Creatine is a by-product of muscle metabolism, and creatinine levels in the body are known to be a fairly realiable indicator of kidney function. The normal level of creatinine in the blood for adults is aproximatlely 1.0 mg per deciliter of blood. if the density of blood is 1.025 g/ml calculate the molality of a normal creatinine level in a 10.0 blood sample.