A. If 11.74 liters of nitrogen (N2) at STP was pumped into the basketball, how many grams of nitrogen (N2) gas were pushed into the basketball? Assume the basketball was completely empty prior to filling it with gas. B. A grain of sand has approximately 1.69x10 -4 moles of SiO2. How much does a grain of sand weigh in grams? Assume that sand is 100% SiO2.

Air pressure is measured in pascals. for a professional american football game, the ball should be inflated to about 90,000 pascals. scientists studied the effects of air temperature on the pressure inside american footballs by taking these steps: 1. prepare 100 footballs. 2. measure each football's air pressure. 3. divide footballs into 10 groups. 4. place the groups in different lockers cooled to different air temperatures. 5. after 12 hours, remove the footballs from lockers. 6. measure each football's pressure again. 7. compare the new pressures to the starting pressures. what two terms best describe the variable "air pressure inside the football" in this experiment? independent, qualitative independent, quantitative dependent, qualitative dependent, quantitative