Recent findings in astrophysics suggest that the observable universe can be modeled as a sphere of radius r = 1.37 x 1010 ly. this is equivalent to 1.3 x 1026 m, with an average total mass density of 1 x 10-26 kg/m3. only about 4% of total mass is due to ‘ordinary’ matter (such as protons, neutrons and electrons). (a)estimate how much ordinary matter (in kg) there is in the observable universe. (b) estimate how much ‘dark matter’ there is in the universe.

Since you have not included the experiment situation and the data, of course, i can not give you specific details about it. but i can you with this question.1) i will assume that the motion is projectile (parabolic) motion.2) yes, the horizontal distance depends on the horizontal velocity as, naming vx the horizontal velocity and t the time, it is: x = vx × t3) now, observe that the flight time depends on the vertical velocity as, naming voy the initial vertical velocity, t the time and y the vertical distance before reaching the ground: y = yo + voy×t - gt² / 2.the higher the initial vertical velocity (voy) the longer the object will be flying and so t will be higher in the equation for the horizontal distance.that explains the relationship between the horizontal distance and the horizontal velocity.

Chromium  +  hydrogen sulfate  =  chromium(iii) sulfate  +  hydrogenso then it will be  a. cr + h2so4? cr2(so4)3 + h2