The production of iron and carbon dioxide from iron(iii) oxide and carbon monoxide is an exothermic reaction. which expression can you use to find how many kilojoules of heat are produced when 3.40 mol fe2o3reacts with an excess of co? fe2o3( s) + 3co( g) → 2fe( s) + 3co2( g) + 26.3 kj

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

Astudent is trying to create a table that compares hypotheses, theories, and laws. hypothesis theory law do scientific researchers formulate it? yes yes yes does it explain why things happen? yes yes no yes yes yes is it used to make predictions? no yes yes which of the following questions would most likely fill the blank in the table? is it an intelligent guess? is it newly formulated? is it based on observations? has it been proved?

What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?