¹ = 3.52058347 × 10²³ moléculas
El número de moléculas de K₂Cr₂O₇ presentes en la solución ≈ 3.52058347 × 10²³ moléculas
Question 10 (4 points)
A 3.4 L balloon is let go near the surface of the Earth where the pressure is about 1.15 atm. As the balloon floats up to the top of the
atmosphere where the pressure is only about 0.35 atm it expands. What is the volume of the balloon at the top of the atmosphere?
3) Calculate the net force *
3N
5N
Answer:
2N
Explanation:
since they are going both sides you subtract
For each of the following solutions, state whether the solution is saturated, unsaturated or supersaturated in the following conditions:
A) at 30o C, 70 g of KNO3 is dissolved in 100 g of water ________________________________
B) at 20 oC 0 g of KClO3 is dissolved in 100 g water________________________________
C) at 100 oC , 30 g of NaNO3 is dissolved in 100 g of water_____________________________
D) 50 g of NH4Cl at 70o C is dissolved in 100 g water. ________________________________
Answer:
C.at 100•C.30 g of NaNO3 is dissolved in 100 g of water
I need help with my science vocabulary!!! Please help!
Answer:
1. B
2. E
3. A
4. D
5. C
~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Hope I helped!!!
GL :)
If 5.50 mol of a gas occupies 230 L at constant temperature and pressure, how many moles are there if the volume is decreased to 176 L?
Answer:
4.21 moles are the moles of the gas when the volume decreases
Explanation:
Based on Avogadro's law, the moles of a gas are proportional to its volume under pressure and temperature constants. The formula is:
[tex]\frac{V_1}{n_1} =\frac{V_2}{n_2}[/tex]
Where V₁ is initial volume (230L)
n₁ is initial moles (5.50mol)
V₂ is final pressure (176L)
And n₂ are final moles:
176L * 5.50mol / 230L = n₂ =
4.21 moles are the moles of the gas when the volume decreasesWhat is the answer to:
5.67 in x 23.321in
Answer:
132.23007
Explanation:
The work done on a machine, the product of the input force and the distance through which the force is exerted.
A- Work, input
B- Work, output
C- Mechanical Advantage
D- Power
Please help me ASAP :(
Hydrogen-3 has a half-life of 12.32 years. It decays into helium-3. Suppose a
sample contains 6 atoms of hydrogen-3 and 18 atoms of helium-3. About
how old is the sample?
A. 12.32 years
B. 49.28 years
C. 36.96 years
D. 24.64 years
Answer:
24.64
Explanation:
Just took the test.
A chemical reaction at equilibrium always has _______.
A. A forward reaction rate that equals the reverse reaction rate.
B. A high Keq value.
C. Equal concentrations of reactants and products.
D. Zero energy
Answer:
A
Explanation:
NH₃ + _O₂ → _N₂ + _H₂O
Answer:
4NH3 + 3O2 → 2N2 + 6H2O
Explanation:
You took a summer job at a restaurant. Your boss wants you to mop the bathroom and kitchen floors before you leave tonight. She hands you an unmarked white jug that is filled with a watery clear liquid. What are three things you should do before you mop the floor?
can someone help me with this?
Answer:
165.27 K
Explanation:
Initial Temperature, T1 = 303K
Initial Pressure P1 = 3.3 atm
Final Pressure P2 = 1.8 atm
Final Temperature T2 = ?
Using the equation
P1 / T1 = P2 / T2
3.3 / 303 = 1.8 / T2
T2 = 1.8 * 303 / 3.3
T2 = 165.27 K
Name 3 parts of an atom
Answer:
the three parts are protons, neutrons, and electrons
Explanation:
have a good day
Explain how water is able to control fire.
Answer ASAP
Plzz
Answer: Fire requires oxygen to burn. Water "smothers" fire and prevents it from acquiring more oxygen. Fire also requires heat, which cool water may prevent/remove.
Answer:
See what happens is the water bender uses the water to control the fire by... jp lol
Explanation:
Real answer is the water puts out the fire because it is a non-combustible aqueous solution, therefore it's able to be used to control a fire.
Why does air with higher amounts of water vapor have a lighter density?
Answer:
moist air is less dense than dry air because water has a lower molecular weight than nitrogen and oxygen
Answer:
Water vapor is a relatively light gas when compared to diatomic Oxygen and diatomic Nitrogen. Thus, when water vapor increases, the amount of Oxygen and Nitrogen decrease per unit volume and thus density decreases because mass is decreasing.
What do you already know about the structure of a water molecule?
Answer:
The key to understanding water's chemical behavior is its molecular structure. A water molecule consists of two hydrogen atoms bonded to an oxygen atom, and its overall structure is bent. This is because the oxygen atom, in addition to forming bonds with the hydrogen atoms, also carries two pairs of unshared electrons
Explanation:
Hope it helps
There are the same number of atoms in a mole of calcium (Ca) than in a
mole of helium (He).
True
False
Answer:
True
Explanation:
A mole is defined as a certain amount of a unit. Such as atoms or molecules.
How many moles of oxygen are required to use up 2 moles of propane?
Answer:
6.0 moles
Explanation:
The thing to remember about balanced chemical equations is that the stoichiometric coefficients added to each chemical species that takes part in the reaction are equivalent to moles.
I think its 10 moles, hope this helps.
Describe the relationship between thermal energy and temperature of a substance.
help me pls :D
.4.2 moles of copper would contain how many grams of copper?
Answer:
0.015736631731344 mole
Explanation:
You can view more details on each measurement unit: molecular weight of Copper or mol The molecular formula for Copper is Cu. The SI base unit for amount of substance is the mole. 1 grams Copper is equal to 0.015736631731344 mole.
What makes up soil and where do these main components come
from? ASAP
Answer:
Soil is a mixture of minerals, dead and living organisms (organic materials), air, and water.
Explanation:
Dead organisms decompose(kind of like fertilizer)
water comes from nearby watersheds, precipitation processes, etc.
Answer:
Soil is made up of three main components – minerals that come from rocks below or nearby, organic matter which is the remains of plants and animals that use the soil, and the living organisms that reside in the soil. The proportion of each of these is important in determining the type of soil that is present.
(4.03 Q1) What is a substance which cannot be broken down into different
substances?
an element
a compound
a sugar
Answer:
An element
Elements are substances that cannot be broken down into simpler substances either by physical or chemical method.
Please help!!!!!!!!!!!!!
Suppose you found this bright purple mineral how would you describe its luster
Answer:
mineral
Explanation:
The relative formula mass of a compound with formula XS0, is 120. Calculate the ralative
atomic mass of Y.
[Relative atomic mass: S, 32; 0, 16]
Answer:
72
Explanation:
Relative atomic mass of YSO = Relative atomic masses of Y + S + O
This implies; Y + 32 + 16 = 120
Y = 120 - 48
Y = 72
Hence, the relative atomic mass of Y = 72
According to the kinetic-molecular theory, what happens to a liquid when it is transferred from one container to
another?
A) The volume and the shape stay the same.
B) The volume increases to fill the new container, but the shape stays the same.
C) The volume stays the same, but the shape changes to fit the new container.
D)The volume and the shape change to fill the new container.
Answer:
C) The volume stays the same, but the shape changes to fit the new container.
Explanation:
The tablet has a mass of 1.20 g and contains 700 mg of lithium carbonate.
Calculate the percentage by mass of lithium carbonate in this tablet.
Answer:
The right answer is "58.3%".
Explanation:
The given values are:
Mass of lithium carbonate,
= 700 mg
i.e.,
= 0.7 g
Mass of tablet,
= 1.20 g
Now,
The percentage of active ingredient will be:
= [tex]\frac{Mass \ of lithium \ carbonate}{Mass \ of \ tablet}\times 100[/tex]
On substituting the given values, we get
= [tex]\frac{0.7}{1.20}\times 100[/tex]
= [tex]0.583\times 100[/tex]
= [tex]58.3[/tex]%
Write dissociation equations to describe what would occur when each of the following ionic compounds dissolve in water.
a. NaBr
b. K2SO4
c. Pb(C2H3O2)2
d. NH4NO3
e. LiI
f. HCl
I have an irregular object that I want to find the density of. I put it in a graduated cylinder and the water rises by 12 mL. I put the object on a scale and it measures 42 g. What is the density of the object?
Answer:
12
Explanation: