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412
What is the number of moles of CS2 in a 9.5g sample?
We need to find the number of moles of carbon disulfide (CS2) in a 9.5g sample. First, we need to determine the molar mass of CS2, which is approximately 79.14 g/mol (12.01 g/mol for C + 6 * 32.07 g/mol for S). Now, we can calculate the moles: (9.5 g CS2) / (79.14 g/mol) = 0.125 moles.
413
What is the mathematical representation of the amount of substance altered at an electrode during electrolysis?
Faraday's first law of electrolysis states that the amount of substance altered at an electrode is directly proportional to the quantity of electricity passed. This is mathematically represented as w=ZAt, where w is the amount of substance, Z is the electrochemical equivalent, A is the current and t is the time.
Nucleic acids were first demonstrated in pus cells, which are a type of white blood cell infected with bacteria. This discovery was made by Friedrich Miescher in the 19th century.
415
First ionization potential of alkaline earth metal is greater than alkali metals because___________________?
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416
Which layer of atmosphere is first exposed to sunlight?
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418
When earth's crust is drilled, the hydrocarbon came out first is
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419
After the first three members, the next eight members of alkynes are
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420
In which of the following processes does the entropy of the system decrease?
Entropy is a measure of disorder. Crystallisation involves the transition from a disordered liquid state to a highly ordered solid crystal lattice, resulting in a decrease in entropy. Conversely, melting, vaporisation, and rusting (which involves the formation of complex oxides and often gas consumption/expansion) generally increase the disorder or entropy of the system.
