General Chemistry Answers

In terms of heat flow, explain briefly:

1) Why silverware feels cold to touch

2) Why you feel cool after alcohol is rubbed on your skin

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1.     Based on THE REACTION BELOW – Using the amount of fuel you calculated in grams to get you from school and back, how many grams of Carbon Dioxide is produced if there is an unlimited supply of oxygen? This reaction is assuming that your car burns fuel in a complete combustion reaction… which it probably doesn’t.. but do it anyways…

2 C₈H_{18 (g)}  + 25 O_{2 (g)}  à 16 CO_{2 (g)}  + 18 H₂O _(g)

 ₂.     Based on THE REACTION BELOW – Generally cars burn fuel with an unlimited supply of oxygen gas in the atmosphere. Assuming for some silly reason there was only 10.00 grams of oxygen available. Your car would stop working when the oxygen runs out, but that would be the least of your worries! Based on the amount of fuel you calculated at the start, and the 10.00g of oxygen, how many grams of water would be produced?

2 C₈H_{18 (g)}  + 17 O_{2 (g)}  à 16 CO _(g)  + 18 H₂O _(g)

3.     Based off what happened above, how much gas in grams would be NOT used due to the lack of oxygen (solve for excess C₈H₁₈ in grams)

1. In the reaction Mg(OH)2 + 2HCl → MgCl2 + 2H2 O, you were given 15

grams of Mg(OH)2 and 25 grams of HCl. Which of the two reactants is the

limiting reagent? How much MgCl2 will be produced in the reaction? (Mg(OH)2

= 58.32 g/mol, HCl = 36.46 g/mol, MgCl2 = 95.32 g/mol)

. Calculate the percent by mass of sodium hypochorite in her disinfectant solution. (

5Tbsp. of NaClO (sodium hypochlorite) and 3.8 liters of H2O (water). In units of grams

for both of the solute and solvent.

Based on the below reaction, how many moles of CO₂ will be produced if 14.45 moles of O₂ react completely with excess C₃H₈? Round your answer to 2 places after the decimal. You do not need to include units.

C₃H₈ + 5O₂ --> 3CO₂ + 4H₂O

Based on the below reaction, how many moles of NH₃ will be produced, if 28.23 moles of H₂ react completely with excess N₂? Round your answer to 2 places after the decimal.

N₂ + 3H₂ --> 2NH₃

Based on the below reaction, how many moles of N₂ are need to react completely with 10.42 moles of H₂? Round your answer to 2 places after the decimal.

N₂ + 3H₂ --> 2NH₃

1. In a 35.0 L automobile air bag, a sample of gaseous nitrogen has a pressure of 745 mm Hg. If this

sample is transferred to a 25.0 L bag at the same temperature, what is the final pressure of the gas?

Considering the reaction 2H2(g) +2H2 O(g). Calculate the volume of unused oxygen gas when 40cm³ of hydrogen gas is sparked with 30cm³ of oxygen gas

(b) calculate carbonate of mass 1.0g was heated until there was no further change.

(c). Write an equation for the reaction which took place

(d) calculate the mass of the residue

(e). Calculate the volume of the gas evolved at STP.

(f). What will be the volume of the gas measured at 15°c and 760mm Hg?(C=12.0, O=16, Ca=40.0, Molar mass volume of a gas at STP= 022.4dm³)