1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Aleksandr-060686 [28]
3 years ago
7

Rubidium has two naturally occurring isotopes: Rb-85 with mass 84.9118 amu and a natural abundance of 72.17 %, and Rb-87 with ma

ss 86.9092 amu and a natural abundance of 27.83 %. Calculate the atomic mass of rubidium.
Mathematics
1 answer:
lions [1.4K]3 years ago
8 0

Answer:

The atomic mass of rubidium is 85.468 u

Step-by-step explanation:

To determine the average atomic mass of an element, we take the weight average of the atomic masses of its naturally occurring isotopes. This means that alll isotopes together are calculated by multiplying the atomic mass  and the percentage of abundance . So we have sum of all the different isotopes ( which is 100 % of abundance)

For naturally occurring rubidium, there are 2 isotopes.

mass of Rb-85 x abundance + mass of Rb-87 x abundance

84.9118 x 0.7217 + 86.9092 x 0.2783 = 85,46767642

On the periodic table we can see for Rubidium 85.468 u which is the average atomic mass of Rubium ( and its 2 naturally occurring isotopes).

You might be interested in
6
Fed [463]

Answer:

573

Step-by-step explanation:

tjdjfhsdv sgbjregb fyidbghtrf

5 0
3 years ago
What ratios are equivalent to each other.
zysi [14]

Answer:

b and d/ a and c

Step-by-step explanation:

6 0
3 years ago
Read 2 more answers
Members of the drama club spend $795 on t-shirts and sweatshirts for a play.They purchase 20 more tshirts than sweatshirts.They
Anika [276]

Answer:

The drama club bought 35 t-shirt

Step-by-step explanation:

Let

t-shirt = x

Sweatshirt = y

Total cost = $795

They purchase 20 more tshirts than sweatshirts

x = y + 20

The equation is:

12x + 25y = 795

12(y + 20) + 25y = 795

12y + 240 + 25y = 795

37y = 795 - 240

37y = 555

y = 15

Substitute y = 15 into

x = y + 20

x = 15 + 20

x = 35

t-shirt = 35

Sweatshirt = 15

The drama club bought 35 t-shirt

8 0
3 years ago
An airline claims that the no-show rate for passengers is less than 5%. In a sample of 420 randomly selected reservations, 19 we
aleksandr82 [10.1K]

Answer:

An airline claims that the no-show rate for passengers is less than 5%. In a sample of 420 randomly selected reservations, 19 were no-shows. At α=0.01, test the airline's claim. State the sample percentage and round it to three decimal places.

State the hypotheses.

State the critical value(s).

State the test statistics.

State the decision

State the conclusion.

3 0
2 years ago
Which line is the graph of the function y=x+6?
Alecsey [184]

Answer:

when x= 1 then,

y = 1+6

= 7

for me line A will be better with straight line

7 0
2 years ago
Read 2 more answers
Other questions:
  • On friday 1/6 of band pracitce was spent trying on uniforms. the band spent 1/6 of practice on marching, the remaining practice
    10·1 answer
  • The elevation of a sunken ship is -120 feet. Your elevation is 5/8 of the ship's elevation. What is your elevation?
    9·1 answer
  • 5/6
    12·2 answers
  • Katrina had 7/8 of a candy bar she gave 2/3 of it to her brother how much of the Candy bar did Katrina have left
    7·1 answer
  • 5x + 4y = 12<br> 3x + 8y = -32<br> Substitution
    8·2 answers
  • Simplify (X2/3) ^4/5
    12·1 answer
  • Sue wants to use mental math to find 7x53. Write an expression she could use
    9·2 answers
  • A new car has a sticker price of $26,450, while the invoice price paid on it was $20,450. What is the percentage markup?
    5·2 answers
  • Hhhhhhhhhhheeeeeeelp
    11·1 answer
  • The tallest man alive today is 8 feet 3 inches. How tall is he in inches?
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!