A0.1025-g sample of copper metal is dissolved in 35 ml of concentrated hno3 to form cu2 ions and then water is added to make a total volume of 200.0 ml. (calculate the molarity of cu2.)
Molarity is defined as number of moles of solute in 1 L of solution. Here, 0.1025 g of Cu is reacted with 35 mL of HNO_{3} to produced Cu^{2+} ions. The balanced reaction will be as follows: Cu+3HNO_{3}rightarrow Cu(NO_{3})_{2}+NO_{2}+H_{2}O From the above reaction, 1 mole of Cu produces 1 mole of Cu^{2+}, convert the mass of Cu into number of moles as follows: n=frac{m}{M} molar mass of Cu is 63.55 g/mol thus, n=frac{0.1025 g}{63.55 g/mol}=0.0016 mol Now, total molarity of solution, after addition of water is 200 mL or 0.2 L can be calculated as follows: M=frac{n}{V}=frac{0.0016 mol}{0.2 L}=0.008 mol/L=0.008 M Thus, molarity of Cu^{2+} is 0.008 M.
10 years is the answer
cytokinesis is the splitting of a cell membrane to form 2 identical daughter cells. it’s similar to mitosis as both cells have identical copies of dna and cytokinesis is a step in the mitotic cycle.
