describe how a solid sample of calcium sulphate can be prepared using dil nitric v acid dil sulphuric vi acid and solid calcium carbonate​

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

In pqr m< p=60 m< q= 30 and m

Pls ill give u brainliest which of the following is true about science? 1. political conditions are unable to influence it. 2. economic concerns may prevent it from solving problems.