Explanation

Let the original weight of the solution = x kg

Acid present in original solution = 92% of x = 0.92x kg

Water is added. Only water is added, so the amount of acid remains the same.

Final weight of solution = 40 kg  

Final concentration of acid = 84%  

Acid present in final solution = 84% of 40 = 0.84 x 40 = 33.6 kg

Since acid remains the same:  

0.92x = 33.6  

x = 33.6 / 0.92  

x = 36.52 kg (approx)

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Explanation

• Enzymes are protein-based chemical compounds produced in the cells of living organisms.
• They act as biological catalysts, speeding up chemical reactions.
• Enzymes are essential for digestion, metabolism, and energy production.

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Explanation

• C₄H₆O most likely belongs to the Aldehyde or Ketone class.
• The formula indicates two degrees of unsaturation, which can include a carbonyl group (C=O).
• Aldehydes and ketones commonly contain this functional group.

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Explanation

Moles needed = 0.5 × 0.1 = 0.05 mol

Molar mass of CaCl₂ = 111 g/mol

Required mass = 0.05 × 111 = 5.55 g

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Explanation

• Amino acids are the building blocks of proteins.
• Proteins are formed when amino acids join together by peptide bonds.
• Proteins are essential for growth, repair, and body functions.
• There are 20 standard amino acids used to make proteins.

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