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A system absorbs 50J of heat during a transformation. Determine the change in internal energy if the system perform, (a) 15J and (b) 65J of work on the surrounding.
Determine the Oxidation State of the highlighted element below.
H₂ PO₄-
Solution:
Given the following thermochemical equations:
1.) 4NH3(g) + 302(g) → 2N2(g) + 6H₂0(l) ∆H°-1531 kJ
2.) N₂O(g) + H₂(g) → N2(g) + H₂O (l) ∆H°-367.4 kJ
3.) H₂(g) + O2(g) → H₂0(l)
∆H°= -285.9 kJ
Find the value of ∆H° for the reaction:
2NH3(g) + 3N₂O(g) → 4N₂(g) + 3H₂0 (l)
A crucible containing an unknown mass of magnesium weighs 37,63 if the mass of the empty crucible was found to be 32.83 determine the number of moles of magnesium
A crucible containing an unknown mass of magnesium weighs 37,63 if the mass of the empty crucible was found to be 32,83.determine the number of moles of magnesium
Derive the Henderson-Hasselbalch equation using a weak acid ethanoic
acid.
A sample of oxygen gas occupies a volume of 7.93 L at 59 °C and 843 mm Hg. The volume of the gas sample increases to 8.96 L while its pressure increases to 1.13 x 10^3 mm Hg. If the ideal gas law is obeyed, the temperature of the gas sample at the new volume and pressure is _____ °C.
A. A sample of helium gas at a pressure of 0.774 atm and a temperature of 259 °C, occupies a volume of 512 mL. If the gas is heated at constant pressure until it’s volume is 745 mL, the temperature of the gas sample will be _______ °C.
B. A sample of krypton gas at a pressure of 964 mm Hg and a temperature of 38 °C, occupies a volume of 13.8 liters. If the gas is cooled at constant pressure to a temperature of 8°C, the volume of the gas sample will be ______ L.
B. A sample of neon gas at a pressure of 0.996 atm and a temperature of 28.9 °C, occupies a volume of 18.5 liters. If the gas is allowed to expand at constant temperature to a volume of 25.7 liters, the pressure of the gas sample will be ______ atm.
A. A sample of oxygen gas at a pressure of 0.986 atm and a temperature of 23.3 °C, occupies a volume of 563 mL. If the gas is compressed at constant temperature until it’s pressure is 1.47 atm, the volume of the gas sample will be ______ mL.
