How many grams of calcium are required to free 8 grams of hydrogen gas from hydrochloric acid, HCl? Ca + 2HCl --> CaCl2 + H2

grams Ca

What is the relationship of air masses and the temperature of oceans?

What are transitions between a liquid and gas called? identify which way they are transitioning

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