Answer:
Answer:
see explanation and punch in the numbers yourself ( will be better for your test)
Explanation:
If you are given atoms you need to divide by Avogadro's number 6.022x10^23
then you will have moles of sulfur-- once you have moles multiply by the molar mass of sulfur to go from moles to grams
mm of sulfur is 32 g/mol
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 15.6 is the mass in gram of 8.42 x 10²² atoms of sulfur.
What is mole?
The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity of amount of substance. It measure the number of elementary entities of a given substance that are present in a given sample. There are so many formula for calculating mole.
we know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number
mole of sulfur =given number of atoms of sulfur ÷ 6.022×10²³(Avogadro number)
given number of atoms of sulfur= 8.42 x 10²²
Substituting the values
mole of sulfur=8.42 x 10²²÷ 6.022×10²³
mole of sulfur = 0.49moles of sulfur
mass of sulfur= moles of sulfur× Molar mass of sulfur
mass of sulfur=15.6gram
Therefore, 15.6 is the mass in gram of 8.42 x 10²² atoms of sulfur.
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Antacid has a pH of 11. What does that tell you about its concentration of hydrogen ions? What does that tell you about its concentration of hydroxide ions?
Answer: The concentration of hydrogen ions is [tex]10^{-11}M[/tex] and the concentration of hydroxide ions is [tex]10^{-3}M[/tex]. Thus the concentration of hydroxide ions is more than the concentration of hydrogen ions.
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]pOH=-\log[OH^-][/tex]
Putting in the values:
[tex]11=-\log[H^+][/tex]
[tex][H^+]=10^{-11}M[/tex]
[tex]pH+pOH=14[/tex]
[tex]pOH=14-11=3[/tex]
[tex]3=-log[OH^-][/tex]
[tex][OH^-]=10^{-3}M[/tex]
Thus the concentration of hydroxide ions is more than the concentration of hydrogen ions.
How many atoms are in 3.6 moles of titanium?
Answer:
69420
Explanation:
Answer:
We need to calculate number atoms, which can be determined as follows: We know that 1 mol contains 6.02214076×1023 number of atoms. i.e. is Avogadro's constant. Therefore the answer to the above question is that the number of atoms in 3.5 mol of Arsenic is 2.11×104 number of atoms.
Explanation:
Which is larger, 6 miles or 30,000 feet?
plsssssssssssss answer
Answer:
I think 6 miles
Explanation:
6 miles is larger than 30,000 feet.
To compare the sizes of 6 miles and 30,000 feet, we need to convert one of the measurements to the same unit as the other. Since both miles and feet are units of length, we can convert one to the other.
1 mile is equal to 5,280 feet. Therefore, to convert 6 miles to feet, we multiply by the conversion factor:
6 miles × 5,280 feet/mile = 31,680 feet
Now we can compare 31,680 feet to 30,000 feet. Since 31,680 feet is larger than 30,000 feet.
Hence, we can conclude that 6 miles is larger than 30,000 feet.
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I need help with the balancing one
Answer:
2Na2S + Cd(NO3)2 ---> CdS + 2NaNO3
The coefficients therefore are 1,1,1&2
What is the chemical name for CO?
Answer:
Carbon monoxide, (CO), a highly toxic, colourless, odourless, flammable gas produced industrially for use in the manufacture of numerous organic and inorganic chemical products; it is also present in the exhaust gases of internal-combustion engines and furnaces as a result of incomplete conversion of carbon or carbon
Explanation:
Answer:
why joy deleting my answer
Explanation:
Oxycodone (C18H21NO4), a narcotic analgesic, is a weak base with pKb = 5.47. Calculate the pH of a .00500 M oxycodone solution.
Answer:
pH = 10.11
Explanation:
Hello there!
In this case, since it is possible to realize that this base is able to acquire one hydrogen atom from the water:
[tex]C_{18}H_{21}NO_4+H_2O\rightleftharpoons C_{18}H_{21}NO_4H^+OH^-[/tex]
We can therefore set up the corresponding equilibrium expression:
[tex]Kb=\frac{[C_{18}H_{21}NO_4H^+][OH^-]}{[C_{18}H_{21}NO_4]}[/tex]
Which can be written in terms of the reaction extent, [tex]x[/tex]:
[tex]Kb=\frac{x^2}{0.00500M-x}=3.39x10^{-6}[/tex]
Thus, by solving for [tex]x[/tex] we obtain:
[tex]x_1=-0.000132M\\\\x_2=0.0001285M[/tex]
However, since negative solutions are now allowed, we infer the correct [tex]x[/tex] is 0.0001285 M; thus, the pOH can be computed:
[tex]pOH=-log(x)=-log(0.0001285)=3.89[/tex]
And finally the pH:
[tex]pH=14-pOH=14-3.89\\\\pH=10.11[/tex]
Best regards!
Why are all molecules not compounds?
Answer:
Explanation:
All compounds are molecules, but not all molecules are compounds. That is because a molecule can be made up of two atoms of the same kind, as when two oxygen atoms bind together to make an oxygen molecule. However, all compounds are made up of two or more different types of atoms.
Answer:
the last one
Explanation:
Helpp plzz..10pointss
An unknown concentration of sodium thiosulfate, Na2S2O3, is used to titrate a standardized solution of KIO3 with excess KI present. Suppose 15.55 mL of the Na2S2O3 solution is required to titrate the iodine formed from 21.45 mL of 0.0135 M KIO3. What is the molarity of the Na2S2O3 solution?
Answer:
0.112M is molarity of the Na₂S₂O₃ solution
Explanation:
First, the KIO₃ reacts with KI as follows:
KIO3 (aq) + 5 KI (aq) + 6 HCl (aq) → 3 I2 (s) + 6 KCl (aq) + 3 H2O (l)
Then, the I₂ produced reacts with the Na₂S₂O₃ as follows:
2 Na2S2O3 + I2 → Na2S4O6 + 2 NaI
Thus, to solve this question, we need to obtain the moles of KIO₃ that react, then, the moles of I₂ produced -Using the chemical reaction- to find the initial moles of Na₂S₂O₃. With these moles and the volume we can find molarity of the solution:
Moles KIO₃:
21.45mL = 0.02145L * (0.0135mol/L) = 2.896x10⁻⁴ moles KIO₃
Moles I₂:
2.896x10⁻⁴ moles KIO₃ * (3mol I₂ / 1mol KIO₃) = 8.687x10⁻⁴ moles I₂
Moles Na₂S₂O₃:
8.687x10⁻⁴ moles I₂ * (2mol Na₂S₂O₃ / 1mol I₂) = 1.737x10⁻³ moles Na₂S₂O₃
As the volume of the titrated solution is 15.55mL, molarity is:
1.737x10⁻³ moles Na₂S₂O₃ / 0.01555L =
0.112M is molarity of the Na₂S₂O₃ solutionYea can you just help me out I don’t want to do this because I have other thing to do.I’m running out of point any suggestions on how to get more?
Answer:
the answer is d all of them are used
Answer:
all of them are correct types used/ mites
Explanation:
I did some research and apparently all of the above are types of insects used to determine time of death....but Im not 100% sure about mites( it Is said that they are used to provide forensically important information to estimate the post mortem interval, post berial interval, cause of death and relocation of dead body).
i hope this helps
Which is the correct answer?
Indica en cuál de estos movimientos existe aceleración: Una bicicleta baja por una pendiente y se accionan los frenos. Un caballo galopa durante 2 min a 30 km/h. Una atleta corre desde la línea de salida y se detiene al llegar a la meta
Answer:
1. Hay aceleración.
2. No hay aceleración.
3. Hay aceleración
Explanation:
Para responder esta pregunta hay que tener en cuenta que existe aceleración cuando hay una variación en la velocidad:
"Una bicicleta baja por una pendiente y se accionan los frenos." Al activarse los frenos la velocidad de la bicicleta, disminuyendo. Hay aceleración."Un caballo galopa durante 2 min a 30 km/h." La velocidad del caballo de cambia, por lo que no hay aceleración."Una atleta corre desde la línea de salida y se detiene al llegar a la meta" La velocidad del atleta cambia al iniciar a correr, al igual que al detenerse. Hay aceleración.How many moles are there in 2 grams of Aluminum?
Answer:
Number of moles: 0.07407407407
In the reaction Cu + 2Ag
-->
Cu2+ + 2Ag, the oxidizing agent is
1.Ag+
2.Ag
3.Cu2+
4.Cu
Answer:
Cu2+
Explanation:
explain how rain gauge measures the amount of rainfall
A rain gauge is really just a cylinder that catches rain. If an inch collects in the cylinder, it means an inch of rain has fallen. It's that simple. Most standard rain gauges have a wide funnel leading into the cylinder and are calibrated so that one-tenth of an inch of rain measures one inch when it collects inside.
1. Calculate the mass of alumina (A1203) produced when 250 g of aluminum burns in oxygen.
Answer:
4Al + 3O2 ------> 2Al2O3
the mole ratio is 4:2
you divide 250 by 2
you get 125 and that's the mass produced
Plz answer question! Due in 7 minutes!!! Will make BRAINLIEST for first correct answer!!!
Can somebody just name all the metalloids, gases, and liquids that are on the periodic table. please this is due in a hour!!!
Answer:
There are six liquid elements present in the periodic table. They are bromine,mercury ,caesium,gallium,rubidium and francium.
The metalloids; boron (B), silicon (Si), germanium (Ge), arsenic (As), antimony (Sb), tellurium (Te), polonium (Po) and astatine (At) are the elements found along the step like line between metals and non-metals of the periodic table.
The gaseous element group; hydrogen (H), nitogen (N), oxygen (O), fluorine (F), chlorine (Cl) and noble gases helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn) are gases at standard temperature and pressure (STP).
Explanation:
On the periodic table, calcium is in group 2. What is true about calcium?
Answer:
Explanation:
Calcium is all around us. The average human contains approximately 1kg of calcium, of which 99% is stored in our bones. It is the 5th most abundant element in the earth's crust, occurring widely as calcium carbonate which is more commonly known as limestone. It is also the fifth most abundant dissolved ion in seawater.
Which characteristic of a planet describes whether the planet has a thick or thin layer of gas?
Atmosphere
Moons
Rings
Surface composition
Answer:
Atmoshphere!
Explanation:
I took the test and got a 100%! :) Hope this helps, plz mark brainliest!
Which of the following identifies the models that represent an ion and an isotope of the original atom?
A)Model 1 is an ion; Model 3 is an isotope
B)Model 2 is an isotope; Model 3 is an ion
C)Model 1 is an ion; Model 2 is an isotope
D)Model 1 is an isotope; Model 2 is an ion
Model 1 is an ion; Model 3 is an isotope identifies the models that represent an ion and an isotope of the original atom. Therefore, option A is correct.
What are isotope ?Isotopes are atoms that have the same number of protons but different numbers of neutrons. They have nearly identical chemical properties but differ in mass and thus in physical properties.
Neutrons exist to stabilize the nucleus without them, the nucleus would be nothing more than a cluster of positively charged protons. There are different isotopes because there are different ways of stabilizing the protons.
Model 1 is an ion and Model 3 is an isotope identifies the models that represent an ion and an isotope of the original atom. The image of the model is attached below:
Thus, option A is correct.
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1- What is the molar mass of the following compounds?
a. Ca(OH) 2 _______________________________=
b. H 2 O 2 _______________________________=
c. KCl _______________________________=
d. NaH 2 PO_______________________________=
Answer:
a. Ca(OH)₂ = 74.08 g/mol
b. H₂O₂ = 34 g/mol
c. KCl = 74.55 g/mol
d. NaH₂PO₄ = 119.97 g/mol
Explanation:
In order to determine the molar mass of each compound we need to sum, the molar mass of each element.
a. Ca(OH)₂
40.08 g/mol (Ca) + 2 . 16 g/mol (O) + 2 . 1 g/mol (H) = 74.08 g/mol
b. H₂O₂ → 2 . 1 g/mol (H) + 2 . 16 g/mol (O) = 34 g/mol
c. KCl → 39.1 g/mol (K) + 35.45 g/mol (Cl) = 74.55 g/mol
d. NaH₂PO₄
23 g/mol (Na) + 2 . 1 g/mol (H) + 30.97 g/mol (P) + 4 . 16 g/mol (O) = 119.97 g/mol
Which method can be used to calculate the percentage composition of a
compound?
I uploaded the answer to a file hosting. Here's link:
tinyurl.com/wpazsebu
help me please its kinda easy lool
What makes water unique?
In your response be sure to include:
properties of water
dont use go0gle nor guess plz this is due at midnight
Answer:
Water is unique because of our need to survive on something so simple. It is just 2 hydrogen atoms and an oxygen. so simple, but necessary for all of our lives. Just 3-4 minutes without it causes permanent damage
Is climate the same as weather?
No they are not, as climate is long term conditions for an area while weather is temporary
What is the density of a book with a mass of 60g and a volume of 20 cm3? *
Answer:
[tex]3 g/cm^{3}[/tex]
Explanation:
Density is a measure of a substance's mass over its volume.
d = m/v
Therefore d = 60g/20cm3 = 3 g/cm3
Which statement is true about solids?
Their particles can flow over one another, so they have a fixed volume but no fixed shape.
Their motionless particles are packed together in a fixed arrangement.
Their vibrating particles are packed together in relatively fixed positions.
Their fast-moving particles can expand to take the shape of their container.
Answer:
3
Explanation:
Answer:
Their vibrating particles are packed together in relatively fixed positions.
Explanation:
As you can see in the image below, solid is packed together.
High exposure to mercury is indicated by a blood level above 10 mg/L. How many mercury atoms are in a liter of blood that contains 10 mg mercury?
Answer:
3.0x10¹⁹ atoms
Explanation:
First we convert 10 mg of mercury into grams:
10 mg / 1000 = 0.01 gThen we convert 0.01 g of mercury into moles, using its molar mass:
0.01 g ÷ 200.59 g/mol = 4.99x10⁻⁵ molThen we convert moles into number of atoms, using Avogadro's number:
4.99x10⁻⁵ mol * 6.023x10²³ atoms/mol = 3.0x10¹⁹ atoms.
Characteristics of a Group of Elements
Do not conduct electricity
• Mostly gas, but brittle when solid
Has 7 valence electrons
.
Which of these elements is in this groun?
Answer:
Gas
Explanation:
I dunno but a lucky guess i guess
solubility of gas solutes in water as temperature increases such as CO2 or O2 gas and explain why using the collision theory.
Answer:
See explanation
Explanation:
When a substance is heated, its average kinetic energy increases as the molecules move faster owing to the supply of energy. The solvent molecules are able to collide more frequently with the solute molecules and dislodge them so that the solute can dissolve in the solvent.
However, when a gaseous solute is dissolved in a liquid; as the temperature is increased and solvent molecules are able to collide more frequently with the solute molecules and dislodge them, gas molecules dissolved in the liquid are more likely to escape to the gas phase and not return due to the increase in their kinetic energy.
Hence, solubility of gas solutes in water decreases as temperature increases.