200 cm³ of air was passed over heated copper in a syringe several times to produce copper (II) oxide.
When cooled, the final volume of air recorded was 158cm³. Estimate the percentage of oxygen in the air?

Similar Questions

If the elements X and Y have atomic numbers 11 and 17 respectively, what type of bond can they form?...

The function of zinc electrode in a galvanic cells is that it ...

Given the reactions (i) Fe(s) + X(NO3)2(aq) → Fe(NO3) + X(s) (ii) H2(g) + XO → X + H2O(s); X is ...

Which of the following conduct electricity? ...

Stainless steel is an alloy of ...

A phenomenon where an element exist in different forms in the same physical state is known as ...

The characteristics reaction of carbonyl compounds is? ...

The basic assumption in the kinetic theory of gases that the collisions of the gaseous molecules are...

Which of the following statements is not correct?...

What is the atomic number of Lithium? ...