Creatinine, , is a by-product of muscle metabolism, and creatinine levels in the body are known to be a fairly reliable indicator of kidney function. the normal level of creatinine in the blood for adults is approximately 1.0 mg per deciliter (dl) of blood. if the density of blood is 1.025 g/ml, calculate the molality of a normal creatinine level in a 60.0-ml blood sample.

Answer;

Molarity = 88.25 μmol/L

Explanation;

The creatinine has a concentration of 1 mg / deciliter or 10 mg / liter of blood.

( 1 dL = .1L)  

note; we don't need the volume of the sample  

1 liter of blood weighs 1025 g so mg creatinine / kg of blood

= 10 x 1000 / 1025 = 9.756 mg creatinine / kg of blood  

Molecular weight of C4H7N3O is 113.12 g/mol  

moles of creatinine = 9.756 / 113.12 = 0.0862 / kg  

molality of the creatinine in blood = 8.62 X 10 ^ -5 mol / Kg of blood  

or 86.2 x 10 ^ -6 mol / kg or 86.2 μmol/ Kg  

86.1 * 1.025 μmol/ L = 88.25μmol/ L

Molarity = 88.25 μmol/L

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.