Mass of hydrogen gas released
What is the mass of hydrogen gas released from 2.70 g of aluminum metal and hydrochloric acid?
2 Al(s) + 6 HCl(aq) = 2 AlCl3(aq) + 3 H2(g)
a. 0.303 g
b. 0.202 g
c. 0.606 g
d. 0.101 g
e. 0.135 g
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In an experiment, 6.00 g of Mg(s) was reacted completely with O2(g) to form MgO(s) and 148.5 kJ of heat was evolved. What is the molar enthalpy in kJ/mol of formation of MgO(s)?
The reaction will become more spontaneous. B) The spontaneity of the reaction will not change. C) The reaction will become less spontaneous. D) ?G will decrease. E) K will decrease.
Determine the ionization constant of a 0.0070 aqueous ammonia solution with an OH- concentration of 3.46 x 10^-4 M.
Calculate the pH of a solution made by dissolving 2.89 g of sodium fluoride and 17.1 mL of 0.309 M hydrofluoric acid in enough water to make 177 mL of solution.
Calculate the change in entropy (in J/K) when a 44.0 g of nitrogen gas is heated at a constant pressure of 1.50 atm from 19.3 ºC to 86.5 ºC.
Air at 25°C and 100 kPa has a dew point of 16°C. If you want to remove 50% of the initial moisture in the air (at a constant pressure of 100 kPa), to what temperature should you cool the air
Barium azide is 62.04% Ba and 37.96% N by mass. Assuming that barium exists as its most stable cation in the above compound, what is the molecular formula of barium azide, how many nitrogen atoms compose an azide ion, what is the charge on an azid
A piston has an external pressure of 14.0 . How much work has been done if the cylinder goes from a volume of 0.180 liters to 0.650 liters.
Solid cobalt(II) hydroxide dissociates in water according to the following expression. Co(OH)2(s) Co2+(aq) + 2 OH-(aq) If 1.00 L of saturated Co(OH)2 solution is neutralized by 15.20 mL of 0.00150 M HCl
Lakes that have been acidified by acid rain can be neutralized by liming, the addition of limestone (CaCO3). How much limestone (in kg) is required to completely neutralize a 4.3 billion liter lake with a pH of 5.5?
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