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A sample of hydrogen gas has a pressure of 5.9 atm and a temperature of 290 K. After being cooled to temperature 200 K, what is the new pressure?
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In a closed container, the temperature is decreased by 50%. Which of the following will happen to the gas inside the container?
10g of hydrated calcium tetraoxosulphate(vi) [CaSO4.xH2O] weigh 7.90g after heating and cooling.calculate the emprical formular of the compound.
The thermite reaction is spectacular and exothermic. Iron(III) oxide, Fe2O3, and metallic aluminum produce molten iron and aluminum oxide in a few seconds, according to the equation(/4):
Fe2O3(s) + 2 Al(s) → Al2O3(s) + 2 Fe
(a) Given the following, calculate ΔH for the thermite reaction. Show your work. 2 Al(s) + O2 (g) →Al2O3(s) ΔH = -1670 kJ
2 Fe(s) + O2 (g) → Fe2O3(s) ΔH = - 822 kJ
(b) How much heat energy will be released when 1000.0 g of iron is produced by this reaction(/4)?
The thermite reaction is spectacular and exothermic. Iron(III) oxide, Fe2O3, and metallic aluminum produce molten iron and aluminum oxide in a few seconds, according to the equation(/4):
Fe2O3(s) + 2 Al(s) → Al2O3(s) + 2 Fe
(a) Given the following, calculate ΔH for the thermite reaction. Show your work. 2 Al(s) + O2 (g) →Al2O3(s) ΔH = -1670 kJ
2 Fe(s) + O2 (g) → Fe2O3(s) ΔH = - 822 kJ
X has a molar mass of 46.31, what is the percentage composition by mass of X in X3PO4?
Based on the following equation what is the heat of formation, ΔHf°, for H2O(l)
2H2(g)+O2(g)=2H2O(l)+136.6kcal
14. What volume of gas will be produced when 35.0 g of calcium reacts with excess hydrochloric acid at SATP?
Calculate the hydronium ion concentration of a solution with a pH of -1.07
For alanine, Ka1 = 5.1 x 10 -3, Ka2 = 1.8 x 10 -10
a) Calculate the ratios [Z] / [C
+] and [Z] / [A
−] at pH = 10.50
b) Calculate the pH when [Z] = [C
+] and when [Z] = [A
−] if pH= - log [H
+]
