Airbags operate through the explosive reaction of sodium azide to form nitrogen gas: 20 NaN3(s) + 6 SiO2(s) +4 KNO3(s) — 32 N2(g) + 5 Na4 SiO4(s) + K4 SiO4(s) How many grams of NaN3 are required to fill an airbag with a volume of 3.00 x 104 cm3 at 75 °F and 1.00 atm of pressure?​

An alloy contains 66 g of pure zinc. what is the percentage of zinc in the alloy? express your answer to two significant figures and include the appropriate units.

Using the first volume and temperature reading on the table as v1 and t1, solve for the unknown values in the table below. remember to use the rules of significant figures when entering your numeric response.

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)