How many different elements are known to exist?

Example of homogeneous mixture.

________ is related to closeness of single measurement to its true value.

80g of H₂ are reacts with 80g of O₂ to form water. Find out the mass of water obtained?

Calculate the number of He atoms in 52 u

Which of the following is an example of extensive property?

What is the SI unit of energy?

_____________compound contains carbon essentially.

__________is a substance which is made up of only one kind of atoms.

Assuming fully decomposed, the volume of CO₂ released at STP on heating 9.85 g of BaCO₃ (atomic mass, Ba = 137) will be