There are only two isotopes of gallium: ^69ga (68.926 amu) and ^71ga(70.025 amu). the average atomic mass of gallium is 69.723 amu. what is the percent of abundance of gallium-69? show all calculations involved.

How many atoms are there in 5.70 mol of mg

The diagram below shows the different phase transitions that occur in matter. which arrow represents the transition in which dew is formed?

The famous scientist galileo galilei did several experiments with sloping planes, which he rolled metal balls down so that he could study motion. by changing the slope, he could study how the speed at which the ball rolled was affected. what was the independent variable in galileo's experiment? a. the speed of the ball b. the slope of the plane c. whether the ball moved d. what the ball was made of