(a) Consider the hypothetical element X. XO reacts with hydrogen gas to form XH;OH. Calculate the enthalpy of this reaction given that: (1) the enthalpy change that occurs when X reacts with oxygen gas to form XO is -221.0 kJ (ii) the enthalpy change that occurs when X reacts with oxygen gas and hydrogen gas to form XH;OH is -402.4 kJ.

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(a)
Consider the hypothetical element X.
XO reacts with hydrogen gas to form XH;OH. Calculate the enthalpy of this reaction given that:
(i) the enthalpy change that occurs when X reacts with oxygen gas to form XO is -221.0 kJ
(ii) the enthalpy change that occurs when X reacts with oxygen gas and hydrogen gas to form
XH,OH is -402.4 kJ.
Calculate the distance between the centers of Y²* and Z² ions in a YZ lattice given that when
3.6 g of the compound are formed from its gaseous ions, 3.8 kJ of energy are released. The
proportionality constant, k = 8.01 x 101" J pm. Molar mass of YZ: 257 g moľ'
(b)
(c)
When a sample of vanadium metal absorbs 353 kJ of energy, the 'd' electrons of the metal atoms
undergo a transition from their ground state to the fifth electron shell. Calculate the mass of this
metal sample.
Transcribed Image Text:(a) Consider the hypothetical element X. XO reacts with hydrogen gas to form XH;OH. Calculate the enthalpy of this reaction given that: (i) the enthalpy change that occurs when X reacts with oxygen gas to form XO is -221.0 kJ (ii) the enthalpy change that occurs when X reacts with oxygen gas and hydrogen gas to form XH,OH is -402.4 kJ. Calculate the distance between the centers of Y²* and Z² ions in a YZ lattice given that when 3.6 g of the compound are formed from its gaseous ions, 3.8 kJ of energy are released. The proportionality constant, k = 8.01 x 101" J pm. Molar mass of YZ: 257 g moľ' (b) (c) When a sample of vanadium metal absorbs 353 kJ of energy, the 'd' electrons of the metal atoms undergo a transition from their ground state to the fifth electron shell. Calculate the mass of this metal sample.
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