Silicon, which makes up about 25% of earth's crust by mass, is used widely in the modern electronics industry. it has three naturally occurring isotopes,28si,29si, and30si. calculate the atomic mass of silicon to 4 decimal places. isotope isotopic mass (amu) abundance (%) 28si 27.976927 92.23 29si 28.976495 4.67 30si 29.973770 3.10

What reaction is taking place? 02 + c3h8 = h20 + co2

There are 6.022, 104 atoms of hg in 1 mole of hg the number of atoms in 45 moles of hg can be found by multiplying 4.5 by 6.022, 102 which is the number of atoms in 4.5 moles of hg, correctly written in scientific notation with the correct number of significant figures? 0 21,109 0 21,100 271, 1024 27.099, 100 mark this and retum save and exit submit

Miner's coal distributors does not mine coal itself, nor does it even store or handle the coal. instead, miner's solicits orders for low sulfur coal from other firms, then purchases the required amount from suppliers and directs them to ship the coal to its customers. what is miner's