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.

Will mark brainliest 26. which of these statements are true? (3 points) a. gases are compressible b. gases fill their containers completely c. the pressure of a gas is independent of the temperature d. gases have mass e. gases exert pressure f. the pressure of a gas is dependent on the volume g. gas pressure results from the collisions between gas particles h. gases have a definite volume and shape

Americium-241 undergoes fission to produce three neutrons per fission event. if a neutron-absorbing material is mixed in with this sample so that the rate of neutron production drops down to 1.8 neutrons per fission event, which will be effective at achieving a critical mass? check all that apply. remove a deflective shield surrounding the sample. remove absorbent material mixed in with the sample. compress the sample of americium-241.

The number to the right of an element's symbol (ex. c-12) identifies the of an isotope.