Answer : The amount of heat needed to decompose 996 g of the oxide is, 416.8 kJ
Explanation : Given,
Mass of 
= 996 g
Molar mass of = 216.59 g/mol
First we have to calculate the moles of HgO.
Now we have to calculate the heat required.
The balanced chemical reaction is:
From the given chemical reaction we conclude that,
As, 2 moles of HgO required heat for decomposition = 181.6 kJ
So, 4.59 moles of HgO required heat for decomposition = 
Therefore, the amount of heat needed to decompose 996 g of the oxide is, 416.8 kJ
To determine the Keq, we need the chemical reaction in the system. In this case it would be:
CO + 2H2 = CH3OH
The Keq is the ration of the amount of the product and the reactant. We use the ICE table for this. We do as follows:
CO H2 CH3OH
I .42 .42 0
C -0.13 -2(0.13) 0.13
-----------------------------------------------
E = .29 0.16 0.13
Therefore,
Keq = [CH3OH] / [CO2] [H2]^2 = 0.13 / 0.29 (0.16^2)
Keq = 17.51
Answer:
The percent of mass of GaBr₃ in the solid mixture is 30.2 %.
Explanation:
GaBr₃(aq) + 3 AgNO₃(aq) ⟶ 3 AgBr(s) + Ga(NO₃)₃(aq)
MW GaBr₃ = 309.4 g/mol
MW AgBr = 187.8 g/mol
187.8 g AgBr _______ 1 mol
0.368 g AgBr _______ x
x = 2.0 x 10⁻³ mol AgBr
1 mol GaBr₃ ____ 3 mol AgBr
y ____ 2.0 x 10⁻³ mol AgBr
y = 6.7 x 10⁻⁴ mol GaBr₃
1 mol GaBr₃ ____________ 309.4 g
6.7 x 10⁻⁴ mol GaBr₃ ______ w
w = 0.206 g GaBr₃
0.6813 g _____ 100%
0.206 g _____ z
z = 30.2 %
Answer:
At the completion of reaction.
Explanation:
The time when the reaction take places is the most significant time for measuring temperature of the solution because on this time the temperature will decrease or increase. Some reactions releases heat energy upon completion we called them exothermic reactions whereas some absorb heat energy from the surrounding, decreases the temperature which is known as endothermic reaction so measuring temperature at the completion of reaction is the correct time.
5 plates is the highest amount that can be served
There’s only 5 sandwiches so 7 is automatically ruled out, there’s 14 corn cobs and 5 sandwiches only need 10 so it works out
