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How much heat is evolved when 267 g of ammonia gas condenses to a liquid at its boiling point?

A 4.90 g nugget of pure gold absorbed 255 J of heat. What was the final temperature of the gold if the initial temperature was 24.0°C? The specific heat of gold is 0.129 J/(g·°C).

If 311 g water at 65.5°C loses 9760 J of heat, what is the final temperature of the water?

the U.S. banned the trans-atlantic slave trade in 1808. what effect did this have on sectionalism in america at this time?

all northern states outlawed slavery by state constitution in 1820. what effect did this have on sectionalism in america?

there are 50 pupils in a class. 43 of them like mathematics, 38 like english and 33 like both mathematics and english. How many pupils like both mathematics and english??