Answer:
The amount left after 49.2 years is 3mg.
Explanation:
Given data:
Half life of tritium = 12.3 years
Total mass pf tritium = 48.0 mg
Mass remain after 49.2 years = ?
Solution:
First of all we will calculate the number of half lives.
Number of half lives = T elapsed/ half life
Number of half lives = 49.2 years /12.3 years
Number of half lives = 4
Now we will calculate the amount left after 49.2 years.
At time zero 48.0 mg
At first half life = 48.0mg/2 = 24 mg
At second half life = 24mg/2 = 12 mg
At 3rd half life = 12 mg/2 = 6 mg
At 4th half life = 6mg/2 = 3mg
The amount left after 49.2 years is 3mg.
The STP is Standard temperature and pressure.
Standard temperature is defined as zero degrees Celsius (0° C)
Standard pressure supports 760 millimeters in a mercurial barometer (760 mmHg)
we have that
760 mmHg= 1 atm
therefore
the answer is 0 deg C and 1 atm.
Answer:
At end point there will a transition from pink to colorless.
Explanation:
As the student put the vinegar in the titrator and NaOH in the beaker, it means that he has poured phenolphthalein in the NaOH solution.
The pH range of phenolphthalein is 8.3-10 (approx), it means it will show pink color in basic medium.
So on addition of phenolphthalein in NaOH the solution will become pink in color.
When we start pouring vinegar from titrator neutralization of NaOH will begin.
On complete neutralization , on addition of single drop of vinegar the solution will become acidic and there will be complete disappearance of pink color solution in the beaker.
Answer:
Presence of unlimited number of elements in the periodic table The inability of atoms to align perfectly with other atoms The ability of all elements to react with every other element All elements being equally reactive.
Answer:
<h3><em>A is most likely your correct answer</em></h3>
Explanation:
A. Hills Covered with dry brush- this is most likely correct
b. Hills covered in lush grass- incorrect, because it is LUSH grass which would require lots of rain.
c. Flat lands with little grass- incorrect because grasslands DO have lots of grass.
D- incorrect because grasslands typically do NOT have rocky mountains <u>but are generally flatlands with grass</u>
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<h3>I am so sorry if this is wrong, I am just using common knowledge. TREASURE EVERY MOMENT AND HAVE AN AMAZING DAY!! ;)</h3>
