Which step you should take before performing a scientific investigation
1 answer:
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Answer:
The concentration of cyclobutane after 875 seconds is approximately 0.000961 M
Explanation:
The initial concentration of cyclobutane, C₄H₈, [A₀] = 0.00150 M
The final concentration of cyclobutane, [] = 0.00119 M
The time for the reaction, t = 455 seconds
Therefore, the Rate Law for the first order reaction is presented as follows;
Therefore, we get;
Which gives;
k ≈ 5.088 × 10⁻⁴ s⁻¹
The concentration after 875 seconds is given as follows;
[] = [A₀]·
Therefore;
[] = 0.00150 ×
= 0.000961
The concentration of cyclobutane after 875 seconds, [] ≈ 0.000961 M
Answer:
7.951 x 0²³atoms
Explanation:
Mass of Fe₃O₄ = 140g
Solution:
To find the number of oxygen atoms in iron(III) oxide, we first find the number of moles in the compound:
Number of moles =
Molar mass of Fe₃O₄ = (3x56) + (4x64) = 168 + 256 =424g/mol
Number of moles = = 0.33mole
1 mole of an atom contains 6.02 x 10²³atoms
∴number of oxygen atoms in Fe₃O₄ = 4 x 0.33 x 6.02 x 10²³atoms
= 7.951 x 0²³atoms