-12 A virus has a mass of 9.0 x 10 mg and an oil tanker has a mass of 3.0 × 107 kg. Use this information to answer the questions below. Be sure your answers have the correct number of significant digits. What is the mass of 1 mole of viruses? Round your answer to 2 significant digits. How many moles of viruses have a mass equal to the mass of an oil tanker? Round your answer to 2 significant digits. x10

GenAlex Medical, a leading manufacturer of medical laboratory equipment, is designing a new automated system that can detect therapeutic levels of dissolved digoxin (1.5 to 2.0 ng/ml.), using a blood sample that is as small as 25. pl.. Calculate the minimum mass in nanograms of digoxin that the new system must be able to detect. Round your answer to 2 significant digits. 0.2

Multiply or divide the following measurements. Be sure each answer you enter contains the correct number of significant digits. 20.94 cm x 80 cm - 93. g ml. -* 19. mL - 946.2 mol 31.5 L - 0 cm 2 mol 0.9 X

Multiply or divide the following measurements. Be sure each answer you enter contains the correct number of significant digits.

Use mass density to find volume (picture is included)

A chemist weighed out 7.2g of mercury. Calculate the number of moles of mercury she weighed out. Be sure your answer has the correct number of significant digits.

Ammonium phosphate ((NH₂),PO4) is an important ingredient in many fertilizers. It can be made by reacting phosphoric acid (H3PO4) with ammonia (NH3). What mass of ammonium phosphate is produced by the reaction of 1.8 g of ammonia? Be sure your answer has the correct number of significant digits. 7. g 0 10 X