Asample of a gas occupies 1.40 x 10^3 ml at 25°c and 760 mmhg. what volume will it occupy at the same temperature and 380 mmhg

 The volume  that   the gas will occupy  at the same temperature is  

2800 Ml

  calculation

This  volume is calculated  using Boyle's   law formula  since the  temperature  is constant

that is  P₁V₁=P₂V₂  where,

P₁ = 760 mm hg

V₁= 1.40  x 10³  ml

P₂= 380  mmhg

V₂ = ? ml

make V₂  the subject  of the formula  by  diving both side of equation by P₂

V₂ =P₁V₁ /P₂

V₂ = [760 mmhg ( 1.40 x 10³) / 380  mmhg] = 2800 ml

a saline water is fed to a reverse osmosis unit at flow rate o rotameter connected to reject (retentate) line reads 8 installed in reject and permeate line reads 15.2 milli siemens/cm and 300 micro siemens/com respectively.

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.