A common conversion factor is that 22.4 liters of a gas at STP is equal to one mole of that substance.
21 L / 22.4 L = 0.9375 moles of CO2
One mole of any substance contains an Avogadro’s number of atoms: 6.022 x 10^23 atoms/mol.
0.9375 mol x (6.022 x 10^23 atoms/mol) = 5.646 x 10^23 atoms of CO2
21 liters of CO2 contains 5.646 x 10^23 atoms of CO2.
Answer:
Explanation:
To convert from grams to moles we must use the molar mass, which is found on the Periodic Table.
Use the molar mass as a ratio.
Multiply by the given number of grams: 118
Flip the fraction so the grams of argon will cancel each other out.
The original measurement of grams had 3 significant figures, so our answer must have 3 sig figs.
For the number we calculated, that is the hundredth place. The 7 in the thousandth place tells us to round the 5 to a 6.
There are about <u>2.96 moles of Argon</u> in 118 grams.
The fraction of the original amount remaining is closest to 1/128
<h3>Determination of the number of half-lives</h3>
- Half-life (t½) = 4 days
- Time (t) = 4 weeks = 4 × 7 = 28 days
- Number of half-lives (n) =?
n = t / t½
n = 28 / 4
n = 7
<h3>How to determine the amount remaining </h3>
- Original amount (N₀) = 100 g
- Number of half-lives (n) = 7
- Amount remaining (N)=?
N = N₀ / 2ⁿ
N = 100 / 2⁷
N = 0.78125 g
<h3>How to determine the fraction remaining </h3>
- Original amount (N₀) = 100 g
- Amount remaining (N)= 0.78125 g
Fraction remaining = N / N₀
Fraction remaining = 0.78125 / 100
Fraction remaining = 1/128
Learn more about half life:
brainly.com/question/26374513
Answer:
Solutions with low pH have a sour taste.
Explanation:
A major function of the endomembrane system is transporting substances in a cell.proteins are transported either in or out the cell