How many grams of rubidium are in 2.39 x 1024 atoms of rubidium?
Answer:
339 grams Rb
Explanation:
To find the final answer, you need to (1) convert atoms to moles (via Avogadro's number) and then (2) convert moles to grams (via molar mass from periodic table).
Molar Mass (Rb) = 85.468 g/mol
2.39 x 10²⁴ atoms Rb 1 mole 85.468 g
------------------------------- x ----------------------------- x -------------------- = 339 g Rb
6.022 x 10²³ atoms 1 mole
What is the formula mass
Answer:
mass is always constant for a body.
Explanation:
one way to calculate mass is Mass=Volume ×Density
what occurs when the moon moves through Earth's shadow
Answer:
A Lunar eclipse
Explanation:
A Lunar eclipse occurs only when the sun,earth and moon are exactly aligned with earth .
This can be viewed twice in calendar years.
It's a Lunar Eclipse.
A lunar eclipse is the blocking of sunlight to the moon that occurs when Earth is directly between the sun and the moon. A lunar eclipse occurs when the Moon enters the Earth's shadow. A solar eclipse occurs when the Moon's shadow falls on the Earth. They do not happen every month because the Earth's orbit around the sun is not in the same plane as the Moon's orbit around the Earth.
High-pressure liquid chromatography (HPLC) is a method used in chemistry and biochemistry to purify chemical substances. The pressure used in this procedure range from around 500 kilopascals (500,000 Pa) to about 60,000 kPa (60,000,000 Pa). It is often convenient to know the pressure in torr. If an HPLC procedure is running at a pressure of 5.17x10^8 Pa, what is it’s running pressure in torr?
What is the change in temperature of 150 grams of water when gains 500 Joules of energy?. The Cp for
water is 4.18 J/gxC
The change in temperature of 150 grams of water when gains 500 Joules of energy is 0.797 °C
What is Heat Transfer ?Heat transfer is defined as the process in which the molecules are moved from the region of higher temperature to lower temperature.
The heat transfer can be calculated by the formula
[tex]Q=m \times c \times \Delta T[/tex]
Here, Q is the heat supplied to the system,
m is the mass of the system,
c is the specific heat capacity of the system and
Δ T is the change in temperature of the system.
Substituting the values in the equation
m = 150g
Q=500 Joules
[tex]\rm c_{p}[/tex] = 4.18 J/gxC
500 = 150 * 4.18* Δ T
Δ T = 0.797 °C
Therefore the change in temperature of 150 grams of water when gains 500 Joules of energy is 0.797 °C .
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You are on a camping trip with your family. While you’re toasting marshmallows, one catches on fire.
List three more items that you might have on a camping trip that would burn.
List three items that wouldn’t burn.
What is the boiling point of c
Answer:
90 degree is the boiling point of c
Which of the following is a synthesis reaction?
a) 2KCIO3 → 2KCl + 302
O b) 2 C4H20 + 13 02 + 8 CO2 + 10 H20
O c) Fe + CuCl2 → FeCl2 + Cu
O d) 4 A1+3 02 → 2 Al2O3
Answer: 4 A1+3 02 → 2 Al2O3
Explanation: Two different atoms combines together to produce a compound.
Answer:
c) Fe + CuCl2 → FeCl2 + Cu
Explanation: Synthesis Reaction is when you get same thing on the other side even if its not in the same order after you add the components.
why electron affinity of 5 th group of periodic table increases down the group?
The electron affinity of the 5th group increases down the groups of the periodic table because the electrons are placed in a higher energy level far from the nucleus.
What is electron affinity?Electron affinity is the energy released when an electron is attached to an atom or molecule.
Electron affinity is used as a measure of its ability to form an anion.
The electron affinity of elements decrease down the group and increase from left to right across the periodic table because the electrons are placed in a higher energy level far from the nucleus.
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Which of the following matches a human action with its impact?
Construction of bridges : Water pollution
Construction of dams : Decrease in carbon dioxide level
Use of fertilizers : Increase in population of aquatic animals
Decrease in honeybee population : Increase in plant population
Answer:
hi I'm alvin and it's d
Explanation:
brainliest please
Answer:
Use of fertilizers :Increase in population of aquatic animals.
What is the mass of carbon monoxide (CO) gas if the gas occupies a volume of 4.1 L at 2.0 atm of pressure and -73oC?
Answer:
1.7
Explanation:
When did Stone become interested in caving?
As a child
In high school
During college
After he was 30 years old
Answer:
William Stone (American Caver) became interested in caving in High school .
Which conclusion is true based on the information in this passage
Food webs are connected to each other and sensitive to any changes.
What is food web?A food web is the natural interconnection of food chains and a graphical representation of what-eats-what in an ecological community.
From the information given in the passage, we can conclude the following based on the meaning of food webs.
Food webs are connected to each other and sensitive to any changes.Complete question is below:
Changing one organism in a food web would not have any effect on any other food web.
It is easy to see all the ways that food webs are connected.
Food chains are always separate from each other.
Food webs are connected to each other and sensitive to any changes,
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What is the concentration (molarity) of a solution created by dissolving 81.1 grams of Mg3P2 to create a 2.5 solution?
Answer:
The concentration of Mg3P2 solution = 0.24mol/L
Explanation:
Mass = 81.1g
Volume = 2.5L
Concentration (C) of a solution = [tex]\frac{Moles (n)}{Volume (V)}[/tex]
but moles = [tex]\frac{mass}{Molar mass}[/tex] and Molar mass of Mg3P2 = 134.88g/mol
Moles = [tex]\frac{81.1g}{134.88g/mol}[/tex]
= 0.60mol
hence the concentration can be calculated by;
C = [tex]\frac{0.60mol}{2.5L} \\[/tex]
= 0.24mol/L or 0.24M
At 298 K, AH = 46 kJ/mol and sº = 0.097 kJ/(K-mol). What is the Gibbs
A. 17 kJ
B. 1300 kJ
C. 0.63 kJ
D. 75kJ
The Gibbs Free Energy at 298 K, AH = 46 kJ/mol and sº = 0.097 kJ/(K-mol) is 28.906 kJ/mol
What is Gibb's Free Energy ?It serves as the single master variable that determines whether a given chemical change is thermodynamically possible.
Thus if the free energy of the reactants is greater than that of the products, the entropy of the world will increase when the reaction takes place as written, and so the reaction will tend to take place spontaneously.
Conversely, if the free energy of the products exceeds that of the reactants, then the reaction will not take place in the direction written, but it will tend to proceed in the reverse direction.
At 298 K,
AH = 46 kJ/mol
and sº = 0.097 kJ/(K-mol).
ΔG=ΔH−T⋅ΔS
ΔG = 46 - 298 * 0.097
ΔG = 46 - 28.906
ΔG = 28.906 kJ/mol
The Gibbs Free Energy at 298 K, AH = 46 kJ/mol and sº = 0.097 kJ/(K-mol) is 28.906 kJ/mol
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Answer: A
Explanation: just did it
Using the solubility curve above, what is the solubility of KBr when the temperature is 80°C?
A) 86 g/100 g water
B) 90 g/100 g water
C) 96 g/100 g water
D) 102 g/100 g water
Answer:
C) 96 g/100 g water
Explanation:
If you look for 80°C in x axis and move up from their until you hit the line for KBr, you will see that you hit the KBr line b/w (90-100 in y-axis) thus the closest answer is C) 96 g/100 g water
What does it depend on ?
Answer: According to the molecular orbital theory the shape and size of molecular orbital depends upon- Shape and size of combining atomic orbitals.
Explanation:
help!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Answer:
b
Explanation:
i beleave the answer is b i read it and it looks like the best option hope it helps
What are compounds?
O heterogeneous mixtures
O pure substances
O homogeneous mixtures
Compounds are pure substances the are composed of two or more elements chemically bonded. Compounds have a definite composition, so they are the same throughout, which makes them homogeneous.
Running the reaction at 60 C would cause the reaction to...
a. Run SLOWER than normal.
b. Run FASTER than normal.
Answer:
b. Run FASTER than normal.
Explanation:
Standard temperature is 273 K or 0°C.
Hence, running the reaction at 60°C, which is higher than normal, would cause the reaction to run faster than normal.
A student is studying a sample of neon in a container with a moveable piston (this means the container can change in size). If the sample in the container is initially at a pressure of 759.4 torr when the container has a volume of 97.6 mL, what is the pressure of the gas when the piston is moved so that the volume of the container becomes 146.6 mL? Round your answer to the nearest 0.01 and include units!
The new pressure of the gas would be 505.58 torr
Boyle's lawAccording to Boyle's law, the pressure of a gas is inversely proportional to its volume, provided that the temperature is constant.
This can be mathematically represented as: P1V1 = P2V2
In this case, P1 = 759.4 torr, P2 is what we are looking for, V1 = 97.6 mL, and V2 = 146.6 mL
Hence, P2 = P1V1/V2 = 759.4x97.6/146.6 = 505.58 torr
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which of the following provide evidence of plate motion?
A. shapes of the continents
B. fossil s of the same species found on multiple continents
C. the age distribution of basalt at mid ocean ridges
D. the size of the continents
Answer:
The following evidences of plate motion are:
offset of rocks along the San Andres fault.
the age distribution of basalt at mid-ocean ridges.
the age distribution of the Hawaiian Islands
Heat from a fire place is transferred out to the room it How does the heat from the fire place transfer out to the room?
According to one acid base theory the water acts as ?
Turns Red Litmus paper to BLUE (Blue stays BLUE)
A.) calcium chloride
B.) citric acid
C.) glucose
D.) calcium hydroxide
Determine the equilibrium constant, K, for the equilibrium below given the
equilibrium constants of the other equilibria under the same temperature.
CO(g) + H2O(g) = CO2(g) + H2(g)
h
K7 = ?
2H2(g) + O2(g) = 2H2009)
K2 = 1.22
200(g) + O2(g) = 2C02(g)
Kz = 5.39
= =
Pls help
Answer:
or reactions that are not at equilibrium, we can write a similar expression called the reaction quotient QQQ, which is equal to K_\text cK
c
K, start subscript, start text, c, end text, end subscript at equilibrium.
Explanation:
How many moles of fluorine atoms are present in a sample that contains 4.14 moles of ?
SF4 mol
Answer:
The Avogadro number
One mole of atoms contains 6 x 10 23 atoms, no matter what element it is
Explanation:
Create lattice for CaCl2
How many moles of nitrogen atoms are there in 1.64 x 1023 molecules of dinitrogen trichloride, N2Cl3?
The number of moles of nitrogen atoms are there in 1.64 x 1023 molecules of dinitrogen trichloride is 0.544.
What are a number of moles?The mole is a SI unit of measurement that is used to calculate the quantity of any substance.
1 mole is 6.022 × 10²³
[tex]1\; molecule = \dfrac{1}{6.023 \times 10^2^3}[/tex]
The given number of moles are 1.64 x 10²³
[tex]1.64 \times 10^2^3= \dfrac{1}{6.023 \times 10^2^3} = 0.272 \\[/tex]
Now, there are two molecules of nitrogen in the dinitrogen trichloride
So, 0.272 x 2 = 0.544
Thus, the number of moles of nitrogen atoms are there in 1.64 x 1023 molecules of dinitrogen trichloride is 0.544.
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W
Which option below represents the strongest acids?
A. Ka = 4.0 x 10-10
B. Kb = 4.0 x 10-10
C. Complete (100%) dissociation of hydroxide ion
D. Complete (100%) dissociation of hydrogen ion