General Chemistry Answers

At 50.° C the vapor pressure of ethanol is 0.30 atm, acetic acid is 0.08 atm, and water is 0.12 atm.

A.Arrange these substances in decreasing order of viscosity forces.

B.Arrange these substances in increasing order of surface tension.

A building’s 10th floor (34.5 m high) is blazing with fire. A fire truck arrived at the scene and the fire men shoots water from their hose. The water leaves the hose at the speed of 29 m/s, at an angle of 63° and is held at 0.90 m from the ground. Will the water reach the fire? If so, how far from the building should the hose be so the fire could be put out? 

How many moles of water are needed to react with 10.0 mol of o2

What volume of NO2 measured at 0.95 atm and 25 oC would be produced from the reaction of 3 pennies with excess HNO3?

frequency is 6.00 x 1014 s-1

120 X 4.184 X (T - 18) + 300 X 0.30 X (T - 18)

On earth, tin has 10 different stable isotopes. The heaviest, \ce{^{124}Sn}

X

124

​X

2

2

124

​Sn makes up 5.80\%

5.80% of naturally occurring tin atoms. How many atoms of \ce{^{124}Sn}

X

124

​X

2

2

124

​Sn are present in 18.3

18.3 g of a natural sample of tin?

Considering \ce{^{124}Sn}

X

124

​X

2

2

124

​Sn has an isotopic mass of \ce{{123.905} amu}

123.905 amu , calculate the mass of this isotope in the sample.

The carbon in coal can be converted into methane, CH4, by first heating the coal powder with steam and oxygen, followed by heating with carbon monoxide and hydrogen. The overall process is summarized below.

C(s) + 2 H2(g)  →  CH4(g)

When 10.0 kg of coal is used in the process, 4.20 kg of methane is produced. What is the percentage yield of methane, assuming the coal is pure carbon?