Based on these percentages it is most likely 43% based on the ratio of the two elements.
Physical science. I'm just kidding. they study physical properties and energy
Solution:
Potassium nitrate has a lattice energy of -163.8 kcal/mol and a heat of hydration of -155.5 kcal/mol.
Therefore,
Latice Energy: K⁺(g) + NO₃⁻(g) → KNO₃(s) . . . ∆H = –163.8 kcal/mol
Hydration:
K⁺(g) + NO₃⁻(g) + excess H₂O → K⁺(aq) + NO₃⁻(aq) . . . ∆H = –155.5 kcal/mol
Flip the first equation and add them together:
KNO₃(s) + excess H₂O → K⁺(aq) + NO₃⁻(aq) . . . ∆H = +8.3 kcal/mol = +34. 73 kJ/mol
(110kJ)/(34. 73 kJ/mol) = 3.16729 mol must be dissolved to absorb 110 kJ
Answer:
Empirical formula of ibuprofen :
Molecular formula of ibuprofen :
Explanation:
Let the empirical formula of ibuprofen be =
Considering 100 gram of ibuprofen with 75.69% C, 8.80% H, and 15.51% O.
Mass of carbon =
Moles of carbon =
Mass of hydrogen =
Moles of hydrogen =
Mass of oxygen =
Moles of oxygen =
For empirical formula, divide the lowest value of moles from each moles of element present in the compound.
Carbon =
Hydrogen =
Oxygen =
Empirical formula of ibuprofen :
Molecular mass = n × empirical mass
Empirical mass of ibuprofen=
Molecular mass of ibuprofen = 206 g/mol
206 g/mol = n × 206 g/mol
n = 1
Molecular formula =
Molecular formula of ibuprofen :
=
2H2 + O2 \rightarrow 2H2O
PV = nRT
since assuming that the reactants and product are all at the same temperature and pressure, the molar ratio of reactants = volume ratio of reactants.
The chemical reaction between Hydrogen and oxygen is as follows:
2H2 + O2 ---> 2H2O
2.......1........2 (volume ratio = molar ratio at same condition of temperature and pressure)
Given that
oxygen volume = 22.5L
Volume of H2O =22.5 L volume oxygen * 2 volume H2O / 1.0 L volume oxygen
= 45 L water