What percentage of the total mass of KHCO₃ is made up by nonmetallic elements?
a. 17%
b. 83%
c. 61%
d. 20%
e. 50%
Solution 1
Mass of H = 1g/mole
Mass of C = 12g/mole
Mass of O = 16g/mole
Mass of KHCO3 = 39.1 + 1 + 12 + 3*16 = 100,1g/mole
100% ------------ 100.1g of KHCO3
x% ----------------- 12g of C
x = 11,99% of C in KHCO3
100% -------------- 100.1 of KHCO3
y% --------------------3*16g of O
y = 47,95% of O in KHCO3
100% ------------- 100.1g of KHCO3
z% ---------------- 1g of H
z = 0,99% of H in KHCO3
11,99% + 47,95% + 0,99% = 60,93% ≈ 61%
answer: C
📚 Related Questions
A. acceleration
B. displacement
C. momentum
D. inertia
Acceleration is the rate at which an object changes its velocity, displacement is the overall change in an object'a position, an momentum is mass in motion.
I. Detecting the presence of isolated double bonds.
II. Finding the concentration of a KMnO₄ solution.
III. Running a flame test to determine if Na+ or K+ is in a solution.
(A ) III only
(B ) II only
(C) I only
(D) II and III
(E ) I and II
thnx u
A. 20.0
B. 20.2
C. 20.8
D. 21.2
E. 21.8
Can anyone explain this one for me?
answer: B
The relative atomic mass of element X which has 2 isotopes is 20.2 u.
What is relative atomic mass ?
Relative atomic mass of an element is an average of masses of atoms of isotopes. It is found out by the formula ,
relative atomic mass=(mass×abundance of isotope 1 )+(mass×abundance of isotope 2)/100
Considering the example given ,atomic mass of element X is found out as,
relative atomic mass=(20×90)+(10×22)/100=2020/100=20.2 u.
Relative atomic mass is a dimensionless physical quantity which is an average ratio of mass of atoms in a sample to the atomic mass constant.Atomic mass constant is 1/12 of mass of carbon-12 atom.
Average atomic mass is relative atomic mass which is calculated from percent composition.Relative atomic mass is unit less and is a physical quantity.It is a multiple of standard atomic mass unit.
Learn more about relative atomic mass,here:
https://brainly.com/question/25698972
#SPJ2
A. It is moving toward Earth.
B. It is moving very fast.
C. It is slowing down.
D. It is moving away from Earth.
Therefore the answer is D.
Hoped I helped:D
a. A pH of 10 is two times as basic
b. A pH of 8 is two times as basic
c. A pH of 10 is 2,000 times as basic
d. A pH of 8 is 20 times as basic
e. A pH of 10 is 100 times as basic
A. acceleration
B. mass
C. force
D. weight
Kg.m
F= -------------
S²
The combination of units written kg· [tex]m/s^{2}[/tex]can be used for force.
What is force?
A force is just a factor that can impact an object's motion. A force may cause a mass item to accelerate by changing its velocity. A push as well as a pull can also be used to describe forces. A force is a vector quantity even though it has both magnitude , direction as well. It can be denoted by the symbol F.
The formula of force (F) = m×a.
where, m is mass of the particle and a is acceleration. It is known that unit of mass is kg and acceleration is [tex]m/s^{2}[/tex].
Now, put the unit of given data in above formula.
F= kg×[tex]m/s^{2}[/tex].
To know more about the force click here.
https://brainly.com/question/13191643.
#SPJ2
in chemistry
Change in speed = (25 - 15) = 10 m/s
Time = 15 s
Acceleration = 10/15 = 2/3 m/s
A. sunspot maxima and minima
B. condensation of a nebula
C. formation of a crater
D. formation of a black hole
has been found to vary up and down in a cycle of very very roughly
about 11 years.