Answer:
8.73 × 10²⁴ formula units
Explanation:
To calculate the number of formula units a substance contain, we multiply the number of moles by Avagadro number (6.02 × 10²³)
number of formula units = 14.50 moles × 6.02 × 10²³
= 87.29 × 10²³
= 8.73 × 10²⁴ formula units.
If you want to lower water's freezing point 18 degrees C by adding NaCl, what must the molality of the salt solution be? (K(f) for water ris 1.86 degree C/m)
Answer:
4.84 m
Explanation:
To solve this problem we need Frezing point depression.
Formula is: ΔT = Kf . m . i
ΔT = 18°C
This is data. ΔT is the difference, Freezing T° of pure solute - Freezing T° of solution.
Kf = 1.86 °C/m
m = molality. Our unknown.
i = Ions dissolved in solution, also called Van't Hoff factor.
NaCl → Na⁻ + Cl⁻
Sodium chloride can produce 2 moles of ions.
We replace data: 18°C = 1.86 °C/m . m . 2
18°C / (1.86 °C/m) . 2 = m
molality = 4.84
What is the wavelength of a wave?
Answer:
Wavelength (λ) – The distance of one complete cycle in the wave. The distance between two consecutive crests and /or troughs. S.I. Unit: metre (m).
In other words:
Wavelength is the distance from crest to crest (or trough to trough).
Is this an alpha or beta decay?
The saturation point for a solution is 250 grams of solute per 500 grams of solvent. If you pour 500 grams of
solute into 800. grams of solvent, how many grams of solute are in solution? 3-digit answer only
Answer: 400 g of solute is present in the solution
Explanation:
A solution consists of solute and solvent. A solute is defined as the component that is present in a smaller proportion and solvent is defined as the component that is present in a larger proportion.
Saturation point of a solution is defined as the point after which the solution becomes saturated. This simply means no more solute can be added to the solution.
Mass of solvent = 800 g
At saturation point, 500 g of solvent can dissolve 250 g of solute
Applying unitary method:
800 g of solvent will dissolve = [tex]\frac{250g}{500g}\times 800g=400g[/tex] of solute
Hence, 400 g of solute is present in the solution.
1.9 gm of a gas at 27 0C & 1.1 atm pressure occupies a volume of 1 ltr. The molecular mass of gas is, *
42.5 amu
3.83 amu
44 amu
32.5 amu
Answer:
42.5 amu
Explanation:
Using the ideal gas law equation;
PV = nRT
P = pressure (atm)
V = volume (L)
n = number of moles (mol)
R = gas law constant (0.0821 Latm/molK)
T = temperature (K)
According to the information provided in this question;
mass = 1.9g
T = 27°C = 27 + 273 = 300K
P = 1.1atm
V = 1L
n = ?
PV = nRT
1.1 × 1 = n × 0.0821 × 300
1.1 = 24.63n
n = 1.1/24.63
n = 0.045mol
Mole = mass/molecular mass
0.045 = 1.9/M.M
M.M = 1.9/0.045
M.M = 42.54amu
Isotopes with unstable nuclei are __1__ and are called __2__. The __3__ of radioisotopes decay to __4__nuclei plus emission of large amounts of __5__ . The radiation may be alpha, __6__, or gamma. __7__ radiation consists of alpha particles (positively charged __8__ nuclei) that are easily stopped by a sheet of paper. Beta radiation is composed of fast-moving particles, which are __9__. Beta radiation is more penetrating than alpha radiation; it is stopped by __10__. __11__ radiation is electromagnetic radiation. Gamma radiation has no __12__ or electrical charge. It is extremely penetrating. __13__ bricks and __14__ reduce the intensity of gamma radiation but do not completely __15__ it.
Answer:
Following are the solution to the given question.
Explanation:
Isotopes are radioactive with unstable nuclei, called radioisotopes.Radioisotopes' cores decay into the stable core, with enormous quantities of radiation emissions.It could be either alpha, beta, or gamma.Alpha radiation is made up of alpha particles, that are easy to halt with such a piece of paper.Beta spread spectrum of quickly shifting, electrical electrons.Beta radiation permeates upwards of alpha radiation; metal foil gets halted.Electromagnetic radiation is gamma energy.There is also no electrical or mass radiation. It's also quite insightful.Lead brick and concrete lessen, but just don't stop, the strength of gamma radiation.Answer:
radioisotopes is the answer.
Explanation:
Calculate the Molar Mass of Ba2(CO3)4
O 257
O 197
O 514
Balance the following equation by providing the correct coefficients C2H6 + O2 -> CO2 + H2O
Does the excess reactant get used up completely in a reaction??
Answer:
In a chemical reaction, reactants that are not used up when the reaction is finished are called excess reagents. The reagent that is completely used up or reacted is called the limiting reagent, because its quantity limits the amount of products formed.
Explanation:
define
compound?
covalent
4. What happens to the size of an anion (compared to a neutral atom)? Why?
Calculate the Molar Mass of Radon pentaiodide (Rnls)
857
349
1237
Explanation:
222.01758 g/mol
3.1Computed Properties
PLEASE HELP ASAP - PHOTO ATTACHED
Explanation:
1. 1NH4NO3 = 1N2O+ 2H2O
2. 2k + 2H2O = 1H2 + 2KOH
Which of the following pH numbers are acidic? (Choose 2)
9
11
7
5
3
the pH numbers that are acidic above is 3 and 5
HELP ASAP PLEASE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Answer:
a. alkali
b. chemical
c. reactants
d. neutralised, acid
e. neutralisation
f. products
Explanation:
hope this helps and sorry if it is not right :)
Answer:
a). It is an ----Alkali.
b). ---a chemical reaction takes place.
c).----are the reactants in the reaction.
d).----the alkali has neutralized the acid.
e). --- is called a neutralization
f).---- of the products of the reaction is a salt.
An ideal gas is contained in a cylinder with a volume of 5.0x102 mL at a temperature of 30°C and a pressure of 710. Torr. The gas is then compressed to a volume of 25 mL, and the temperature is raised to 820° C. What is the new pressure of the gas?
Answer:
51207 torr is the new pressure of the gas
Explanation:
We can solve this question using combined gas law that states:
P1V1T2 = P2V2T1
Where P is pressure, V volume and T absolute temperature of 1, initial state and 2, final state of the gas
Computing the values of the problem:
P1 = 710torr
V1 = 5.0x10²mL
T1 = 273.15 + 30°C = 303.15K
P2 = ?
V2 = 25mL
T2 = 273.15 + 820°C = 1093.15K
Replacing:
710torr*5.0x10²mL*1093.15K = P2*25mL*303.15K
3.881x10⁸torr*mL*K = P2 * 7.579x10³mL*K
P2 = 51207 torr is the new pressure of the gas
HELP!! Suppose that the pressure of 1.00 L of gas is 380 mm Hg when the temperature is 200. K. At what
temperature is the volume 2.00 L and the pressure 0.750 atm?
I kilogram mass
Define
Organize the following list of elements from highest to lowest Ionization Energy:
Phosphorus, Bismuth, Arsenic, Antimony, Nitrogen
Answer: The list of elements from highest to lowest Ionization Energy is Nitrogen > Phosphorus > Arsenic > Antimony > Bismuth.
Explanation:
The amount of energy required to remove the most loosely bound electron from an isolated gaseous atom or ion is called ionization energy.
Element with a half-filled orbital requires much more energy to remove an electron. This is because element with a half-filled electronic configuration is the most stable in nature.
More stable or tightly electrons are bound to the nucleus of an atom more will be its ionization energy. This also means that smaller is the atom higher will be its ionization energy.
When we move from top to bottom in a group the size of atom increases and the attraction between nucleus of atom and its valence electrons decreases. Hence, less will be the ionization energy.
Therefore, ionization energy decreases on moving down a group.
So, the given elements Phosphorus, Bismuth, Arsenic, Antimony, Nitrogen are all group 15 elements. Hence, decreasing order of their ionization energy is as follows.
Nitrogen > Phosphorus > Arsenic > Antimony > Bismuth
Thus, we can conclude that the list of elements from highest to lowest Ionization Energy is Nitrogen > Phosphorus > Arsenic > Antimony > Bismuth.
10 points. Please help.
If you have 3 moles of gas at a pressure of 2.5 atmospheres and a volume of 8 liters, what is the temperature? Pay attention to the unit of pressure used.
Answer:
-191.7°C
Explanation:
P . V = n . R . T
That's the Ideal Gases Law. It can be useful to solve the question.
We replace data:
2.5 atm . 8 L = 3 mol . 0.082 L.atm/mol.K . T°
(2.5 atm . 8 L) / (3 mol . 0.082 L.atm/mol.K) = T°
T° = 81.3 K
We convert T° from K to C°
81.3K - 273 = -191.7°C
Answer:
The temperature is 81.3 K.
Explanation:
An ideal gas is a theoretical gas that is considered to be composed of point particles that move randomly and do not interact with each other. Gases in general are ideal when they are at high temperatures and low pressures.
The pressure, P, the temperature, T, and the volume, V, of an ideal gas, are related by a simple formula called the ideal gas law:
P*V = n*R*T
where P is the gas pressure, V is the volume that occupies, T is its temperature, R is the ideal gas constant, and n is the number of moles of the gas. The universal constant of ideal gases R has the same value for all gaseous substances.
In this case:
P= 2.5 atmV= 8 Ln=3 molesR= 0.082 [tex]\frac{atm*L}{mol*K}[/tex]T= ?Replacing:
2.5 atm* 8 L= 3 moles* 0.082 [tex]\frac{atm*L}{mol*K}[/tex] *T
Solving:
[tex]T=\frac{2.5 atm* 8 L}{3 moles* 0.082\frac{atm*L}{mol*K}}[/tex]
T= 81.3 K
The temperature is 81.3 K.
Which is the best example of a compound?
Gold
Ohydrogen peroxide
Air
ocean water
pls asap
Answer:Hydrogen Peroxide or Ocean Water
Explanation:
-H2O2 is compound with 2 elements hydrogen and oxygen.
-Salt water acts as if it were one substance even though it contains two substances salt and water.
-Gold is just an element Au
-Air is just oxygen
Warning eating fish caught in this lake may be dangerous to your health
Answer: it’s C hope that helps
Answer:
hmm I don't think its D because that doesn't have anything to do with your heath I don't think it's C either, probably not global warming so I think its A
Explanation:
I hope that helped :)
sorry if I'm wrong
1. How many times more acidic is Lemon Juice than apples?
5. Pick the list with the correct order of elements according to their reactivity, with the most
reactive metal first to the least reactive metal last.
A. potassium, calcium, sodium, magnesium, aluminum
B. magnesium, calcium, sodium, potassium, aluminum
C. sodium, calcium, potassium, magnesium, aluminum
D. calcium, aluminum, sodium, potassium, magnesium
Answer: do you have the answer for this yet ?
Explanation:
I’m stuck on the same question as well.
what will be observed when a piece of Ag metal is added to a Pb(NO3)2 solution?
What will be observed when a piece of Ca metal is added to a AgNO3 solution?
Answer:
Part a)
No Reaction
Part b)
CaNO3 is formed
Explanation:
Part a)
Silver is less reactive than lead and hence when Ag metal is added to a Pb(NO3)2 solution there will be no reaction
Ag (s) + Pb(NO3)2 (aq) --> Ag (s) + Pb(NO3)2 (aq)
Part b)
Calcium is more reactive than silver and hence when calcium is added to the solution of AgNO3, it will replace Ag from the AgNO3 and itself form compound with NO3 2- ion.
The reaction for the same is
Ca (s) + AgNO3 = CaNO3 + Ag (s)
Per:
Date:
Naming Covalent Molecules Worksheet
as for the following covalent compounds:
tribromide
monosilicide
xide
Answer:
sorry na lilito po ako sa questions eh lilituhin kase ako
Indicate whether the statements are True or False. CHANGE any false ones to make them true! _____ a) At equilibrium the amount of products must equal the amount of reactants. _____ b) During equilibrium, the concentration of the products does not change. _____ c) A collision between reactants is all that is needed to cause a reaction. _____ d) At the beginning of a reaction the forward reaction is faster than the reverse reaction, but then the forward reaction slows down as the reverse reaction speeds up.
Answer:
a. True
b. True
c. True
d. False
Explanation:
At equilibrium condition, the amount of products must be equal to the amount of reactants means 50% of reactant is converted into product and 50% of product is converted into reactant. During equilibrium, the concentration of the products as well as reactant does not change. Yes, a collision between reactants is needed to initiate and complete the reaction. If the concentrations of the reactants are too large, the rate of the forward reaction will be faster than the reverse reaction, and some of the reactants will be converted into products until equilibrium is achieved.
Inyour body what's your systems work together to make sure that oxygen to all the organs of your body?
A. Respiratory and Excretory
B. Circulatory and Respiratory
C. Nervous and Excretory
D. Circulatory and Disgestive
Which of the following is NOT TRUE for both mitosis and meiosis?
a they both preceded by interphase
b. they both split cells thru cytokinesis
c. they divide according to a common pathway
d. they are both involved in the division of somatic cells
Answer:
d. they are both involved in the division of somatic cells
Explanation:
Mitosis and meiosis are both types of cell divisions that occur in the system of living organisms. However, mitosis and meiosis are different in the type and number of daughter cells they give rise to and also where they occur.
Mitosis, which takes place in the SOMATIC OR BODY CELLS of living organisms, give rise to two daughter cells that are genetically identical to their parent cell. On the other hand, meiosis takes place strictly in the CELLS OF REPRODUCTIVE ORGANS, and gives rise to four genetically different daughter cells.
Calculate the volume 3.00 moles of a gas will occupy at 24.0°C and 105.2
kPa,
140. L
35.4L
15.4L
70.4L
Answer:
70.34 litres
Explanation:
Using ideal gas law equation;
PV = nRT
Where;
P = pressure (atm)
V = volume (L)
n = number of moles (mol)
R = gas law constant (0.0821 Latm/molK)
T = temperature (K)
According to the information given in the question;
n = 3 moles
V = ?
P = 105.2 KPa = 105.2/101 = 1.04atm
T = 24.0°C = 24 + 273 = 297K
Using PV = nRT
1.04 × V = 3 × 0.0821 × 297
1.04V = 73.15
V = 73.15 ÷ 1.04
V = 70.34 litres.