Answer:
Number of moles = 0.05 mol
Explanation:
Given data:
Mass of Pb = 10.5 g
Number of moles of Pb = ?
Solution:
Formula:
Number of moles = mass/molar mass
Molar mass of Pb is 207.2 g/mol.
Now we will put the values in formula.
Number of moles = 10.5 g/207.2 g/mol
Number of moles = 0.05 mol
Answer:
0.8 mL of protein solution, 9.2 mL of water
Explanation:
The dilution equation can be used to relate the concentration C₁ and volume V₁ of the stock/undiluted solution to the concentration C₂ and volume V₂ of the diluted solution:
C₁V₁ = C₂V₂
We would like to calculate the value for V₁, the volume of the inital solution that we need to dilute to make the required solution.
V₁ = (C₂V₂) / C₁ = (2mg/mL x 10mL) / (25 mg/mL) = 0.8 mL
Thus, a volume of 0.8 mL of protein solution should be diluted with enough water to bring the total volume to 10 mL. The amount of water needed is:
(10 mL - 0.8 mL) = 9.2 mL
a small cavity or space in tissue, especially in nervous tissue as the result of disease.
Answer:
340 J·K⁻¹mol⁻¹
Explanation:
I looks like the standard entropy increases approximately linearly with the number of C atoms.
I plotted S° vs the number of C atoms and got the graph shown below.
It appears that S° for four carbon atoms should be about 340 J·K⁻¹mol⁻¹.·
C. Degrees Celsius (°C) is used around the world, except mainly in the US. Absolute 0 is absolute absence of kinetic energy in gas, so 0°C is actually nowhere near absolute 0.
