Introduction: Chemists are often interested in obtaining a certain mass of product from a chemical reaction
without wasting any reactants. But how is this done? To calculate the masses of reactants needed for a desired
mass of product, it is necessary to understand a unit of quantity called the mole.
Question: How do chemists know how much of each substance to mix?
1. Observe: The mass of a molecule of a substance is its molecular mass (M). Molecular mass is measured in
universal mass units (u). One universal mass unit (1 u) is approximately the mass of a proton. Hydrogen gas
has a molecular mass of 2.0158 u.
A. Type the formula "H2" into the Reactants box. What is the molar mass of hydrogen gas, H,?
B. What is the relationship between the molecular mass and the molar mass of a substance?
Answers: 3
Biology, 22.06.2019 02:00, aleklupo3353
What is the difference between an igneous, sedimentary and metamorphic rock
Answers: 1
Biology, 22.06.2019 06:30, dtilton2003
Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? question 8 options: the cold balloon expands and rises. the warm balloon shrinks and sinks. the balloons rise at the same rate. both balloons are the same size. the ballons both rise. the cold ballon is larger than the warm balloon. the warm balloon expands and rises. the cold balloon shrinks and sinks.
Answers: 3
Introduction: Chemists are often interested in obtaining a certain mass of product from a chemical r...
Mathematics, 16.07.2020 22:01
Mathematics, 16.07.2020 22:01
Social Studies, 16.07.2020 22:01