A sample of hydrated copper sulfate () weighs 25 g. Upon heating to drive off all the water, the anhydrous copper sulfate () remaining weighs 16 g. What is the value of 'x' (the number of water molecules of crystallization)?
2
3
5
7
Related Questions
Hydrogen and oxygen combine to form water (H2O). If 4g of hydrogen reacts completely with oxygen to form water, what mass of oxygen is required?
8g
16g
32g
64g
Which of the following reactions is the metal displacement reaction? Choose the right option.
Which of the following reactions is the metal displacement reaction? Choose the right option.
10g of hydrogen reacts with 80g of oxygen to form water. Which law of chemical combination does this demonstrate?
Law of Conservation of Mass
Law of Multiple Proportions
Law of Definite Proportions
Avogadro's Law
Iron filings are added to a solution of copper sulfate. Which observation indicates a metal displacement reaction has occurred?
Gas bubbles are produced.
The temperature of the solution decreases.
The blue solution fades and a reddish-brown solid deposits.
The solution becomes more intensely blue.
Which metal, among Mg, Cu, Ag, and Au, would effectively displace copper from a copper sulfate solution?
Mg
Cu
Ag
Au
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
If two elements A and B combine in different ratios to form two compounds, and , then according to the Law of Multiple Proportions:
The ratio of masses of B which combine with a fixed mass of A is a simple whole number ratio.
The ratio of masses of A which combine with a fixed mass of B is a simple whole number ratio.
The ratio of masses of A which combine with a fixed mass of A is a simple whole number ratio.
The ratio of masses of B which combine with a fixed mass of B is a simple whole number ratio.
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
Which law states that a chemical compound always contains the same elements combined together in the same fixed proportion by mass?
Law of Multiple Proportions
Law of Conservation of Mass
Law of Definite Proportions
Avogadro's Law
