General Chemistry Answers

A thermite reaction is necessary to produce molten iron. This reaction involves

Fe 3 O 4 and Al and is described by:

8 Al + 3 Fe 3 O 4 → 9 Fe + 4 Al 2 O 3

If 198.5 g Al and 365.5 g Fe 3 O 4 are used, what mass of the excess reagent

remains unused at the end of the reaction?

A metal occurs as body centered cube and has a density of 7.856 g/cm3. calculate the atomic radius of metal. atomic mass of metal is 58 g/ mol. find atomic radius of metal. 

What is the lowest freezing temperature for a saltwater solution? The solubility of sodium chloride (NaCl) is 280g per 1000g of water at 0°C. kf of H2O = 1.86°C/m.

Benzyl amino purine (BAP) stock solution is made as 100mg in 100 ml. How many milliliters of BAP should be used to make 5 liters of MS medium which should contain 10 mg/L BAP.

. A gas with a volume of 4.25 L at a pressure of 215 kPa is allowed to expand

to a volume of 12.13 L. what is the pressure (mmHg) in the container if the

temperature remains constant?

What is the specific heat in J/gC for a metal sample with a mass of 95.6 g which absorbs 841 J of energy when its temperature increases from 30.0 C to 98.0 C.

Calculate the heat lost by the magnesium metal which weighs 6.15 grams and was heated to 98 degrees C. The final temperature when the metal was added to the water is 30 degrees C. Specific heat of magnesium is 1.020 J/gC.

The higher the specific heat of a substance, the more energy required to change its temperature.

mary throws th higanbana with a horizontal velocity of 10.0m/s from th sky 20 m high into the gol post. find th horizontal displacement of the higanbana from the sky.

What mass of oxygen gas, O2, from the air is consumed in the combustion of 702 g of octane, C8H18, one of the principal components of gasoline? 2C8H18 + 25o2 - 16co2 + 18H2o