Answer:
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Answer: -
Molality of NaCl = 2.807 ×10⁻² m
Explanation: -
Molarity given = 2.800×10⁻² M
This means there are 2.800×10⁻² moles of NaCl per 1000 mL of solution.
Volume of water = 999.2 ml
Density of water = 0.9982 g/ml
Mass of water = Density of water x Volume of water
= 0.9982 g/ml x 999.2 ml
= 997.4 g
Thus 997.4 g of water has 2.800×10⁻² moles of NaCl.
1000 g of water has
x 2.800×10⁻² moles of NaCl.
= 2.807 ×10⁻² moles of NaCl.
Molality of NaCl = 2.807 ×10⁻² m
Answer:
After 190 s the concentration of X will be 0.0396 M
Explanation:
![ln\frac{A_t}{A_0} = -kt](https://tex.z-dn.net/?f=ln%5Cfrac%7BA_t%7D%7BA_0%7D%20%3D%20-kt)
Where;
Xt is the concentration of X at a time t
X₀ is the initial concentration of X
k is rate constant = 1.7×10⁻² s⁻¹
t is time = 190s
ln(Xt/X₀) = -( 1.7×10⁻²)t
ln(Xt/1.0) = -( 1.7×10⁻²)190
ln(Xt/1.0) = -3.23
![\frac{X_t}{1} = e^{-3.23}](https://tex.z-dn.net/?f=%5Cfrac%7BX_t%7D%7B1%7D%20%3D%20e%5E%7B-3.23%7D)
Xt = 0.0396 M
Therefore, after 190 s the concentration of X will be 0.0396 M
Answer:
They both have a cell membrane, however a plant also has a cell wall.
Explanation:
The standard of something as measured against other things of a similar kind; the degree of excellence of something