Use the equation below to answer the following questions: 2 C4H10 + 13 O2 → 8 CO2 + 10 H2O

A) How many moles of O2, are needed to react with 25.9g of C4H10?

B) If 22.2 g of CO2 is produced, what mass of water is also produced?

C) How many moles of oxygen gas are needed to produce 0.30 moles of carbon dioxide?

A (2.475 mol O2). B (11.35 g)  C. (.4875 mol O2)

Explanation:

A.

convert 25.9 g C4H10 (68g/mol) to mol. --> .3808 mol

then use mole ratios from equation

.3808 mol C4H10 x (13 mol O2 / 2 mol C4H10). ---> 2.475 mol O2

B.

convert 22.2 g CO2 (44g/mol) to mol. ---> .5045 mol

.5045 mol CO2 x (10 mol H2O / 8 mol CO2) > .6306 mol H2O

convert .6306 mol to g > 11.35 g

C.

.3 mol CO2 x (13 mol O2 / 8 mol CO2) ---> .4875 mol O2

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.