Biochem

Would anyone be able to help me solve these problems, 1-3? and possibly 4 as well, i really need help understading these for my lab!

1. (5 points) How many milligrams of solid MgCl2 (Formula Weight: 95.211g/mole ) are required to prepare 250mL of a 150mM solution? 2. (15 points) If you dissolve 15mg glucose (Formula Weight: 180.16g/mole ) in 15mL of water (all answers must be presented in scientific notation format): a. What is the concentration of glucose in mM and M ? b. If you take 5mL of this solution and dilute it to 150mL what is the concentration of the glucose in the resulting solution in M ? c. How many nanomoles of glucose are present in 10mL of the diluted solution? 3. (5 points) Convert the concentration below to mM and M : a. 154.5mg of sucrose (Formula Weight: 342.30g/mole ) per 300mL 4. (10 points) What molarity of HCl stock solution is needed so that 2.5mL of this stock solution diluted to 0.025L will yield 25mM ? 5. (10 points) You have to make 50mL of 0.05MHCl from a 10MHCl stock solution, but the only measuring devices available are 100mL graduated cylinders and 10mL serological pipets. How could you accurately make the dilute HCl solution (clearly explain)? 6. (25 points) You have a 0.05M stock solution of NaCl (Formula Weight: 58.4g/mole ), a 0.25M stock solution of glucose (Formula Weight; 180.2g/mole ), and a bottle of solid Tris base (Formula Weight: 121.1g/mole ). How would prepare (be specific) 150mL of a single solution containing 75mM Tris, 15mM glucose, and 5mMNaCl. 7. (10 points) Clearly describe how you would prepare 25mL of a 0.15M stock solution of potassium chloride (Formula Weight: 74.55g/mole ). Using this stock solution, describe how you would prepare 5mL of the following dilutions: 15mM and 4500M 8. (10 points) How many micrograms of KMnO4 (Formula Weight: 158.04g/ mole) are contained in 50mL of 125mMKMnO4 (answer must be presented in scientific notation format)? (10 points) What is the molar concentration of potassium chloride (Formula Weight: 74.55 g/mole) in a 25%(w/v) solution