3 years ago

A radioactive sample has a half-life of 5 hours. What fraction of the sample will be left after 15 hours?

Chemistry

1 answer:

DedPeter [7]3 years ago

6 0

Explanation:

hiiiii beautiful.........

You might be interested in

Which is greater 50 degree celcius or 50 degree fahrenheit?with solution plz.....

zheka24 [161]

Answer: 50 degrees Celsius is hotter than 50 degrees F. 50 degrees Celsius is half way between freezing and boiling

4 0

2 years ago

Which element consists of positive ions immersed in a "sea" of mobile electronsa) sulfur

Margarita [4]

Hello
Sulfur is the answer

5 0

2 years ago

How many atoms of Pb are there?

jeka94

Answer: i believe it is

602,000,000,000,000,000,000,000 atoms

Explanation:

6.02×1023 atoms/mole

6 0

3 years ago

How many milliliters of a 0.285 M HCl solution are needed to neutralize 249 mL of a 0.0443 M Ba(OH)2 solution?

meriva

Answer:

$\large \boxed{\text{77.4 mL}}$

Explanation:

Ba(OH)₂ + 2HCl ⟶ BaCl₂ + H₂O

V/mL: 249

c/mol·L⁻¹: 0.0443 0.285

1. Calculate the moles of Ba(OH)₂

$\text{Moles of Ba(OH)$_{2}$} = \text{0.249 L Ba(OH)}_{2} \times \dfrac{\text{0.0443 mol Ba(OH)}_{2}}{\text{1 L Ba(OH)$_{2}$}} = \text{0.011 03 mol Ba(OH)}_{2}$

2. Calculate the moles of HCl

The molar ratio is 2 mol HCl:1 mol Ba(OH)₂

$\text{Moles of HCl} = \text{0.011 03 mol Ba(OH)}_{2} \times \dfrac{\text{2 mol HCl}}{\text{1 mol Ba(OH)}_{2}} = \text{0.022 06 mol HCl}$

3. Calculate the volume of HCl

$V_{\text{HCl}} = \text{0.022 06 mol HCl} \times \dfrac{\text{1 L HCl}}{\text{0.285 mol HCl}} = \text{0.0774 L HCl} = \textbf{77.4 mL HCl}\\\\\text{You must add $\large \boxed{\textbf{77.4 mL}}$ of HCl.}$

8 0

3 years ago

Which element is most likely to gain an electron?

Oduvanchick [21]

B. Fluorine (F) is the right answer

3 0

3 years ago

A radioactive sample has a half-life of 5 hours. What fraction of the sample will be left after 15 hours?​

A radioactive sample has a half-life of 5 hours. What fraction of the sample will be left after 15 hours?