Answer: 274.75 mL
Explanation:
Initial volume of gas V1 = 250.0 mL
Initial temperature of gas T1 = 30.0 C
Convert temperature in Celsius to Kelvin
(30.0°C + 273 = 303K)
New volume V2 = ?
New temperature T2 = 60.0 C
(60.0°C + 273 = 333K)
Since, volume and temperature are involved while pressure is constant, apply the formula for Charles law
V1/T1 = V2/T2
250.0 mL/303K = V2/333K
Cross multiply
250.0 mL x 333K = 303K x V2
83250 = 303V2
V2 = 83250/303
V2 = 274.75 mL
Thus, the volume will be 274.75 mL
Below is the list of enthalpies of formation of the compounds involved in the chemical reaction.
HCl: -92.3 kJ/mol
H2: 0
Cl2: 0
Both H2 and Cl2 do not have enthaply of formation because they are pure substances.
Since, in the reaction there are 2 moles of HCl,
Enthalphy of formation = enthalpy of products - enthalphy of reactant/s
= 0 - (-92.3)(2) = +184.6 kJ
Hence, the answer is the first choice.
Answer:
Option B is correct.
The net ionic chemical reaction when Cu(NO₃)₂ reacts with water is
Cu²⁺(aq) + H₂O(l) ⇌ Cu(OH)¹⁺(aq) + H¹⁺(aq)
Explanation:
When ions dissolve in polar solvents (in water especially), then often attract ions of opposite signs.
Cu(NO₃)₂ dissolves into Cu²⁺ & NO₃⁻ and water contains H¹⁺ & OH⁻
The Cu²⁺ attracts the OH⁻ from water, thereby giving the Cu(OH)¹⁺ ion (with a net charge of +2-1 = +1) and the NO₃⁻ takes up the H⁺ ion.
Could I hear the options..