Answer:
Q = 7898.38 J = 7.898 KJ
Explanation:
∴ ΔHv H2O = 47 KJ/mol = 47000 J/mol
∴ molar mass H2O = 18.015 g/mol
⇒ ΔHv H2O = (47000 J/mol)*(mol/18.015 g) = 2608.94 J/g
∴ m H2O = 2.73 g
⇒ ΔHv H2O = (2.73 g)(2608.94 J/g) = 7122.406 J
∴ C H2O = 4.18 J/g°C
∴ ΔT = 100 - 32 = 68°C
⇒ Q = (2.73 g)(4.18 J/g°C)(68°C) + 7122.406 J
⇒ Q = 775.975 J + 7122.406 J
⇒ Q = 7898.38 J
I think it's 4 but I am not even 50% sure... But I think that is the answer..
The energy to vaporize the water at its normal boilng point (100°C) is the vaporization latent heat.
The vaporization latent heat of water is 2257 J/ g (you can find it in a textbook, tables or internet).
So, with 955 kJ you can vaporize this amount of water:
[995 kJ * 1000J/kJ ] / 2557 J /g = 389.13 g
Use the density to convert to volume: D = M / V => V = M / D
V = 389.13 g / 1.00 g / ml = 389.13 ml, which rounded to 3 significant figures is 389 ml
Answer: 389 ml
The 2 types of mechanical weathering are .....
1) * Temperature Change
-Temperature change makes rocks contract and expand
-Also one of the important cause of mechanical weathering.
2) * Abrasion
-Abrasion is a process in which an external force
Example: water movement or gravity which causes rock materials grind (reduce <<< synonyms) which can break apart the outer layers of affected rocks.*PLEASE GIVE THIS A THANKS :) :D xD AND ALSO THE BRAINIST ANSWER PREETTY PLEASEEEEEEEE, DON'T YOU EVER FEEL LIKE YOUR GOOOOING TO GIVE ME THE BRAINIEST ANSWER/CROWN??? xD
Answer:
C. hydrocyanic acid
Explanation:
The mixture of a weak acid (As hydrocyanic acid, HCN), with its conjugate base (Na⁺CN⁻) produce a buffer effect in the solution due the equilibrium:
HCN ⇄ CN⁻ + H⁺
Now, when NaOH (A base) is added to the mixture, the reaction with <em>HCN </em>is:
NaOH + HCN → Na⁺CN⁻ + H₂O
As the OH⁻ of NaOH are not affecting directly the H⁺ concentration, <em>the pH does not increase dratically.</em>
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Right answer is:
<em>C. hydrocyanic acid
</em>