22) the calculation of quantities in a chemical reaction is called stoichiometry. \ntrue\nfalse\n23) the…

22) the calculation of quantities in a chemical reaction is called stoichiometry. \ntrue\nfalse\n23) the molar mass is the mass of one mole of a pure substance.\ntrue\nfalse\n24) the international system of units to measure the amount of a substance is called a mole.\ntrue\nfalse\n25) in the following equation, what is the ratio of hydrogen molecules to water molecules?\n2 h₂ + o₂ -> 2 h₂o\na) 1:1\nb) 2:2\nc) 2:1

22) the calculation of quantities in a chemical reaction is called stoichiometry. \ntrue\nfalse\n23) the molar mass is the mass of one mole of a pure substance.\ntrue\nfalse\n24) the international system of units to measure the amount of a substance is called a mole.\ntrue\nfalse\n25) in the following equation, what is the ratio of hydrogen molecules to water molecules?\n2 h₂ + o₂ -> 2 h₂o\na) 1:1\nb) 2:2\nc) 2:1

Answer

Explanation:

Step1: Recall stoichiometry definition

Stoichiometry is indeed the calculation of quantities in a chemical reaction. So, question 22 is True.

Step2: Recall molar - mass definition

The molar mass is defined as the mass of one mole of a pure substance. So, question 23 is True.

Step3: Recall mole definition

The mole is the SI - unit for the amount of a substance. So, question 24 is True.

Step4: Analyze the chemical equation

In the equation $2H_2 + O_2\rightarrow2H_2O$, there are 2 hydrogen molecules ($H_2$) and 2 water molecules ($H_2O$). The ratio of hydrogen molecules to water molecules is 2:2, which simplifies to 1:1.

Answer:

  1. True
  2. True
  3. True
  4. A. 1:1