A helium airship has a gasbag of volume 10000 m3 at sea level (1.00 bar) and at 20°C. At higher altitudes, the air pressure falls at a rate of 0.10 bar for every 1000 m increase in altitude.
a) What will the volume of the gasbag be at a height of 1500 m, when the pilot's thermometer registers a temperature of 5°C?
b) The airship rises through the atmosphere until the volume of its gasbag is 10500 m3. The temperature is 0°C.
i- What is the pressure indicated by the pilot's
barometer?
ii- Calculate the height of the airship.

Asample of aluminum foil contains 8.60 × 1023 atoms. what is the mass of the foil?

Which of the following describes a compound? (hint: carbon and oxygen bo a. a piece of pure carbon, containing only carbon atoms b. oxygen gas surrounding a solid piece of carbon c. a substance made of two oxygen atoms for each carbon atom carbon and oxygen atoms mixed without being bonded together

Cryolite, na3alf6(s), an ore used in the production of aluminum, can be synthesized using aluminum oxide. start this question by first balance the chemical equation.1.) balance the equation: - alo3(s)+naoh(l)+hf(> na3alf6+h2o(g). 2.) if 17.5 kilograms of al2o3(s), 51.4 kilograms of naoh(l), and 51.4 kilograms of hf(g) react completely, how many kilograms of cryolite will be produced? 3.)which reactants will be in excess, (al2o3, naoh, or hf) 4.)what is the total mass of the excess reactants left over after the reaction is complete in kg?