(a)
Interpretation:
A balanced chemical equation is given. It has to be interpreted in terms of particles, moles and mass and obeying of law of conservation of mass in it has to be shown.
Concept introduction:
According to law of conservation of mass, it is not possible to form the mass or to destroy the mass. The mass always remains conserved.
The number of moles is calculated as shown below:
(a)
Answer to Problem 1PP
The given equation shows that one molecule of nitrogen gas reacts with three molecules of hydrogen gas to form two molecules of ammonia gas. In terms of number of moles it is seen that one mole of nitrogen gas reacts with three moles of hydrogen gas to form two moles of ammonia gas. Here,
Explanation of Solution
The given chemical equation is shown below:
The above equation shows that one molecule of nitrogen gas reacts with three molecules of hydrogen gas to form two molecules of ammonia gas. In terms of number of moles, it is seen that one mole of nitrogen gas reacts with three moles of hydrogen gas to form two moles of ammonia gas.
The molar mass of nitrogen is
The molar mass of hydrogen is
The molar mass of ammonia is
Thus,
Total mass of reactants and products is given as shown below:
Here, the mass of reactants is equal to mass of the products. Thus, law of conservation of mass is obeyed.
(b)
Interpretation:
A balanced chemical equation is given. It has to be interpreted in terms of particles, moles and mass and obeying of law of conservation of mass in it has to be shown.
Concept introduction:
According to law of conservation of mass, it is not possible to form the mass or to destroy the mass. The mass always remains conserved.
The number of moles is calculated as shown below:
(b)
Answer to Problem 1PP
In the given equation shows that one molecule of aqueous hydrogen chloride reacts with one molecule of potassium hydroxide to form one molecule of potassium chloride and one molecule of water. In terms of number of moles, it is seen that one mole of aqueous hydrogen chloride reacts with one mole of potassium hydroxide to form one mole of potassium chloride and one mole of water. Here,
Explanation of Solution
The given chemical equation is shown below:
The above equation shows that one molecule of aqueous hydrogen chloride reacts with one molecule of potassium hydroxide to form one molecule of potassium chloride and one molecule of water. In terms of number of moles, it is seen that one mole of aqueous hydrogen chloride reacts with one mole of potassium hydroxide to form one mole of potassium chloride and one mole of water.
The molar mass of hydrogen chloride is
The molar mass of potassium hydroxide is
The molar mass of potassium chloride is
The molar mass of water is
Thus,
Total mass of reactants and products is given as shown below:
Here, the mass of reactants is equal to mass of the products. Thus, law of conservation of mass is obeyed.
(c)
Interpretation:
A balanced chemical equation is given. It has to be interpreted in terms of particles, moles and mass and obeying of law of conservation of mass in it has to be shown.
Concept introduction:
According to law of conservation of mass it is not possible to form the mass or to destroy the mass. The mass always remains conserved.
The number of moles is calculated as shown below:
(c)
Answer to Problem 1PP
The given equation shows that two molecules of magnesium react with one molecule of oxygen to form two molecule of magnesium oxide. In terms of number of moles, it is seen that two moles of magnesium reacts with one mole of oxygen to form one mole of magnesium oxide. Here,
Explanation of Solution
The given chemical equation is shown below:
The above equation shows that two molecules of magnesium react with one molecule of oxygen to form two molecule of magnesium oxide. In terms of number of moles it is seen that two moles of magnesium reacts with one mole of oxygen to form one mole of magnesium oxide.
The molar mass of magnesium is
The molar mass of oxygen gas is
The molar mass of magnesium oxide is
Thus,
Total mass of reactants and products is given as shown below:
Here, the mass of reactants is equal to mass of the products. Thus, law of conservation of mass is obeyed.
Chapter 11 Solutions
Glencoe Chemistry: Matter and Change, Student Edition
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