A chemist collected about 3535 grams of oxygen molecules in a gas syringe. ​Assume that there are 7.25\cdot 10^{23}7.25⋅10
23
molecules of oxygen in the syringe.

​

​a.) Find the mass of one oxygen molecule in kilograms.

​Write your answer in scientific notation. Round the coefficient to the nearest tenth.

​

​ Mass =
kilograms

​

​b.) Calculate the mass of one oxygen atom if an oxygen molecule consists of 2 atoms.

​Write your answer in scientific notation. Round the coefficients to the nearest tenth.

​

​ Mass =

kilograms

​

What are the solution(s) to the quadratic equation x2 – 25 = 0? o x = 5 and x = -5ox=25 and x = -25o x = 125 and x = -125o no real solution

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Arrange the steps to solve this system of linear equations in the correct sequence. x + y = -2 2x – 3y = -9 tiles subtract 3x + 3y = -6 (obtained in step 1) from 2x – 3y = -9 (given) to solve for x. substitute the value of x in the first equation (x + y = -2) to get y = 1. the solution for the system of equations is (-3, 1). x = -15 the solution for the system of equations is (-15, 13). add 3x + 3y = -6 (obtained in step 1) to 2x – 3y = -9 (given), and solve for x. x = -3 substitute the value of x in the first equation (x + y = -2) to get y = 13. multiply the first equation by 3: 3(x + y) = 3(-2) 3x + 3y = -6.