Question

Class 11 chemistry
Q1. How many atoms will be there in
a) 3 moles of Fe
b) 3 moles of O2
c) 3 moles of SO2
Q2. Define law of multiple proportions and explain with an example.
Q3. An organic compound has the following percent composition C=48%,H=8%, N=28%.Calculate the empirical formula of the compound.
Q4. Calculate molality,molarity and mole fraction of KI (potassium iodide), if density of 20% aqueous KI solution is 1.202 gm/L.
Q5. One liter of sea water weighs 1050 grams and contain 6x10^-3 gram of dissolved oxygen gas. Calculate the concentration of the dissolved oxygen in parts per million.

Answer 1

$\rm\huge\underline{Answer}$

Chemistry is a branch of natural science that deals principally with the properties of substances, the changes they undergo, and the natural laws that describe these changes.