1. Terephthalic acid, an important raw material for making Dacron, a synthetic fibre, is made from para-xylene by the following reaction. он + 30, + 2 H,0 CH3 OH para-sylene terephthalic acid Cll What mass of terephthalic acid could be made from 154 grams of para-xylene?

Q4. Some airbags in cars contain sodium azide (NaN3). (a) Sodium azide is made by reacting dinitrogen monoxide gas with sodium amide (NANH2) as shown by the equation. 2NANH2 + N20 → NaN3 + NAOH NH3 Calculate the mass of sodium amide needed to obtain 550 g of sodium azide, assuming there is a 95.0% yield of sodium azide. Page 5 of 12 Give your answer to 3 significant figures. (b) If a car is involved in a serious collision, the sodium azide decomposes to form sodium and nitrogen as shown in the equation. 2NAN3(s) 2Na(s) + 3N2(g) The nitrogen produced then inflates the airbag to a volume of 7.50 x 10-2 m3 at a pressure of 150 kPa and temperature of 35 °C. Calculate the minimum mass of sodium azide that must decompose. (The gas constant R = 8.31 J K-1 mol-1) (Hint: find out the number of moles of Nzusing Ideal gas equation, and determine the number of moles and mass of NaN3 from the balanced equation)

Combining 0.266 mol Fe,O, with excess carbon produced 20.0 g Fe. Fe, O, + 3 C → 2 Fe + 3 CO What is the actual yield of iron in moles? actual yield: mol What is the theoretical yield of iron in moles? theoretical yield: mol

What mass of H2O is produced from 100 g of H2 in the foillowing reaction.  2H2  +  O2  →  2H2O

1. Urea can be prepared by reacting ammonia with carbon dioxide.                               2 NH3 (g) + CO2 (g) ® (NH2)2C=O (aq) + H2O (l)    Calculate the mass of urea (in grams) which is formed from the reaction of 375 g of ammonia with 650 g of CO2.

2 Al (s)  +  3 Br2  ----------->  2AlBr3 (s)     How many grams of aluminum bromide are produced by the complete reaction of 0.557 grams of aluminum?

How many grams of CaCO3 will be produced if we produce 62.06 grams of NaCl in the reactionCaCl2   +    Na2CO3    ———>   2 NaCl   +   CaCO3

5. An organic compound containing only C, H, and possibly O was subjected to combustion analysis. A sample weighing 0.7585 g yielded 1.295 g CO₂ and 0.464 g H₂O. What is the empirical formula of the compound?

ABS plastic is a polymer consisting of three monomer units: acrylonitrile (C₃H₃N), butadiene (C₄H₆), and styrene (C₈H₈). A sample of ABS plastic contains 13.7% N by mass. It took 1.56 g of Br₂ to react completely with a 2.00 g sample of ABS plastic. Bromine reacts 1:1 (by moles) with the butadiene units in the polymer and nothing else, so bromination is a method for determining the quantity of butadiene in the polymer. What is the percent by mass of styrene in the polymer?

Balance and complete the following combustion reaction. Give the sum (one number only) t e t r a c a r b o n h e x a h y d r i d e ( g ) + o x y g e n ( g ) ⟶ ?