## quote one person as saying of the bombing in Riyadh in May, ‘At that time it was seen as justifiable because there was an invasion of a foreign country, there was frustration.’

“I, like many of my fellow Muslims, was appalled by the latest bombings in Saudi Arabia (‘Among the Saudis, Attack Has Soured Qaeda Supporters,’ front page, Nov. 11). Yet I was disturbed to get the sense that Saudis were angered by this latest act of barbarity because the targets were mainly Arab and Muslim. “You quote one person as saying of the bombing in Riyadh in May, ‘At that time it was seen as justifiable because there was an invasion of a foreign country, there was frustration.’ Another says, ‘Jihad is not against your own people.’ “Regardless of whether the victims are Muslim or not, the vicious murder of innocent human beings is reprehensible and repugnant, an affront to everything Islam stands for. Any sympathy for Al Qaeda among the minority of Saudis should have evaporated after the May

bombings in Riyadh, and it should have surprised no one in Saudi Arabia that Al Qaeda would attack a housing complex full of Arabs and Muslims.

### Determine the outlet concentration x1 in the water solution and in the trichloroethane solution using an analytical equation.

Predicting Extraction for an Existing Tower with a Given Number of Steps. An existing tower contains 5.0 theoretical steps. It is desired to predict its performance under the following conditions….

### Calculate the minimum solvent that can be used. [Hint: In this case, the tie line through the feed L0 represents the condition for minimum solvent flow rate.

Minimum Solvent and Countercurrent Extraction of Acetone. An aqueous feed solution of 1000 kg/h containing 23.5 wt % acetone and 76.5 wt % water is being extracted in a countercurrent….

### Determine the break-point time, the fraction of total capacity used up to the break point, the length of the unused bed, and the saturation loading capacity of the solid.

Drying of Nitrogen and Scale-Up of a Column. Using molecular sieves, water vapor was removed from nitrogen gas in a packed bed (C1) at 28.3°C. The column height was 0.268….