Answer:
Option d, Amount left = 16 μg
Explanation:
Half life = 88 days
Initial concentration = 128 μg
Amount of material left after n half life = 
Where, n = No. of half life
Amount of material left = 
= 
μg
SO, option d is correct
Answer:Voltage-gated channels open (activate) in response to changes in membrane potential because the electric field acts on the channel to change its protein conformation (or state). It is voltage-gated sodium (Na+) channels that initiate action potentials and voltage-gated K+ channels that cause them to end.
Ok so because the half life is 25 years, the mass will "decrease" by half every 25 years.
So after 25 years it becomes 2 grams,
At 50 yrs it becomes one gram
At 75 years it will be half a gram
At 100 years it will be a quarter of a gram or 0.25 grams.
I.e. the final mass is 0.25 grams
Answer:
The answer to your question is 2.92 x 10⁻⁶ g
Explanation:
Data
mass of K = ?
atoms of K = 4.50 x 10¹⁶
Process
To answer this question just remember that the atomic mass of any element is equivalent to Avogadro's number.
1.- Look for the atomic number of Potassium
Atomic number = 39.10 g
2.- Use proportions and cross multiplication
39.10 g of K --------------- 6.023 x 10²³ atoms
x ----------------4.50 x 10¹⁶ atoms
x = (4.50 x 10¹⁶ x 39.10) / 6.023 x 10²³
-Simplify
x = 1.7595 x 10¹⁸ / 6.023 x 10²³
-Result
x = 2.92 x 10⁻⁶ g
Answer:
The answer is
<h2>0.15 g/mL</h2>
Explanation:
The density of a substance can be found by using the formula
From the question
mass of object = 13.57 g
volume = 89.6 mL
The density is
We have the final answer as
<h3>0.15 g/mL</h3>
Hope this helps you
