# Calculate the mass of cyclopentane formed by the action of sodium on 1.5 dichloropentane with a mass of 2.15.

Let’s implement the solution:
1. In accordance with the condition of the problem, we compose the equation:
m = 2.115 g. X g -?
C5H12Cl + 2Na = C5H10 + 2NaCl – cyclopentane obtained;
2. Calculations by formulas:
M (C5H12Cl) = 143 g / mol;
M (C5H12) = 70 g / mol.
3. Determine the amount of dichloropentane, if the mass is known:
Y (C5H12Cl) = m / M = 2.115 / 143 = 0.014 mol;
Y (C5H12) = 0.014 mol since the amount of substances according to the equation is 1 mol.
4. Find the mass of the product:
m (C5H12) = Y * M = 0.014 * 70 = 1.04 g.
Answer: Cyclopentane weighing 1.04 g was obtained. One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.