3. How many moles of oxygen are required to react completely with 5.00 grams of hydrogen? 2H2 + O2 + 2H2O
a. 1.25 mol oxygen
b. 5 mol oxygen
C. 20 mol oxygen
d. None of the above.

100 points answer quick the table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 10 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.

Define dew point. i am writing this part to be able to ask the question

Which statement about hf is true? it is zero for any compound in its standard state. it is positive when the bonds of the product store more energy than those of the reactants. it is negative when a compound forms from elements in their standard states. it is zero for any element that is in the liquid state.