A sample of hydrated copper sulfate weighs 25g. After heating to remove the water of crystallization, the anhydrous copper sulfate weighs 16g. What is the percentage of water of crystallization in the original sample?
16%
25%
36%
56%
Related Questions
Which of the following reactions is the metal displacement reaction? Choose the right option.
Two elements X and Y combine to form two compounds and . If 0.05 moles of weighs 5 g and 0.10 moles of weighs 20 g, find the atomic masses of X and Y.
X = 40, Y = 30
X = 50, Y = 25
X = 60, Y = 20
Cannot be determined from the given data
10 g of a metal oxide on strong heating gave 6.4 g of metal. If the formula of the metal oxide is , what is the atomic mass of the metal M?
56
43
27
65
Two different samples of copper(II) oxide were analyzed and found to contain the same percentage of copper by mass. Which law does this illustrate?
Law of Multiple Proportions
Law of Conservation of Mass
Law of Definite Proportions
Gay-Lussac's Law
When a solid vaporizes directly without melting, it is known as:
Evaporation
Sublimation
Sedimentation
Saponification
Which law explains the observation that 1g of hydrogen always combines with 8g of oxygen to form 9g of water?
Law of Conservation of Mass
Law of Multiple Proportions
Law of Definite Proportions
Gay-Lussac's Law
Which of the following experiments definitively proved the Law of Conservation of Mass?
Dalton's atomic theory
Gay-Lussac's law of combining volumes
Lavoisier's experiments on heating mercury in a sealed container
Proust's law of definite proportions
Which of the following is not a disproportion atom reaction
Two elements, X and Y, combine to form two compounds. Compound A contains 27.3% X and 72.7% Y by mass. Compound B contains 42.9% X and 57.1% Y by mass. If the mass of Y is fixed at 100g in both compounds, which of the following represents the masses of X in the two compounds, consistent with the Law of Multiple Proportions?
37.5g and 75g
27.3g and 42.9g
137.5g and 175g
72.7g and 57.1g
