The healthcare provider (HCP) prescribes diazepam 8 mg IM every 4 hours PRN muscle spasms for a client with a fractured femur. The available vial is labeled, "Diazepam Injection, USP 10 mg/2 mL." How many mL should the nurse administer to the client? (Enter numerical value only. If rounding is required, round to the nearest tenth).