What is the mass number of an ion with 107 electrons, 157 neutrons, and a 1 charge?

The density of an unknown gas at 98°c and 740 mmhg is 2.50 g/l. what is the molar mass of the gas with work showed?

Use the drop-down menus to answer each question. which runner finished the 100 m race in the least amount of time? which runner stopped running for a few seconds during the race? at what distance did anastasia overtake chloe in the race?

Arecipe calls for 1.2 cups of oil. how many liters of oil is this?