Proust's Law of Definite Proportions — Overview & Origin
Read this topicExplanations 5
- The Law of Definite Proportions, proposed by Joseph Proust, states that a compound is always composed of the same elements by mass. In other words, in a compound, the ratios of …
By Lydia Kim, Gabi Slizewska
- Water is made of the elements hydrogen and oxygen- but is any mix of hydrogen and oxygen water? Even without a background in chemistry, it feels pretty instinctive that it isn't…
By Adrien, Gabi Slizewska
- The Law of Definite Proportions states that the mass ratios of elements are always the same for the same compound. Let's take carbon dioxide as an example. In carbon dioxide, 27…
By Jasper Brown, Gabi Slizewska
- (Video) Chemistry 5.8a Law of Definite Proportions by IsaacsTEACH In this video, you will learn why compounds are always formed from a fixed ratio of elements. The ratio will al…
By Mario Janakis
- Proust's Law of Definite Proportions Proust's Law of Definite Proportions was created by Joseph Proust (a French chemist) in 1794 after realizing during his experiments that cop…
By Caroline Monahan, Gabi Slizewska
Problems 18
- Will any combination of H and O make water?
- We have a mystery compound composed of 2 elements; element A and element B. 72% of the mass is known to come from element A. How many grams of element B are present if we have 2…
- 10 grams of some compound is found to be 3 grams of element A and 7 grams of element B. What percent of this compounds mass results from element A?
- Propane has the chemical formula C3H8C_{3}H_{8}C3H8, and carbon is 12 times as massive as hydrogen. How much hydrogen is needed to turn 5 grams of carbon into propane?
- Methane is composed of only carbon and hydrogen. If a quarter of methane's mass comes from hydrogen, how much carbon is in 100 grams of methane?
- If element X has a weight of 20 AMU, and element Y has a weight of 50 AMU, what must be the weight percent of X within the compound XY?
- Some molecule has the formula X2Y3X_{2}Y_{3}X2Y3. If 43.8% of the mass is the result of species X, and there are 15 grams of X2Y3X_{2}Y_{3}X2Y3, how many grams of Y are there?
- Calcium has an atomic mass of 40.1 AMU, oxygen has an atomic mass of 16 AMU, and hydrogen has an atomic mass of 1 AMU. What weight percent of Ca(OH)2Ca(OH)_{2}Ca(OH)2 is calcium?
- If oxygen has a mass of 16 AMU, and nitrogen has a mass of 14 AMU, how much nitrogen is required to turn 8 grams of oxygen into NO2NO_{2}NO2?
- The mass of oxygen is 16 AMU. The mass of hydrogen is 1 AMU. This means that in a molecule of water, 88.9% of the mass is oxygen. If the mass was expessed in kilograms instead o…
- An unknown compound is found to be 80% oxygen by mass, is it possible for this compound to be H2OH_{2}OH2O?
- The law of definite proportion compares something‾\underline{\phantom{something}}something.
- Carbon and oxygen are known to form a compound in a 1 atom to 1 atom ratio, but oxygen is 33.3% heavier than carbon. What is the weight percent of oxygen in this compound?
- If elements A and B are known to form a compound in a 1 atom to 1 atom ratio, How many grams of B is needed to fully react with 5 grams of A?
- If water contains 16.00 g O per 2.02 g H, and you mix 20 g of O with 5 g of H, how much unreacted H will you have left?
- What is the weight percent of hydrogen in NH3NH_{3}NH3 if nitrogen is 14 times heavier than hydrogen?
- 22.99 g of Na reacts with 35.45 g Cl to make table salt, NaCl. If you mix 100 g of Na with 150 g of Cl, you'd have woah‾\underline{\phantom{woah}}woah g of woah‾\underline{\pha…
- The molar mass of C is 12.01 g, and the molar mass of H is 1.01 g. What mass ratio does C:H react in to form CH4CH_{4}CH4?