The weight of 16.3 moles of nickel amounts to 956.647 g.
The answer is - 0.138 M. The buffer pH can be determined using the Henderson equation. Here,
acts as a weak acid and
serves as its corresponding conjugate base. The weak acid has two protons, while the base contains one. The equation can therefore be expressed in terms of protons transferred. Phosphoric acid can donate protons in three stages; the equation we’ve referenced pertains to the second stage, as the acid then has only two protons available and the base only one. Given the concentration of the acid as 0.10 M, we need to calculate the concentration of the base necessary to form a buffer with a pH of exactly 7.0. Substituting the values into the equation leads us to the solution. Cross-multiplying, we find that [base] = 1.38(0.10), yielding [base] = 0.138. Therefore, the concentration of the base needed for the buffer is 0.138 M.
Diethyl ether (DTH) and Tetrahydrofuran (THF).
Clarification:
- Grignard reactions react with water, resulting in the formation of alkanes. The presence of water leads to rapid decomposition of the reagent.
Therefore, solvents like anhydrous diethyl ether or tetrahydrofuran (THF), as well as poly(tetramethylene ether) glycol (PTMG), are used in experimental procedures to limit the exposure of Grignard reagents to air and moisture.
These solvents are chosen because the oxygen they contain stabilizes the magnesium reagent.
THF is a stable compound.
Answer:
1.2×10²³ atoms.
Explanation:
In the problem, we see the data:
Mole of propanone = 0.20 mole
Calculating the number of atoms in propanone =?
According to Avogadro's principle, one mole of a substance contains 6.022×10²³ atoms.
This means that one mole of propanone also holds 6.022×10²³ atoms.
Thus, we can determine the atom count in 0.20 mole of propanone as:
1 mole of propanone contains 6.022×10²³ atoms.
Accordingly, 0.20 mole of propanone will have = 0.2 × 6.022×10²³ = 1.2×10²³ atoms.
Therefore, 0.20 mole of propanone contains
1.2×10²³ atoms.
