How many liters of O2 at STP will react with 8.7 grams of C2H4 to form CO2 and H2O? I need to round to the nearest hundreth

Name the element in group 17, period 2. (periodic table)

A650 ml sodium bromine solution has a bromide ion concentration of 0.245 m. what is the mass (g) of sodium bromide in solution? a) 103.b)0.00155.c)16400.d) 16.4.e) 0.159

Pls ill give u brainliest which of the following is true about science? 1. political conditions are unable to influence it. 2. economic concerns may prevent it from solving problems.