You would need to mix 0.100 liters (or 100 mL) of the 15M NaNO3 solution with enough solvent (e.g., water) to bring the total volume to 250 mL in order to obtain a 6.0M NaNO3 solution.
To prepare 250 mL of a 6.0M NaNO3 solution from a 15M NaNO3 solution, you can use the dilution formula:
C1V1 = C2V2
Where:
C1 = concentration of the stock solution
V1 = volume of the stock solution to be used
C2 = desired final concentration
V2 = final volume of the diluted solution
In this case:
C1 (concentration of the 15M NaNO3 solution) = 15M
C2 (desired final concentration) = 6.0M
V2 (final volume of the diluted solution) = 250 mL (0.250 L)
Now, plug in the values and solve for V1 (volume of the stock solution to be used):
15M * V1 = 6.0M * 0.250 L
V1 = (6.0M * 0.250 L) / 15M
V1 = 0.100 L
Thus, you would need to mix 0.100 liters (or 100 mL) of the 15M NaNO3 solution with enough solvent (e.g., water) to bring the total volume to 250 mL in order to obtain a 6.0M NaNO3 solution.
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The correct answer for above statement:
chromium is in group 6 d-block
Explanation:
The d-block elements are designated transition metals and have valence electrons in d orbital's. The f-block elements, observed in the two rows at the ground of the periodic table, are called inner transition metals and have valence electrons in the f-orbital's.
Chromium is a synthetic element with symbol Cr and atomic number 24. It is the first component in group 6. It is a steely-gray, glistening, dense and brittle metal which takes a high polish, resists smudging, and has a great melting point.
B. lithium (Li)
C. neon (Ne)
D. radon (Rn)
Answer: Option (A) is the correct answer.
Explanation:
It is known that atomic size of atoms decreases on moving from left to right in a period of the periodic table. Whereas atomic size increases on moving from top to bottom in a group.
Lithium and cesium are both alkali metals. On the other hand, both neon and radon are noble gases.
Both cesium and radon belongs to sixth period. Cesium being at the extreme left side is larger in size than radon which is at the extreme right side of periodic table. Therefore, atomic radius of cesium will be larger than atomic radius of radon.
Whereas both lithium and neon belongs to second period. Lithium being at the top left side of periodic table has larger atomic radius than neon which is at the top right side.
Thus, we can conclude that out of the given options cesium has the largest atomic radius.