Density

A cube of material with a length of 0.044 m and mass of 10.00 X 10 to the negative 1 power kg. What is the density (g/mL)?

Conversion

A unit of mass termed the dog is defined by the relationship 21.00g = 1.00 dog. If an object weighed 100,000 kg, how many dogs would this pertain to? Also, convert dogs to cats (i.e., 1.00 dog = 10.25 cats).

Calculating number of Nitrogen atoms

How do you do this problem? What is the number of nitrogen atoms contained in 9.40 g of N2O3.

Density question with finding the number of atoms in Iron

The Density is 7.87g/cm^3 , and the average mass for a single iron atom is 9.28*10^-23g . How many iron atoms are present in a iron bar whose dimensions are 2.00 cm * 3.00 cm * 8.00 cm ?

Calculating Relative Humidity

A closed vessel contains moist air at 20 degree celcius, the relative humidity being 30 %. What would be the relative humidity become if the vessel were cooled to 10 degree celcius ? SVP of watyer at 20 deg celcius = 17.5 mm SVP of water at 10 deg celcius = 9.2 mm

Avagadro number

How do you do this problem? What is the number of nitrogen atoms contained in 9.40 g of N2O3

Atomic masses: relative abundance

The element Europium exists in nature as two isotopes: 151Eu has a mass of 150.9196 amu, and 153Eu has a mass of 152.9209 amu. The average atomic mass of europium is 151.96 amu. Calculate the relative abundance of the two europium isotopes.

Find mass percent of Tl2SO4 ???????

The thallium (present as Tl2SO4) in a 7.80-g pesticide sample was precipitated as thallium(I)iodide. Calculate the mass percent of Tl2SO4 in the sample if 0.890g of TlI was recovered.

How many kilometers can you walk after eating 120 g of glucose ?

The enthalpy change involved in the oxidation of Glucose is -2880 kJ/mol. 25 % of the energy is available for muscular work. If 100 kJ of muscular work is needed to walk one kilometer, what is the maximum distance that a person will be able to walk after eating 120 g of glucose ?

Balancing an equation...

Write the stoichiometric equation for magnesium nitride plus water yields magnesium hydroxide and ammonia gas.