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
yulyashka [42]
3 years ago
15

How do you do these?

Chemistry
1 answer:
Agata [3.3K]3 years ago
6 0

Solve these problems like weighted averages:

The first one:

Multiply the masses (isotope numbers) by the decimal form of the percentage. Add them

0.076 (6) + 0.924 (7) = 6.924


The second one:

0.2 (10) + 0.8 (11) = 10.8


If you think about it, these answers make sense. 6.924 is much closer to 7 than to 6 (since there's a lot more lithium-7 than there is lithium-6). 10.8 is closer to 11 than to 10.


You might be interested in
Answer #4 and #5 make sure you have proof and will give brainliest
sweet-ann [11.9K]

Answer:

B,C

Explanation:

7 0
3 years ago
Read 2 more answers
If the rate of decomposition of ammonia, NH3, at 1150 K is 2.10 x 10-6 mol/L/s, what is the
Alina [70]

Answer:

3.15 × 10⁻⁶ mol H₂/L.s

1.05 × 10⁻⁶ mol N₂/L.s

Explanation:

Step 1: Write the balanced equation

2 NH₃ ⇒ 3 H₂ + N₂

Step 2: Calculate the rate of production of H₂

The molar ratio of NH₃ to H₂ is 2:3. Given the rate of decomposition of NH₃ is 2.10 × 10⁻⁶ mol/L.s, the rate of production of H₂ is:

2.10 × 10⁻⁶ mol NH₃/L.s × 3 mol H₂/2 mol NH₃ = 3.15 × 10⁻⁶ mol H₂/L.s

Step 3: Calculate the rate of production of N₂

The molar ratio of NH₃ to N₂ is 2:1. Given the rate of decomposition of NH₃ is 2.10 × 10⁻⁶ mol/L.s, the rate of production of N₂ is:

2.10 × 10⁻⁶ mol NH₃/L.s × 1 mol N₂/2 mol NH₃ = 1.05 × 10⁻⁶ mol N₂/L.s

3 0
3 years ago
I really need help with this Im lost
Illusion [34]
I believe it would weigh less if it’s blown up with helium because helium is lighter than air
5 0
3 years ago
I NEED HELPPPPPP ASAPPPPPPPPPPPP
Mama L [17]
I can’t read ? This what does it say
7 0
3 years ago
if five gases contained in a cylinder each exert a pressure of 1.0 atm what is the total pressure exerted by the gases
UNO [17]

Answer:5.0 atm

Explanation:

See attached photo

6 0
3 years ago
Read 2 more answers
Other questions:
  • Which characteristic property of the substances in the solutions does thin-layer
    10·1 answer
  • A compound has the molecular formula C3H7OH. Which class of organic compounds does it belong to?
    15·2 answers
  • The Balmer series, named after Johann Balmer, is a portion of the hydrogen emission spectrum produced from the transitions betwe
    11·1 answer
  • Carbon tetrachloride reacts at high temperatures with oxygen to produce two toxic gases, phosgene and chlorine. CCl4(g) + (1/2)O
    12·1 answer
  • How does geothermal energy differ from solar energy?
    12·1 answer
  • The equation for the formation of water from hydrogen gas and oxygen gas is 2H2 +
    14·1 answer
  • NUmber 7 plsssssssssssssssssssssssssssssssssssssssssssssss
    8·1 answer
  • What is the molecular weight of potassium ( k2so4)​
    12·1 answer
  • An unbalanced chemical equation for the reaction of boron fluoride with lithium sulfite is shown below. BF3 + Li2SO3 Right arrow
    12·2 answers
  • SCIENCE ANSWER ASAP PLEASE!!
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!