What mass of hydrogen is consumed when 587.9 kj of energy is evolved from the combustion of a mixture of h 2(g) and o 2( g)? h 2(g)+0 28)o h 20(; d -285.8 k a. 2.073 g b.0.2412 g oc.4.147 g od.6.162 g oe. 2.131 g

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

Which statement can best be concluded from the ideal gas law?

Apiece of copper has a temperature of 75.6 0c. when the metal is placed in 100.0 grams of water at 19.1 0c, the temperature rises by 5.5 0c. what is the mass of the metal?