Answer:
The answer is "Option B"
Explanation:
Formula:
Na atoms= Na atoms moles \times NA
[tex]= \frac{mass}{Na \ Molar\ mass} \times 6.022 \times 10^{23}\\\\= \frac{9.2}{23} \times 6.022 \times 10^{23}\\\\=0.2875 \times 6.022 \times 10^{23}\\\\=2.4 \times 10^{23}\ atoms \\\\[/tex]
A 45.0 cm3 sample of gas is heated from 280. K to 315 K. What is the new volume of the gas sample?
Answer:
50.63 cm³
Explanation:
Using Charles law equation as follows:
V1/T1 = V2/T2
Where;
V1 = initial volume (cm³)
V2 = final volume (cm³)
T1 = initial temperature (K)
T2 = final temperature (K)
According to the question, V1 = 45.0 cm³, V2 = ?, T1 = 280 K, T2 = 315 K
Using; V1/T1 = V2/T2
45/280 = V2/315
Cross multiply
45 × 315 = 280 × V2
14175 = 280V2
V2 = 14175 ÷ 280
V2 = 50.625
V2 = 50.63 cm³
WILL GIVE BRAINLIEST!!!
What is the mass of NaCl required to make 160 grams of a 32% solution of NaCl in water?
Answer:
19.20 g. Explanation: ∵ mass % = [mass of solute/mass of solution] x 100
A process used to gain knowledge through observation and investigation is?
science
math
physics
energy
matter
Answer:matter
Explanation:
matter
make brain
How many atoms are in an oxygen molecule?
Answer:
two atoms
Explanation:
In its stable molecular form, oxygen exists as two atoms and is written O2. to distinguish it from an atom of oxygen O, or ozone, a molecule of three oxygen atoms, O3. Even though each of these is all oxygen, combining atoms of the same element may give very different properties to the molecule.
Mr. Romeo wants to make a solution of NaOH. He measures out 97.68 grams and puts it into 3 liters
What is the molarity of the solution he created? Round to 2 Decimal points
Answer: Molarity of the solution is 0.813 M.
Explanation:
Given : Mass of NaOH = 97.68 g
Volume of solution = 3 L
The molar mass of NaOH is 39.99 g/mol. Hence, moles of NaOH are calculated as follows.
[tex]No. of moles = \frac{mass}{molar mass}\\= \frac{97.68 g}{39.99 g/mol}\\= 2.44 mol[/tex]
Molarity is the number of moles of solute present in a liter of solution. Therefore, molarity of given solution is calculated as follows.
[tex]Molarity = \frac{no. of moles of solute}{Volume (in L)}\\= \frac{2.44 mol}{3 L}\\= 0.813 M[/tex]
Thus, we can conclude that molarity of the solution is 0.813 M.
Molar mass of 500g of Cl2
Explanation:
What's Your Question ??..
Identify the gas law that applies to the following scenario: A 36.5 liter balloon holding 2.9 moles of carbon dioxide leaks. If we are able to determine that 1.2
moles of carbon dioxide escaped before the container could be sealed, what is the new volume of the container?
O Boyle's Law
Charles Law
Gay-Lussac's Law
Avogadro's Law
Answer:
Avogadro's Law
Explanation:
The amount of moles is directly proportional to the volume of the gas under constant temperature and pressure. That is the statement of Avogadro's law. The equation is:
V1n2 = V2n1
Where V is volume and n are moles of 1, initial state and 2, final state of the gas
That means, right option is:
Avogadro's LawHow many moles of calcium oxide are formed when 3 moles of calcium react with oxygen?
Answer:
3 moles of CaO
Explanation:
The chemical balanced equation is;
2Ca + O₂ → 2CaO
The ratio of calcium(Ca) to Calcium Oxide(Cao) in this equation is 2:2.
Now, when 3 moles of calcium react with oxygen, Cao produced will be;
3 moles of O₂ × 2 moles of CaO/2 moles of Cao = 3 moles of CaO
The half life of tritium is 12.3 years. How much sample will remain if you start with 425g of tritium that is found after 4 half lives?
Answer:
26.56g
Explanation:
The half life of an isotope decay is the time transcurred when the initial amount of the isotope decays to the half of its amount.
For the problem, when 1 half life transcur, the sample has a mass of:
425g / 2 = 212.5g
When 2 half lives transcur:
212.5g / 2 = 106.25g
3 half lives:
106.25/2 = 53.13g
And the amount that is found after 4 half lives is:
53.13/2 =
26.56gGiven the data table below, which metal will take the least amount of
energy to increase its temperature?
metal. c(j/gk)
Al. 0.921
Ba. 0.201
Mg. 1.04
Ni. 0.502
K. 0.754
Answer:
Barium
Explanation:
The specific heat of a material is a property defined as the amount of energy required to increase the temperature of 1g of this material in 1°C = 1K
In this way, the metal that takes the least amount of energy to increase its temperature is the metal that has the lowest specific heat.
In the problem, this metal is Barium (Ba = 0.201J/gK)
3 miles of NaCl in 12 liters of water
What is the molarity
Answer:
[tex]12 \: litres \: contain \: 3 \: \: moles \: of \: sodium \: chloride \\ 1 \: litre \: will \: contain \: \frac{(1 \times 3)}{12} moles \\ = 0.25 \: mol \: {l}^{ - 1} [/tex]
Explanation:
[tex]12 \: litres \: contain \: 3 \: \: moles \: of \: sodium \: chloride \\ 1 \: litre \: will \: contain \: \frac{(1 \times 3)}{12} moles \\ = 0.25 \: mol \: {l}^{ - 1} \\ or : 0.25 \: M[/tex]
Make a list of all the possible human sources of carbon dioxide. Giving brainliest
topic:
surface area
(multiple choice)
irrelevant answers will be reported
what is the name of the chemical used for bleach in sugar industries
Answer: I think Sulfur dioxide
Explanation: sulfur dioxide is highly known as a bleaching agent in chemical factories during chemical processes and production
I am not to sure about bleaching in the SUGAR FACTORIES but if u need more explanation about sulfur dioxide in bleaching feel free to COMMENT!!!
Escaping from the haunted house, Anna ran home immediately to her chemistry lab
back at the high school. After analysis of the gold heart, she found the heart was not
composed of pure gold, but gold (III) oxide (Au203). What percentage (by mass) was
gold in the heart?
a) 10.9% Au
C) 89.1% Au
b) 81.2% Au
d) 92.9% Au
Why must a special saw be used when removing a cast?
A. Because it is very painful to have a cast removed.
B. Because a cast is made of material that requires a special saw.
C. Because a regular saw is not strong enough to cut the cast.
D. Because a regular saw might cut a person’s skin.
How much heat is absorbed if a 30.0 gram sample of carbon is heated from 10.5 degrees Celsius to 22.2 degrees celsius
Answer:
A lot of heat
Explanation:
Write the Keq for the dissolving of salt: NaCl → Na+ + Cl-.
The equilibrium constant of this reaction can be called the solubility product and is written as; Ksp = [Na^+] [Cl^-]
What is equilibrium constant?The term equilibrium constant refers to the number that shows the extent to which reactants are converted into products.
In this case, the equilibrium constant of this reaction can be called the solubility product and is written as; Ksp = [Na^+] [Cl^-]
Learn more about equilibrium constant:https://brainly.com/question/10038290
#SPJ2
What property of ocean water affects climate the most?
O A. Its salt content
B. Its density
O C. Its heat capacity
O D. Its freezing point
Answer:
c
Explanation:
Which of the following organs produce enzymes that help chemical digestion happen?
A liver
B small intestine
C large intestine
D rectum
Answer:
A liver
B small intestine
What is the systematic name of the following compound?
CaF 2
answer asap pls i give brainliest
Answer:
B. Revolution is a planet's movement around the sun causing four seasons the occur. Rotation is the spinning of the planet on its axis causing day and night.
aluminum oxide solube or insolube
Answer:
Reaction with water: Aluminum oxide is insoluble in water and does not react like sodium oxide and magnesium oxide.
How do you write the formula for the combination of 2 chemicals?
example: al3+, br1-, and o2- combined would be what?
Explanation:
[tex]Al(Br)O _{3} \\ name \: = > \: aluminiummonobromo(iii)oxide[/tex]
if i put regular air into a ziplock bag does carbon dioxide come out?
Which feature causes a gap in the geologic record?
extrusion
fault
o intrusion
erosion
Answer:
Hi, there the answer is
A)extrusion
Explanation:
The feature that causes a gap in the geologic record is called extrusion.
What is extrusion in geologic record?Sometimes magma can force itself through a crack or fault in the rock at the Earth's surface. It pours out over the Earth's surface in a volcanic eruption. This process is called extrusion. The rocks that form from extruded magma are called extrusive igneous rocks.
Direct Extrusion, Indirect Extrusion, Hydrostatic Extrusion and Lateral or Vertical Extrusion are some types of extrusion.
Lava that hardens on the surface is called an extrusion. The rock layers below an extrusion are always older than the extrusion. Beneath the surface, magma may push into bodies of rock. There, the magma cools and hardens into a mass of igneous rock called an intrusion.
Therefore, The feature that causes a gap in the geologic record is called extrusion.
Learn more about extrusion, here:
https://brainly.com/question/30554658
#SPJ5
What should be the labels on the X-axis and Y-axis?
Answer Is Any Real Numbers, Such As 6,15,21.
PLEASE HELP DUE IN 20 MINUTES Find the empirical formula for the following problem. Remember to show your work if you want
to earn credit.
1. One mole of an unknown compound has 36.0 g of carbon and 6.0 g of hydrogen. What
is the empirical formula of the unknown compound? (Hint: You will want to reduce to find
the empirical formula)
Given: Carbon: 36.0 grams
1 mol C = 12.0 g
Hydrogen: 6.0 g
1 mol H = 1.0 g
Unknown: empirical formula
Solve:
Answer:
CH2
Explanation:
The empirical formula is the simplest formula of a chemical compound. It shows the ratio in which constituent atoms are combined in the compound.
To obtain the empirical formula, we divide the given mass of each element by the relative atomic mass of that element.
C- 36.0 g/12.0 g H- 6.0g/1.0g
C- 3 H-6
Divide through by the lowest ratio;
C-3/3 H- 6/3
C-1 H-2
Hence the empirical formula of the compound is
CH2
The area of a circle is 38.5 cm². Calculate.
(a) the radius
The Answer is 3.501591994
Explanation:
area of circle = πr^2
radius=
39.5 = 22/7*r^2
r^2 = 7*39.5/22
= 12.56
r=3.5
A una mezcla de 300g, formada con 60% P/P de Hierro y 40% P/P de Arena, se le adicionan 135g de Cobre y 2,77g de Aluminio. ¿Cuál es la concentración final P/P de cada uno de los componentes?
Answer:
[tex]\%P/P_{hierro}=41.1\%\\\\\%P/P_{arena}=24.4\%\\\\\%P/P_{cobre}=30.8\%\\\\\%P/P_{aluminio}=0.6\%[/tex]
Explanation:
¡Hola!
En este caso, dado que estamos tratando con problem sobre porcentaje peso/peso de hierro, arena, cobre y aluminio, primero debemos calcular la masa inicial de estos dos primeros en la mezcla original de acuerdo con:
[tex]m_{hierro}=300g*0.60=180g\\\\m_{arena}=300*0.40=120g[/tex]
Ahora si podemos calcular la masa de la mezcla final como la suma de las masas de todos los constituyentes de la mezcla:
[tex]m_T=180g+120g+135g+2.77g=437.77g[/tex]
Finalmente, podemos calcular los porcentajes P/P como se muestra a continuación:
[tex]\%P/P_{hierro}=\frac{180g}{437.77g} *100\%=41.1\%\\\\\%P/P_{arena}=\frac{120g}{437.77g} *100\%=24.4\%\\\\\%P/P_{cobre}=\frac{135g}{437.77g} *100\%=30.8\%\\\\\%P/P_{aluminio}=\frac{g}{437.77g} *100\%=0.6\%[/tex]
¡Saludos!