The term "pKa" is a measure of the strength of an acid in solution. It is defined as the negative base 10 log of the acid dissociation constant. A lower pKa value indicates a stronger acid and A higher pKa value indicates a weaker acid
Answer:
Y>Q>W>Z>X
Explanation:
Each more reactive element on the list replaces from a compound any of the elements below it (less reactive).
Q>W
Z>X
W>Z
Y>Q
Thus,
Y>Q>W>Z>X
Answer:
almonds and sesame oil have the same amount of fat.
Explanation:
Almonds: 14 g
Butter: 12 g
Sesame Oil: 14 g
2.5 X 10²⁴ atoms of copper is equivalent to 266.7g of Cu.
HOW TO CALCULATE MASS:
- The mass of a substance can be calculated by multiplying the number of moles of the substance by its molar mass. That is;
- mass of substance (g) = no. of moles (mol) × molar mass (g/mol)
- However, the number of moles of copper must first be calculated by dividing the number of atoms by Avogadro's number as follows:
- no. of moles of Cu = 2.5 X 10²⁴ ÷ 6.02 × 10²³
- no. of moles = 2.5/6.02 × 10²⁴-²³
- no. of moles = 0.42 × 10¹
- no. of moles = 4.2moles of copper.
- Molar mass of copper = 63.5g/mol
- Mass of copper = 4.2mol × 63.5g/mol
Therefore, 2.5 X 10²⁴ atoms of copper is equivalent to 266.7g of Cu.
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