Cecil writes the equation for the reaction of hydrogen and oxygen below.
h2 + o2 → h2o

why does his teacher ask him to balance the equation by including the correct coefficients?

a. to show that most molecules exist in pairs
b. to show that most compounds exist in pairs
c. to show that atoms are conserved in chemical reactions
d, to show that atoms are created in chemical reactions

Acalorimeter is to be calibrated: 51.203 g of water at 55.2 degree c is added to a calorimeter containing 49.783 g of water at 23.5c. after stirring and waiting for the system to equilibrate, the final temperature reached is 37.6 degree c. specific heat capacity of water (s = 4.18 j/g∙degree c). calculate the calorimeter constant. (smδt)warm water = -[(smδt)cold water + (calorimeterδtcold water)]

Quickly what are the following of organisms that existed over a wide area but only for a limited time period called a.soft fossils b.mold fossils c.index fossils d.trace fossils

F1.5 mol of nabh4 react, how many moles of b2h6 are formed? 2 nabh4(aq) + h2so4(aq) → 2 h2(g) + na2so4(aq) + b2h6(g)