1. A physician ordered 2.0 milligrams tetracycline to be given to a patient. If the tetracycline was available as 0.75 mg/mL of
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Answer :
(a) The given number in 2 significant figures will be,
(b) The given number in 4 significant figures will be,
(c) The given number in 3 significant figures will be,
Explanation :
Significant figures : The figures in a number which express the value -the magnitude of a quantity to a specific degree of accuracy is known as significant digits.
(a) The given number 00003554 converted into 2 significant figures.
In 00003554, there are 4 significant figures. Now we have to convert it into 2 significant figures.
The given number in 2 significant figures will be,
(b) The given number 35.8348 converted into 4 significant figures.
In 35.8348, there are 6 significant figures. Now we have to convert it into 4 significant figures.
The given number in 4 significant figures will be,
(c) The given number 22.4555 converted into 3 significant figures.
In 22.4555, there are 6 significant figures. Now we have to convert it into 3 significant figures.
The given number in 3 significant figures will be,
The enthalpy change of the reaction when sodium hydroxide and sulfuric acid react can be calculated using the mass of solution, temperature change, and specific heat of water.
The balanced chemical equation for the reaction can be represented as,
Given volume of the solution = 101.2 mL + 50.6 mL = 151.8 mL
Heat of the reaction, q = Δ
m is mass of the solution = 151.8 mL *
C is the specific heat of solution = 4.18
ΔT is the temperature change =
q =
Moles of NaOH = NaOH
Moles of =
Enthalpy of the reaction =