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
AnnyKZ [126]
2 years ago
8

Niobium-91 has a half-life of 680 years. After 2,040 years, how much niobium-91 will remain from a 300. 0-g sample? 3 g 18. 75 g

37. 5 g 100. 0 g.
Mathematics
1 answer:
alekssr [168]2 years ago
8 0

Answer:

Amount of Niobium-91 initially

= 300/91 =3.2967mol

2040 years = 3 ×680 = 3 half-lives

therefore, amount left = 0.4121mol

mass of Niobium-91 remaining = 0.4121 ×91 =37.5g

Please give brainliest

You might be interested in
Will give 5 starts, thanks need this FAST!!!!!!!!!!!!!!!
Katarina [22]

Answer:

100

Step-by-step explanation:

4 0
3 years ago
6) You can buy 3 apples at the Quick Market for $1.26. You can buy 5 of the same apples at Stop and Save for $1.15. Which place
Marysya12 [62]

Answer:

Stop and save is the best

Step-by-step explanation:

I say this because your getting  the same apples for cheap not only are they cheap but your also getting more.

6 0
3 years ago
What is the topic of an informational writing piece? (1 point) the subject or focus of your writing the formal meanings of words
Lyrx [107]

Answer:

Chapter 1. ... An expository essay allows the writer the opportunity to explain his or her ideas ... Facts. Explanations. Details. Definitions. It may also include the writer ... The first body section or paragraph should focus on one of your main points ... You will learn about the different ways to organize your body paragraphs in ...

Step-by-step explanation:

an error occurred while processing this directive] TIP Sheets > Writing Skills: Style, ... The main point of a piece of writing, often stated in a thesis statement or topic sentence. ... into a pattern or style; the way in which the content of writing is organized. ... and autobiographical information, often a source of ideas for writing.Whether you are messaging a colleague, writing to your manager, creating the ... may label and group the stages in various ways, the stages of the writing process are ... information to support or explain what you want to say about your subject, and ... in general at the beginning of prewriting before focusing on your topic.

t can be an individual object or a group of objects. ... As an information report is a factual piece of writing with a focus on attention to ... When putting together an information report you need to know your topic well so be ... should reinforce points made in the text, often in a condensed way. ... 1. Define the Scope of the Topic.

This step-by-step guide on expository writing includes expository essay ... Parents, does your student need assistance with writing an expository essay? ... of a subject based on facts—with no references to the writer's opinions or emotions. A typical expository writing prompt will use the words “explain” or “define,” such as in, ...

8 0
3 years ago
What is the equation of the graphed line written in standard form?
Marianna [84]

Answer:

The answer is A)x = –3

Step-by-step explanation:

y=0 x=-3

3 0
3 years ago
Read 2 more answers
if i earn 8 dollars after taxes are taken out of my paycheck and my. insurance is 200 a month how many hour would i need to pay
avanturin [10]
25 hours in all would cover your insurance
8 0
4 years ago
Other questions:
  • Some life insurance policies have cash value and loan value benefits. Some life insurance policies have cash value and loan valu
    8·2 answers
  • A week before the election, 1,500 people were asked who they planned to vote for. 45% said they planned to vote for Candidate X.
    11·1 answer
  • The 20-inch-diameter wheels of one car travel at a rate of 24 revolutions per minute,
    7·1 answer
  • HELP IVE NEVER SEEN THIS BEFORE! WILL BE MARKED BRAINLIEST
    7·1 answer
  • If circumference of a circle is 1, what is the radius of the circle?
    8·2 answers
  • 15m+20g=300<br>m+g=17<br><br>solve by elimination and SHOW YOUR WORK​
    12·1 answer
  • The total mass of cells in a petri dish is 3 × 10–2 gram. The mass of each cell is 4 × 10–5 gram.
    15·1 answer
  • If f(x) = 3x+2 what is f(5)?
    9·2 answers
  • HELP ASAP!! questions are in the pic
    6·2 answers
  • An experiment was conducted, and it was determined that as the amount of sunlight increased, the height of the plants increased.
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!