The mass of an atom of the second bromine isotope is 80.9amu
Calculation of Mass of an atomic isotope
Average atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) / 100
Now given that
Atomic mass of bromine = 79.9 amuPercent abundance of 1st isotope = 50.3%Atomic mass of 1st isotope = 78.9 amuPercent abundance of 2nd isotope = 100-50.3%=49.7%Atomic mass of 2nd isotope =?Plugging in values, we have that
79.9= (50.3×78.9)+(49.7× ?) /100
79.9x 100= (50.3×78.9)+(49.7× ?) /100
7990= 3968.7+(49.7x)
7990- 3968.7=49.7x
4021.3= 49.7x
x=4021.3/49.7
x=80.9amu
Therefore, the mass of an atom of the second bromine isotope is 80.9amu.
See related question on finding mass of an isotope here: https://brainly.com/question/19533439
A compound has a percent composition of 15.24% sodium (molar mass
= 22.99 g/mol), 52.95% bromine (molar mass = 79.90 g/mol), and 31.81%
oxygen (molar mass = 16.00 g/mol). Assuming that the mass of the com-
pound is 100 g, what is the compound's empirical formula?
Show all your work. Please use correct formatting for subscripts and exponents.
The math formula editor makes it easier to show work.
This problem is providing us with the percent composition of a compound containing sodium, bromine and oxygen. Thus, the empirical formula is required and found to be NaBrO₃.
Empirical formulasIn chemistry, empirical formulas are used in order to figure out the minimum whole-number representation of a molecular formula, which contains the actual number of atoms.
Thus, we start determining it by assuming the given percentages as masses and calculating the moles with the atomic mass of the involved elements:
[tex]n_{Na}=\frac{15.24}{22.99}=0.700 \\\\n_{Br}=\frac{52.95}{79.90} =0.663\\\\n_O=\frac{31.81}{16.00}=1.99[/tex]
Next, we divide by the 0.633 as the smallest number of moles in order to determine their subscripts in the chemical formula:
[tex]Na:\frac{0.700}{0.663}=1\\ \\Br:\frac{0.663}{0.663}=1\\ \\O=\frac{1.99}{0.663} =3[/tex]
Hence, the empirical formula turns out to be NaBrO₃.
Learn more about percent composition: brainly.com/question/12247957
I need help please !!!
(01.05 MC)
Two changes are described below.
A. Ice melts to form water.
B. Sugar cubes dissolve in hot coffee.
Which statement is true about the two changes?
Answer:
A is it
Explanation:
Help!! Hurry!! I will mark brainliest if you get it correct. NO SPAM!!!!!!
Write the alpha decay equation for the following isotope:
211/84 PO
Answer:
216/84 Po + 4/2 He a
Explanation:
Answer:
Problem: Polonium-210, 210Po, decays to lead-206, 206Pb, by alpha emission according to the equation 21084Po → 20682Pb + 42He
Explanation:
Determine the number of moles of air present in 1. 35 L at 750 torr and 17. 0°C. Ideal Gas Law formula: PV = nRT(R = 62. 396 L•torr/mol•K) Which equation should you use? P equals StartFraction n R T over V EndFraction. N equals StartFraction R T over P V EndFraction. N equals StartFraction P V over R T EndFraction.
Answer:
Answer: PV/RT = n = N equals startfraction P V over R T endfraction Explanation:
6) The average atomic mass of boron, B, is 10.811 amu. The natural abundance of 10B is 19.7% and it’s exact mass is 10.012 amu. Calculate the exact mass of the second isotope of boron.
Hope you could understand.
If you have any query, feel free to ask.
How to convert formula equations into word equations
Answer:
I don't know what is the answer of it
How does mixing hydrogen peroxide and water test the reactivity of catalase?.
Hydrogen peroxide is not the chemical causing the reaction.
Chemical ReactionGenerally,Catalyses is an enzyme which breaks H2O2 into H2O and O2. there will be no reaction if we combine H2O with H2O2,
H2O2 receives dissolved in water except displaying any reaction. So they are used as bad manipulate in the test.
Therefore, it shows that hydrogen peroxide is not the chemical causing the reaction
For more information on Chemical Reaction
https://brainly.com/question/11231920
(PLEASE HELP WILL MARK BRAINLIEST!!) A scientist wants to develop a new chemical. In one or two sentences, create a science question and a non-science question that the
scientist could consider when developing the new chemical.
Answer:
Science Question: What will the combination of the resources I use to make this new chemical do to different living organisms and non-living organisms around an environment?
Non-Science Question: What should we call this new chemical?
Explanation:
I hope this helps! If you don't like these questions I've got a few more that may work to your liking! :)
please help 500 J of work are done on a box when it is pulled horizontally across a frictionless floor by a force of 50 N. How far did the box slide?
A. 15 m
B. 1 m
C. 10 m
D. 100 m
Answer:
C: 10m
Explanation:
Work Done = Force x Distance
500 = 50 x Distance
To get to 500 multiply 50 by 10!
So, the box slid 10m.
Hope this helps and have a good day! ;D
The time for one cycle of a periodic process is called the:.
Answer:
Period
Explanation:
I believe your answer should be period.
I hope it helps! Sorry if it didn’t… Have a great day!
Layla~
Will it make a difference if we swap the anode and cathode in electroplating?
Answer:
▪ Will it make a difference if we swap the anode and cathode in electroplating?
➢ If we interchange the two terminals after electroplating then the ions deposited on the plate will move again towards their original position.
[tex]TextFromYourMrEx...[/tex]
#CarryOnLearning
Explanation:
if we change the two terminals after electroplatingthen the ions deposited on the plate will move again towards their original position...
how fast is a motor cycle going that travels 6 miles in 4 minutes
Answer: 60 minutes per hour, sixty miles per hour, therefore, one mile per minute.
Explanation:
If a driver takes 30 min to get to the town market, which is 1.5 km away from his house, what is his average speed?
Note: Unit for average speed is km/h
Answer: 0.83 m/s
Linear motion consists of 2: constant velocity motion with constant velocity and uniformly accelerated motion with constant acceleration
How many molecules of sodium nitrate are produced when 40 g of sodium azide, NaN3, react with oxygen?
a
3.7x10^23
b
9.2x10^22
c
1.85x10^23
d
6.02x10^23
The substances produced i. A chemical reaction are called?
Answer:
it’s called a product
Explanation:
think of the different chemicals as a math problem you add two or more things together and you get the product
A chemical reaction is a process in which one or more substances, also called reactants, are converted to one or more different substances, known as products.
Help me please i am so confused Find The Masses
Aluminum
Copper
Iron
Lead
Does Jarren love Maria more or does Jarren love Maria more??
Help please (not for school though)
How many milliseconds (ms) are there in 3. 5 seconds (s)? 35 ms 350 ms 3,500 ms 35,000 ms.
Measurement units are the defined units used for the particular dimensions and proportions. 3500 milliseconds are there in seconds.
What is the unit of time?Time is defined as the rate of things occurring or taking place and is given by seconds, minutes, hours etc.
Using the conversion factor the relation between the seconds and milliseconds is:
1 second = 1000 miliseconds
Convert 3.5 seconds into milliseconds using conversion factor:
[tex]\begin{aligned}3.5 \;\rm seconds &= 3.5 \times 1000 \\\\&= 3500 \;\rm miliseconds\end{aligned}[/tex]
Therefore, option C. 3500 milliseconds is correct.
Learn more about time and second here:
https://brainly.com/question/2025518
Answer:
3500 ms
Explanation:
What mass of silver can be produced from 3.00 g of copper and 3.85 g of silver nitrate?
Answer:
Explanation:
Balanced Chemical Equation:
Cu + 2 AgNO₃ → Cu(NO₃)₂ + 2 Ag
Step 1: Find Limiting Reagent
Moles of Cu:
Mole = 3 g / 63.55 g/mol = 0.04721 mol
Moles of AgNO₃:
Moles = 3.85 g / 169.87 g/mol = 0.022664 mol
Also, Mole ratio of Cu : AgNO₃ is 1 : 2. Hence, 0.04721 mol of Cu will require 0.09442 mol of AgNO₃. This means, AgNO₃ is the limiting reagent.
Step 2: Calculate moles of Ag:
0.022664 mol of AgNO₃ will produce 0.022664 mol of Ag because both have same ratio in balanced chemical equation.
Step 3: Calculate mass of Ag:
Mass = 0.022664 mol × 107.87 g/mol = 2.4447 g
1. What are some things that gray wolves eat?
A. large and small animals
B. trees and plants
C. fruits and insects
D. humans and their pets
Answer:
A, and C are foods that wolves eat.
Explanation: Hope this helps
A force of 129,000 N is accelerating a car at 84 m/s/s
what’s the mass of the car?
Dominique goes to the doctor for bone aches. The doctor tells him
that Vitamin D helps his body take in the Calcium for his bones.
Explain why the doctor tells Dominique to do more outdoor activities.
Answer:
sun gives you vitamin D
Explanation:
Our body creates vitamin D from direct sunlight on our skin when we're outdoors.
On a summer day early in the moming, a balloon is filled with helium when the temperature
is 21°C, but the temperature will reach a peak of 46°C later in the day. The balloon holds 12.8 L of helium gas at a starting pressure of 239 kPa. The balloon will burst when the internal pressure (Pb) reaches 256 kPa. Answer the following questions and show your
work
1. How many moles of helium gas are in the balloon?
2. What will the gas pressure be in the balloon at the peak temperature?
3. Will the balloons burst when the temperature reaches 42 degrees Celsius? Explain.
4. To what pressure should the helium gas pressure be reduced to avoid bursting the balloon? (Assume no significant volume change of the balloon)
Any help I’d great! Equations are not my strong suit
Based on the data provided;
number of moles of helium gas is 1.25 molespressure at peak temperature is 259.3 kPainternal pressure is above 256 kPa, therefore, the balloon will burst.pressure should be reduced to a value less than 256 kPa by reducing the temperatureWhat is the ideal has equation?The ideal gas equation relatesthe pressure, volume, moles and temperature of a gas.
The moles of helium gas is calculated using the Ideal gas equation:
PV = nRTn is the number of moles of gas
R is molar gas constant = 8.314 L⋅kPa/Kmol
P is pressure = 239 kPa
T is temperature = 21°C = 294 K
V is volume = 12.8 L
Therefore;
n = PV/RT
n = 239 × 12.8 / 8.314 × 294
n = 1.25 moles
The number of moles of helium gas is 1.25 moles
At peak temperature, T = 46°C = 319 K
Using P1/T1 = P2/T2
P2 = P1T2/T1
P2 = 239 × 319/294
P2 = 259.3 kPa
The pressure at peak temperature is 259.3 kPa
At 42°C, T = 315 K
Using P1/T1 = P2/T2
P2 = P1T2/T1
P2 = 239 × 315/294
P2 = 256.07 kPa
Since the internal pressure is above 256 kPa, the balloon will burst.
The pressure should be reduced to a value less than 256 kPa by reducing the temperature.
Learn more about gas ideal gas equation at: https://brainly.com/question/12873752
HELP!! ASAP! GIVING 10 POINTS AND BRAINLIEST!!
What is one reason why transpiration is important in plants?
Question 17 options:
It produces food from the sugar in the plant cells.
It enables the flow of water out of the plant.
It produces carbon dioxide in the leaves of the plant.
Answer:
The Answer Is B.
Explanation:
Give Brainliest.
Will a piece of fruit left in the open air rot sooner in summer or in winter?
I have a crush but I don't know how to tell him that I like him what do I do?
Answer:
grab life by the balls and tell him. what harm will it do? you only live once
Answer:
start hanging out with him more
Explanation:
then gradually start giving hints or just ask him striaght up
The molar mass of bismuth (\ce{Bi}BiB, i) is \pu{208.98 g/mol}208.98 g/mol208, point, 98, space, g, slash, m, o, l.
Calculate the mass in grams of a sample of \ce{Bi}BiB, i containing \pu{7.35x10^23}7.35×10
23
7, point, 35, times, 10, start superscript, 23, end superscript atoms.
Another question. What is an example of a chemical change?
Answer:
Yellowing of leaves
Explanation:
Involves the colour change in leaves whereby less amount of chlorophyll is produced
Answer:
burning, cooking, milk becoming curd, rusting of iron
solve this questions please
Answer:
C. through concentrated sulphuric acid and then over heated copper
10.
What are the products of a neutralization reaction?
an acid and a base
a salt and water
a salt and an acid
water and a base
Answer:
Salt and water
Explanation:
The reaction of an acid and a base forming a salt and water.