The molecular mass of ammonia (NH3) is 17 and the normal range in plasma of ammo

Question

The molecular mass of ammonia (NH3) is 17 and the normal range in plasma of ammonia is 10-50 ug/dL. What is this normal range expressed as umol/L?

1-3 umol/L

6-29 umol/L

60-290 umol/L

220-700 umol/L

explain please

The molar absorptivity constant for solution X at 600nm = 10,000. Molecular weight of X is 500. A bottle containing 5.0mg/L of solution X reads 0.090 in a spectrophotometer with a 1 cm light path. Calculate the deviation or percent error of this solution as compared with its theoretical absorbance

-10%

-5%

0%

5%

10%

also

2 mL of a 1/20 dilution is to be made from a urine sample, using saline as a diluent. How much urine is necessary to make this dilution?

A calcium (Ca++) concentration of 4.0 mg/dL is equivalent to which of the following mEq/L concentrations? (Atomic mass of calcium ion = 40.08)

1.0 mEq/L

2.0 mEq/L

3.0 mEq/L

4.0 mEq/L

1-3 umol/L

6-29 umol/L

60-290 umol/L

220-700 umol/L

Explanation / Answer

micro = 10-6, deci = 10-1

10-50 ug/dL = 10-50 *10-6g/10-1L = 10-50 *10-5/17 mole/L = 10-50 *10/17 u mole/L = 5.8- 29.4 umol/L

so aproximatly answer b. 6-29 umol/L is correct

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