1. Not Based on your findings, which method of assessing density do you believe is the least accurate? Why? 2. Not Based on your findings, which method of assessing density do you believe is the most accurate? Why?

Please help. This problem involves finding the radius and volume of a platinum atom using its density. Thank you.

For this problem, we want to estimate the answer, so our assumptions may be a little unrealistic. Suppose we want to estimate how much air we need to send to a space station, assuming we cannot recycle air. Suppose four astronauts are in a spherical space station. If each of them typically breathes about 500 cm³of air with each breathe, and take 15 breathes per minute (average resting value): a. What is the volume of air you would need in the space station if these four astronauts stayed for a full year? b. If the density of air is 1.25 kg/m³ and it costs (thanks to SpaceX) a mere $100/kg to send objects to the space station, how much money would the astronaut air supply cost?

Is it the quantity of 8.21 cm, greater than, less than or equal to 821 mm? Please let me know and explain. Thanks