A. SO3 is an acidic gas
B. Acid is usually added to water and not water to acid
C. The reaction between SO3 and water is violently exothermic
D. SO3 does not dissolve readily in water
Correct Answer: Option C
C. The reaction between SO3 and water is violently exothermic

![A quantity of hot water at 100ºC is added to 400g of water at 10ºC until the temperature of the mixture is 60ºC. Calculate the mass of the hot water added. [Specific heat capacity of water =4200JKg-1 K-1] A quantity of hot water at 100ºC is added to 400g of water at 10ºC until the temperature of the mixture is 60ºC. Calculate the mass of the hot water added. [Specific heat capacity of water =4200JKg-1 K-1]](https://erudites.ng/wp-content/plugins/contextual-related-posts/default.png)