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
Tresset [83]
3 years ago
12

The half-life of sodium-24 is 15 days. A laboratory technician measures out a 72 g sample. Approximately how many grams of sodiu

m-24 would remain after 45 days?
Chemistry
1 answer:
Vanyuwa [196]3 years ago
6 0

Answer:

after 45 days 9 g left

Explanation:

Given data:

Half life Na-24 = 15 days

Mass of sample = 72 g

Mass remain after 45 days = ?

Solution:

Number of half lives passed:

Number of half lives = time elapsed / half life

Number of half lives = 45 days / 15 days

Number of half lives = 3

At time zero total amount = 72 g

After first half life = 72 g/ 2= 36 g

At 2nd half life = 36 g/2 = 18 g

At 3rd half life = 18 g/2 = 9 g

Thus after 45 days 9 g left.

You might be interested in
What is 190 K in degrees Celsius? Show your work for full credit.
saveliy_v [14]

Answer:

-83.15

Explanation:

190K − 273.15 = -83.15°C

3 0
3 years ago
Why do sea and ocean levels recede (more coast land is exposed) when the planet goes through a major ice age?
fomenos
This happens because ice is made up of water, and when that water freezes, it never goes back to land, thus there being less water on the coastline. But when the ice starts to melt, the water will even out quickly, and the water will go to the coastline, causing the tide to rise. Mark brainliest, please.

3 0
3 years ago
What are compounds????????????????
sweet [91]

Answer:

Compounds are pure substance consisting of two or more different atoms

8 0
3 years ago
Read 2 more answers
What is the meaning of pseudopod? A. true foot B. true hand C. false foot D. false hand
tankabanditka [31]

Answer: Pseudopodia are temporary and cytoplasm-filled parts of the cell membrane that are able to change their form in order to move. They are used in some eukaryotic cells to move around or to eat. Most cells that do this are called amoeboids.

6 0
4 years ago
Read 2 more answers
The IUPAC name for CH3CH2COOCH2CH3 is​
Veseljchak [2.6K]

Answer:

Ethoxy ethen. This compund is the functional group of ethar ( R-O-R )

Explanation:

3 0
3 years ago
Read 2 more answers
Other questions:
  • For an atoms electrons, how many energy sub levels are present in the principal energy level n=4?
    10·1 answer
  • How many moles of carbon dioxide are produced from 8.73 moles of tristearin?​
    9·1 answer
  • How many moles of Cl2 will produce 0.35 miles of NaCl when reacted with excess Na?
    5·1 answer
  • What would most likely happen as a result of the generator in a wind turbine breaking?
    6·2 answers
  • Heating glucose, a monosaccharide sugar, in the presence of excess oxygen produces carbon dioxide gas and water vapor. Balance t
    15·1 answer
  • Which type of wave to support the idea that light is also made of waves
    10·1 answer
  • How does a nuclear reactor produce electricity
    10·1 answer
  • How many grams of CO2 should be placed in a 250 mL container and -24°C to produce a pressure of 95K PA?
    14·1 answer
  • The. bond dissociation enthalpies of the H-H bond and the H-Cl bond are 435 kJ mol^-1 and 431 kJ mol^-1, respectively. The ΔHfO
    13·1 answer
  • 15. conjugated dienes routinely undergo 1,2 and 1,4 addition reactions with a variety of electrophilic reagents; this suggests t
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!