Answer:
Average atomic mass = 6.94 amu.
Explanation:
Given data:
Average atomic mass = ?
Atomic mass of first isotope = 6.017 amu
Atomic mas off second isotope = 7.018 amu
Abundance of fist isotope = 7.30%
Abundance of second isotope = 92.70%
Solution:
Average atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) / 100
Average atomic mass = (7.30×6.017)+(92.70×7.018) /100
Average atomic mass = 43.924 + 650.57 / 100
Average atomic mass = 694.494 / 100
Average atomic mass = 6.94 amu.
The average atomic mass is 6.94 amu.
Details required to solve average atomic mass:The Atomic mass of the first isotope = 6.017 amu
Atomic mas off second isotope = 7.018 amu
The abundance of first isotope = 7.30%
The abundance of second isotope = 92.70%
Calculation of average atomic mass:Average atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) / 100
= (7.30×6.017)+(92.70×7.018) /100
= 43.924 + 650.57 / 100
= 694.494 / 100
= 6.94 amu.
Learn more about the mass here: https://brainly.com/question/24743133
For the balanced equation shown below, if the reaction theoretically
should produce 7.99g CaO but experimentally produces 6.81 grams of
CaO, what is the percent yield?
CaCO3---->CaO+CO2
85.23%
0 14.77%
54.41%
O 117.33%
Answer:
Percent yield = 85.23%
Explanation:
Given data:
Theoretical yield = 7.99 g
Actual yield = 6.81 g
Percent yield of CaO = ?
Solution:
Formula:
Percent yield = ( actual yield / theoretical yield ) × 100
by putting values,
Percent yield = (6.81 g/ 7.99 g) × 100
Percent yield = 0.8523× 100
Percent yield = 85.23%
True or false: Oceans have no effect on the temperature on Earth’s land???
Answer:
false
Explanation:
anybody know the answer to this ???
Answer:
Answer is C.
Explanation:
I hope it's helpful!
I need help with this one question
Answer:
colder
Explanation:
Which of the following is not a trend that varies systematically in the periodic table
A ) electronegative
B) Symbol of elements
C) ionization energy
D) atomic radius
E) Ionic radius
Answer: B: Symbols of Elements
Explanation:
The periodic table is a table of chemical elements that shows us the trends and characteristics of the elements. The periodic trends are a specific pattern of the major and minor elements.
The trends are shown by the electronegativity, ionization energy, electronic affinity, ionic radius, atomic radius, and chemical reactivity. This trend arises from the changes in the atomic structure of the chemical elements.This pattern is based on the periodic laws and states that the chemical elements are put in order of increasing atomic number. However, they don't follow the symbols of elements.Hence the option B is correct.
Learn more about the is not a trend that varies systematically in the periodic table.
brainly.com/question/14214326.
Which of the following represents a neutralization reaction which hydrofluoric acid and sodium hydroxide(a base) react to produce sodium choride(a salt) and water? 
Explanation:
A neutralization reaction is a reaction that involves an acid and a base.
When an acid reacts with a base to produce salt and water only, the reaction is said to be a neutralization reaction.
Acid + Base → Salt + Water
Such reactions are classified as a double displacement reaction in which a non-ionizing product is formed
In a modern periodic table the element are arranged in order of increasing
Answer:
what are you asking?
Explanation:
An element whose particles are atoms
Answer:
a chemical element
Explanation:
A chemical element is a substance that contains only one type of atom
If you need 2.5 moles of Rb2Cr7, how many grams do you need?
Answer:
0
Explanation:
A barometer is a tool that scientists use to measure dew point , rainfall amounts, temperature, air pressure helppppp
Answer:
All of that is correct i am confused on what u are asking us to answer
Explanation:
Answer:
A barometer measures atmospheric/ air pressure ( D)
Explanation: I researched this topic prior to answering the following question.
How many moles is 0.025 g of NaCO3? (Show Your Work)
mol of Na2CO3 = 2.36 x 10⁻⁴
Further explanationGiven
Mass : 0.025 g of Na2CO3
Required
moles
Solution
The mole is the number of particles contained in a substance
1 mol = 6.02.10²³
Moles can also be determined from the amount of substance mass and its molar mass :
mol = mass : molar mass
mass = mol x molar mass
Input the value :
mol = mass : MW Na2CO3
mol = 0.025 g : 106 g/mol
mol = 2.36 x 10⁻⁴
How many chemical changes can something go through
Answer:
Only one
Explanation:
How many molecules are there in 5.9 moles of NaCl?
The number of molecules= 3.55 x 10²⁴
Further explanationGiven
5.9 moles of NaCl
Required
The number of molecules
Solution
The mole is the number of particles(molecules, atoms, ions) contained in a substance
1 mol = 6.02.10²³ particles
Can be formulated
N=n x No
N = number of particles
n = mol
No = Avogadro's = 6.02.10²³
So for 5.9 moles :
= 5.9 x 6.02 x 10²³
= 3.55 x 10²⁴
9. John checked his car tire volume when the temperature outside was 80 °F. He was
happy to see that the tires were inflated properly to 10 L. The temperature the next
day was a record low for the time of year he was in. He noticed that his tires all
looked sort of flat. He checked the volume again and found the volume of air was
half what it was the day before. What temperature was the record low?
Chemical properties describe matter based on its ability to change into___
A. A new substance
B. The same thing
C. Water
D. A powder
Answer:
A. A new substance
Explanation:
sorry if its wrong if its right your welcome <3
BRAINLIST!!!
Water moving along the water cycle also moves through the Earth's environment in the form of rain, ice, snow, and surface water. This water has helped to shape the Earth's surface by which of the following processes?'
radioactive decay
chemical weathering
dissolving
physical weathering
oxidation
Answer:
I believe it is chemical weathering, physical weathering, oxidation, and dissolving...
Explanation:
Α. Helium (He)
В. Beryllium (Be)
C. Phosphorus (P)
D. Sulfur (S)
Answer: d
Explanation:
In the following chemical equation, which are the reactants?
2HF + Mgo MgF2 + 2H20
>
A. 2HF + MgF2
B. 2H+ + Mgo
C. MgF2 + H20
D. MgO + H20
A
B
D
How does the molecular formula of a compound differ from the empirical formula? Can a compound’s empirical and molecular formulas be the same? Explain.
PLs help mweee Ill mark brainliest
the 3rd one is the answer
Which of the following shows the proper configuration of a straight chain isomer of nonane?
A.)A
B.)B
C.)C
Answer:
I need help with this as well if you get the answer please let me know
Explanation:
What is the acceleration at 5s?
Answer:
-10 divided by 5=-2m/s squared
Explanation:
Answer:
A body falls for 5s from rest. If the acceleration due to the gravity of earth ceases to act, The distance travels in the next 3s is.
Explanation:
hopeot help you
A chip is burned beneath an aluminum container holding 28.7 g of water causing the temperature of the water to increase from 11.3 °C to 33.2 °C. How many joules of heat were absorbed by the water? Water’s specific heat is 4.18 J/gºC
Answer:
Q = 2627.25 J
Explanation:
Given that,
The mass of water, m = 28.7 g
The temperature of the water to increase from 11.3 °C to 33.2 °C
The specific heat of water is 4.18 J/gºC
The heat absorbed by the water is given by :
[tex]Q=mc\Delta T\\\\Q=28.7 \times 4.18 \times (33.2-11.3)\\\\Q=2627.25\ J[/tex]
So, 2627.25 J of heat is absorbed by the water.
In your own words, define the word "potential"
Answer:
1 : the chance or possibility that something will develop and become real There is a potential for injury. 2 : an ability or quality that can lead to success or excellence : promise She has great potential as a musician.
Explanation:
Answer:
potential: possessing or demonstrating the ability to evolve into or become something in the future.
OAmalOHopeO
If you have 40.0 g HCl and 40.0 g NaHCO3, do you have the same number of moles of each?
They both have a different number of moles
Further explanationGiven
40 g HCl
40 g NaHCO3
Required
moles
Solution
The mole is the number of particles contained in a substance
1 mol = 6.02.10²³
Moles can also be determined from the amount of substance mass and its molar mass
n = mass : molar mass
So the moles of a compound are affected by its molar mass (inversely proportional)
The larger the molar mass (of the same mass), the smaller the moles
molar mass HCl = 58.5 g/mol
molar mass NaHCO3 = 84 g/mol
mol HCl :
= 40 : 58.5
= 0.684
mol NaHCO# :
= 40 : 84
= 0.476
Which is an example of kinetic friction?
friction between a car’s windshield and the air as you drive into the wind
friction between a sticky note and the page of a book as it marks your place
friction between your shoes and the ground when you stand still
friction between your skin and a pencil as it rests in your palm
Answer: friction between a car's windshield and the air as you drive into the wind.
Explanation: Hope this helps :)
NEED HELP NOW!!!!!! Suppose two chemicals are reacted together. It takes 600 kJ of energy to break the bonds of the reactants and 950 kJ of energy are released by the formation of the products. What is AH for the reaction?
O kJ
0-600 kJ
600 kJ
-350 kJ
Answer:
600 kj
Explanation:
thats just the answerr
1. What does the Law of conservation of mass state?
a. According to the Law of Conservation, what is true about the masses of the reactants and the products in a chemical reaction?
b. Find the missing mass in the reactions below:
MgO + H2O → Mg(OH)2
12.4 g ? 21.8
Answer:
According to the law of conservation of mass, the mass of the products in a chemical reaction must equal the mass of the reactants. The law of conservation of mass is useful for a number of calculations and can be used to solve for unknown masses, such the amount of gas consumed or produced during a reaction.
An object of mass 800g hangs on a spring.Calculate the force exerted by the object if acceleration due to gravity is 10meters per second square
The force exerted : 8 N
Further explanationGiven
mass = 800 g
Acceleration = 10 m/s²
Required
The force exerted
Solution
Newton's 2nd law explains that the acceleration produced by the resultant force on an object is proportional and in line with the resultant force and inversely proportional to the mass of the object
∑F = m. a
[tex]\large {\boxed {\bold {a = \frac {\sum F} {m}}}[/tex]
F = force, N
m = mass = kg
a = acceleration due to gravity, m / s²
Input the value :
F = 0.8 kg x 10 m/s²
F = 8 N
how many vitamin c tablets is 250mg? (i’ll give brainliest)