How many particles are present in 7.8 moles of a substance

All of the following are part of the biosphere except

He table below gives the atomic mass and relative abundance values for the three isotopes of element m. relative abundance (%) atomic mass (amu) 78.99 23.9850 10.00 24.9858 11.01 25.9826 what is the average atomic mass (in amu) of element m? 2.86 5.36 24.30 24.98

No copying 15 pts how does a free-body diagram tell you about the net force on an object?