Answer:
The percentage concentration (w/v) of phenylephrine in the injection is 1 %.
Explanation:
The percentage concentration in w/v of the phenylephrine hydrochloride can be calculated as follows:
Where:
m: is the mass of the solute in grams
V: is the volume of the solution in milliliters
The concentration of the phenylephrine hydrochloride is 10 mg/mL, so the percentage concentration is:
Therefore, the percentage concentration (w/v) of phenylephrine in the injection is 1 %.
I hope it helps you!
C Sometimes have a positive effect on an organism EX: The organism has a mutation that causes the bird to have a longer beak.
Answer:
4
Explanation:
The balanced equation for the reaction is as follows:
4Al + 3O2 --> 2(Al2O3)
Nitric acid is HNO3 while Calcium Hydroxide is a base with a chemical formula Ca(OH)2. When acid reacts with base, it forms salt and water (H20). Hence forming the equation HNO3 + Ca(OH)2 -> Ca(NO3)2 + H20.
To gain the same number of atoms on both sides, the balanced molecular equation should be:
2NO3 + Ca(OH)2 -> Ca(NO3)2 + 2H2O
with: 4 Hydrogen, 2 Nitrogen, 8 Oxygen, and 1 Calcium
The delta H of -484 kJ is the heat given off when 2 moles of H2 react with 1 mole of O2 to make 2 moles of H2O. You don't have anywhere near that much reactants, only 1/4 as much
<span>actual delta H = 0.34 moles H2 x (-484 kJ / 2 moles H2) = 823 kJ </span>
<span>delta E = delta H - PdeltaV = 823 kJ - 0.41 kJ = 822 kJ</span>
