0.5 gm of zinc dissolved in dilute sulphuric acid gives 183 cc of moist hydrogen at 9 °C and 748 mm. What would the volume of the gas be at NTP ? Calculate the weight of zinc required to liberate 22.4 litres of dry hydrogen at NTP ? (Aqueous tension at 9°C = 8.6 mm)

Several kinds of bears are found on earth. most bears are brown or black, but one type of bear, the polar bear, is white. what process led to this difference in fur color? explain your answer.

Observation and experimentation have led many scientists to accept a theory about the origin of the universe. this theory is called the big bang theory. scientific evidence collected and observed by scientists around the world suggests that the universe is ever expanding from a hot and dense initial state. what makes this a scientific theory? (2 points)

Suppose that a certain fortunate person has a net worth of $71.0 billion ($7.10×1010). if her stock has a good year and gains $3.20 billion (3.20×109) in value, what is her new net worth?