<u>Answer:</u> The volume of stock solution of strontium hydroxide needed is 4.125 mL
<u>Explanation:</u>
1 mole of
produces 1 mole of strontium ions and 2 moles of hydroxide ions
Molarity of diluted strontium hydroxide solution = ![\frac{0.200}{2}=0.100M](https://tex.z-dn.net/?f=%5Cfrac%7B0.200%7D%7B2%7D%3D0.100M)
To calculate the molarity of the diluted solution, we use the equation:
![M_1V_1=M_2V_2](https://tex.z-dn.net/?f=M_1V_1%3DM_2V_2)
where,
are the molarity and volume of the concentrated strontium hydroxide solution
are the molarity and volume of diluted strontium hydroxide solution
We are given:
![M_1=1.212M\\V_1=?mL\\M_2=0.100M\\V_2=50mL](https://tex.z-dn.net/?f=M_1%3D1.212M%5C%5CV_1%3D%3FmL%5C%5CM_2%3D0.100M%5C%5CV_2%3D50mL)
Putting values in above equation, we get:
![1.212\times V_1=0.100\times 50\\\\V_1=\frac{0.1\times 50}{1.212}=4.125mL](https://tex.z-dn.net/?f=1.212%5Ctimes%20V_1%3D0.100%5Ctimes%2050%5C%5C%5C%5CV_1%3D%5Cfrac%7B0.1%5Ctimes%2050%7D%7B1.212%7D%3D4.125mL)
Hence, the volume of stock solution of strontium hydroxide needed is 4.125 mL
3.3 moles of sulfur
Explanation:
To find the number of moles knowing the number of atoms we use Avogadro's number to formulate the following reasoning:
if in 1 mole of sulfur (S) there are 6.022 × 10²³ atoms of sulfur (S)
then in X moles of sulfur (S) there are 2 × 10²⁴ atoms of sulfur (S)
X = (1 × 2 × 10²⁴) / (6.022 × 10²³)
X = 3.3 moles of sulfur
Learn more about:
Avogadro's number
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Conservation
conservation is the act of protecting animals and resources for current and future generations
Answer:
the process by which substances in their gaseous state are converted to the liquid state.
Explanation:
When pressure on a gas is increased, its molecules closer together, and its temperature is reduced, which removes enough energy to make it change from the gaseous to the liquid state.