Hydrogen fuses into helium
Answer: Hsub=Hfus+Hvap
Explanation:
The molar heat of vaporization measured in kilojoules per mole, or kJ/mol is the energy needed to make vapor one mole of a liquid. .
The molar heat of sublimation measured in kilojoules per mole, or kJ/mol is the energy needed to sublime one mole of a solid,
the molar heat of fusion measured in kilojoules per mole, or kJ/mol is the energy needed to melt one mole of a solid.
Hess law helps to explain the relationship in physical chemistry stating that the total enthalpy change during the complete course of a reaction is the same whether the reaction is made in one step or in several steps.
In this context Hess’s law helps to see the several steps involved as the heat of sublimation energy is equal to the sum of vaporization energy and fusion energy.
Answer:
a) Br-, Kr, Sr2+
Explanation:
plus and minus sort of mean opposite here
Br has 35
Br- has 36
Sr has 38
Sr2+ has 36
Kr has 36
in which of the following sets do all species have the same number of electrons (isoelectronic)?
a) Br-, Kr, Sr2+
b) C, N3-, O2-
c) Mg2+, Sr2+, Ba2+
d) O, O2-, O2+
Mg2+ has 10
Sr2+ has 36
Ba2+ has 54
Br- has 36
Kr has 36
Sr2+ has 36
C has 6
N3- has 10
O2- has 10
O has 8
O2+ has 6
toppr
Answer:
Explanation:
3BaCl₂(aq) + 2Na₃PO₄(aq) = Ba₃(PO₄)₂ + 6NaCl(aq)
3 x 208 g = 624 g 2 x 164 g = 328 g
328 g of Na₃PO₄ reacts with 624 g of BaCl₂
.611 g of Na₃PO₄ reacts with 624 x .611/328 g of BaCl₂
624 x .611/328 g = 1.16 g of BaCl₂
BaCl₂ available is .504 g which is less than required .
Hence BaCl₂ is limiting reagent .