General Chemistry Answers

A piece of metal with a mass of 80.0 grams is placed in a freezer over night. The metal is then placed in a double lined Styrofoam cup with a lid that contained 150.0 grams of water. The initial temperature of the water is 20.0 ^o C. The freezer was set to -2.00 ^o C. After the metal was placed in the cup the final constant temperature of the water was 15.0 ^o C. What is the specific heat of the metal _________ J/gC? 

The compound ammonium nitrate is a strong electrolyte. Write the reaction when solid ammonium nitrate is put into water.

Include states of matter in your answer.

Gaseous methane CH4  will react with gaseous oxygen O2 to produce gaseous carbon dioxide CO2 and gaseous water H2O. Suppose 6.3 g of methane is mixed with 15.0 g of oxygen. Calculate the maximum mass of water that could be produced by the chemical reaction. Round your answer to 3 significant digits.

Ferro chloride reacts with silver nitrate, AgNO3 to form ferric nitrate, Fe(NO3)3 and silver chloride, AgCl

(a) A laser spectroscopist produces benzene clusters by seeding benzene within helium in a supersonic expansion. Benzene and helium are mixed within a gas cylinder and stored in a lab at 22 °C. What are the relative speed of the benzene molecules and helium atoms within the cylinder? [4 marks]

1.35g of aluminum powder and 8.0 g of copper (II) oxide were used in excess and heated vigorously in the laboratory to produce aluminum oxide and copper.

Calculate the mass of copper (ii) oxide not used in the reaction.

The depletion of ozone (O3) in the stratosphere has been a matter of great concern among scientists in recent years. It is believed that ozone can react with nitric oxide (NO) that is discharged from the high altitude jet plane, the SST. The reaction is

O3+NO product> O2+NO2

If 0.740 g of O3 reacts with 0.670 g of NO, how many grams of NO2 will be produced? Which compound is the limiting reagent? Calculate the number of moles of the excess reagent remaining at the end of the reaction.

Task: Answer the following use separate paper to compute your answer.

1. What is the mass in grams of 3.61 x 1022 atoms of

Xe c. Au e. K

N d.Sc

2. Find the mass of 0.25 moles of the following substances

K2CrO4 c. SiH4

CH4 d. AlPO4 e. Ba(OH)2

3. How many moles are in 250 grams of

PbSO4 c. CH3CHO

Fe2O3 d. CH3CH2OH

4. Calculate the mass in grams of one molecule of

Bromine, Br c. Water, H2O

Sulfur, S8 d. Carbon disulfide, CS3

5. The gem emerald is a pure crystal of the mineral beryl, Be3Al2(SiO3)6 How many atoms of beryllium would be in 134.35 grams of beryl?

6. Which among the following amounts contains the most number of atoms?

a. 2.0 grams of potassium metal

b. 0.3 moles of hydrogen atoms

c. 1.204 x 1021 atoms of sulfur

d. 1.27 grams of iodine

7. What is the mass of oxygen combine with 15.76 g of gold in a sample of gold oxide, AuO2?