|Grams, Moles and Molar
|1.||What is the mass of 0.100 mol of each of the substances given below:|
|(a) Sodium carbonate, Na2CO3|
|(b) Ammonium tetraborate, (NH4)2B4O7|
|(c) Calcium cyclamate, Ca(C6H12NSO3)2
|2.||How many moles of sodium nitrate are in 1.70 grams of sodium nitrate, NaNO3, a substance used in fertilizers and to make gunpowder.|
|3.||Ammonium sulphate, (NH4)2SO4,
is a fertilizer used to supply both nitrogen and sulphur. How many
grams of ammonium sulphate are in 35.8 moles of (NH4)2SO4.
|4.||A 0.500 mol sample of table sugar, C12H22O11,
weighs how many grams?
|5.||A solution of zinc chloride, ZnCl2, in
water is used to soak the ends of wooden fenceposts to preserve them from
rotting while they are stuck in the ground. One ratio used is 840 grams ZnCl2
to 4 L water. How many moles of ZnCl2 are in 840 grams of ZnCl2?
|6.||In the early 1970s, thallium sulphate, Tl2SO4,
a powerful poison, was illegally used in poison baits to control predators
such as coyotes on western rangelands. Hundreds of eagles died after taking
these baits. A 1.00 kilogram can of Tl2SO4 contains
how many moles of this compound?
||A sample of acid has a mass of 200 g. If this sample
is know to contain 1.5 moles of atoms, what is the molar mass of the acid?
||5.6 moles of a chemical has a mass of 950 grams.
What is the molar mass of the sample.
is used as a fertilizer and to manufacture explosives. How many atoms
of nitrogen are in 0.665 moles of this substance? How many grams of ammonium
nitrate supply this much nitrogen?
|10.||Sodium perborate, NaBO3, is present in
"oxygen bleach". It acts by releasing oxygen, which has bleaching
ability. How many grams of sodium perborate are in 4.65 moles of NaBO3?
|11.||Barium sulphate, BaSO4, is given to patients
as a thick slurry in flavoured water before X-rays are taken of the intestinal
tract. The barium blocks the X-rays, and the tract therefore casts a shadow
that is seen on the x-ray film. How many grams are in 0.568 mole of barium
|12.||Calculate the number of grams in 0.586 mole of each of the following substances?|
|(a) Water, H2O|
|(b) Glucose, C6H12O6, a sugar in grape juice and honey|
|(c) Iron, Fe|
|(d) Methane, CH4
|13.||Calculate the number of moles of each substance in 100.0 grams of each of the following samples:|
|(a) Ammonia, NH3|
|(b) Cholesterol, C27H46O|
|(c) Gold, Au|
|(d) Ethyl alcohol, C2H6O
|14.||Why does 100.0 grams of ammonia, NH3, have so many more moles than 100.0 grams of cholesterol, C27H46O?|