General Chemistry Answers

A sample of magnesium is reacted with 4.0 g of sulfuric acid.

How many moles of magnesium would react completely?

 I am a crystalline solid in which none of the unit cell parameters are same. Who am I?

Wet hydrogen with 4% water was completely burned in a furnace with 32% air plus, calculate the percentage of gas leaving the furnace

1. You have ice at 263 K (-10.0^oC) and 1.0 atm. What could you do to make the ice sublime?

2. A sample of dry ice (solid CO₂) is cooled to 173 K (-100.0^oC) and is set on a table at room temperature (298 K; 25^oC). At what temperature is the rate of sublimation and deposition the same (assume that pressure is held constant at 1 atm)?

Calculate the ΔH for the reaction: CS₂ (l) + 2 O₂ (g) 🡺 CO₂ (g) + 2 SO₂ (g)

1. Calculate the heat of hydrogenation of ethane (C₂H₆) given the following thermochemical equations:

a. 2 C (graphite) + 3 H₂ (g) 🡺 C₂H₆ (g)      ΔH_f^o = - 84.5 kJ/mol

b. 2 C (graphite) + 2 H₂ (g) 🡺 C₂H₄ (g)      ΔH_f^o =   52.3 kJ/mol

Inquiry in Action:

1. People who live in colder climates have seen the trucks put or sprinkle salt on the roads when snow or ice is forecast. Why do they do that?

2. When planes fly in cold weather, the planes need to be de-iced before liftoff. Why is that done?

1. You have ice at 263 K (-10.0^oC) and 1.0 atm. What could you do to make the ice sublime?

2. A sample of dry ice (solid CO₂) is cooled to 173 K (-100.0^oC) and is set on a table at room temperature (298 K; 25^oC). At what temperature is the rate of sublimation and deposition the same (assume that pressure is held constant at 1 atm)?

A sample of a gas expands from 2.00 L to 3.50 L against a constant pressure of 1.0 atm. Calculate the work done in joules. (1 L.atm = 101.3 J)

A.  1.50 J

B.  +152 J

C.  -152 J

D.   481 J

What is the mass of 8.72x10^21 karakin molecules,