Soda and lime are added to a glass batch in the form of soda ash (na2co3) and limestone (caco3). during heating, these two ingredients decompose to give off carbon dioxide (co2), the resulting products being soda and lime. compute the weight of soda ash and limestone that must be added to 100 lbm of quartz (sio2) to yield a glass of composition 75 wt% sio2, 15 wt% na2o, and 10 wt% cao.

Athin walled concentric tube exchanger is used to cool engine oil from 160°c to 60°c with water that is available at 25°c acting as a coolant. the oil and water flow rates are each at 2 kg/s, and the diameter of the inner tube is 0.5 m and the corresponding value of the overall heat transfer coefficient is 250 w/m2. oc. how long must the heat exchanger be to accomplish the desired cooling? cpwater=4.187 kj/kg-candcpengine el=2.035 kj/kg·°c, oil . 120]