Assuming that all concentrations are in aqueous solution (with density =1.0g/mL ), convert the following: A. Unit Conversion (SHOW YOUR WORK, use dimensional analysis method when needed) 1. (1.0 points) 2.4103mg/L of NaCl=??ng/g 2. (1.0 points) 2.0103g/L of NaCl=??ng/mL 3. (1.0 points )0.30mg/g of Cu2+=??ppb 4. (1.25 points) 100ppm of Mg2+=? ? Molar of Mg2+ (molar mass of Mg=24.3g/mol) 5. (1.25 points) Find the concentration of Ca2+(40g/ mole ) expressed as part per thousand for a solution containing 0.050M of CaCO3 ( 100g/ mole ) B. Preparation of Standard Solution from Stock Solution. 7. (1.25 points) What is the initial volume of stock solution ( 0.2M) needed to prepare 10.0mL of standard solution with concentration =0.05M ? 8. (1.25 points) 5.0mL of stock solution is transferred into 20.0mL flask and diluted into the mark. If the concentration of the prepared prepared 20.0mL solution is 0.1M, what is the concentration of stock solution