Answer:
Partial pressure of 
in the gas was 733 torr and mass of 
in the sample was 2.12 g.
Explanation:
a) Total pressure of gas = (partial pressure of water vapour)+(partial pressure of )
Here partial pressure of water vapour is 21 torr and total pressure of gas is 754 torr.
So, partial pressure of = (total pressure of gas)-(partial pressure of water vapour) = (754 torr) - (21 torr) = 733 torr
b) Lets assume that behaves ideally. Hence-
PV=nRT
where P is pressure of , V is volume of , n is number of moles of , R is gas constant and T is temperature in kelvin
here P = 733 torr = 
= 0.9646 atm
V = 0.65 L, R = 0.082 L.atm/(mol.K), T=(273+22)K = 295 K
So, 
= 
= 0.0259 moles
As 3 moles of are produced from 2 moles of therefore 0.0259 moles of are produced from 
moles or 0.0173 moles of .
Molar mass of = 122.55 g
So mass of in sample = 
= 2.12 g
Answer: The answer is C
covalent bonds have a lower melting and boiling point
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Answer:
There's good reason why vitamin D is called “the sunshine vitamin.” When your skin is exposed to sunlight, it makes vitamin D from cholesterol. The sun's ultraviolet B (UVB) rays hit cholesterol in the skin cells, providing the energy for vitamin D synthesis to occur.
Explanation:
Answer: The chemical formula for barium chloride shows the number of ATOMS of each element in the SMALLEST representative unit of the substance.
Explanation:
The chemical formula of compound are ways in which a chemical substance is being expressed using chemical symbols to show types of atoms and subscripts to indicate the number of atoms of each element. It shows the number of atoms in a single ( smallest) representative unit of the substance. Using the compound BaCl2;
"Ba" represents the abbreviation for the element "Barium" while "Cl2" represents the abbreviation for the element "chloride" with the subscript of two indicating the number of atoms of chlorine.
There are steps to be considered while writing a chemical compound of a substance, they include:
--> write the symbol of all the elements that forms the compound ( Ba and Cl).
--> write the valency of each element. (Ba has 2 valence electrons while Cl has 1 valence electron).
--> exchange the valency of the both elements such that Ba bears valency of 1 and Cl bears valency of 2 electrons.
--> finally, write the valency of second atom as subscript of first and Write valency of first atom as subscript of second. You will achieve BaCl2 as your chemical formula.
Answer:
pH = 11.30
Explanation:
pH is defined as -log [H⁺]
To find [H⁺] from [OH⁻] -Concentration of hydroxide ion-, we must use the equilibrium of water:
H₂O(l) ⇄ H⁺(aq) + OH⁻(aq)
Keq = 1x10⁻¹⁴ = [H⁺] [OH⁻]
[H⁺] = 1x10⁻¹⁴ / [OH⁻]
[H⁺] = 1x10⁻¹⁴ / 2x10⁻³M
[H⁺] = 5x10⁻¹²M
pH = -log (5x10⁻¹²M)
<h3>pH = 11.30</h3>
