Chemistry Answers

10 km distance

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)

250 ml of solution were prepared by dissolving of 2.3 g of the non-electrolyte in water. Calculate the molar mass of solute if the osmotic pressure of solution at 27^oC is equal to 249 Kpa.

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?

A nitrogen sample has a volume of 6 litres at 35 degrees celsius and a pressure of 0,974.What volume will it occupy at STP

This might be a silly question, but hopefully I will be responded.

As far as I know, ions can't exist on their own, and have to bond with another ion, but it seems that they don't have to when it comes to action potential. It's always about a single ion (e.g. sodium ion entering and leaving cell on its own, not bonding to any other ion). How is this possible if an ion can't exist on its own? Am I wrong about this, or this is some kind of exception, or maybe something else?