Zadania z chemii IB SL

Determine the molecular formula and the empirical formula of cresolphthalein.

Which of the following could be the empirical formula of a compound with $M_\mathrm{r} = 70$? I. $\ce{CH2}$ II. $\ce{C4H6O}$ III. $\ce{C5H10}$ A. I and II only B. I and III only C. II and III only D. I, II and III

Calculate the percentage by mass of hydrogen in compound Y, giving your answer to four significant figures. Use section 7 of the data booklet.

When 3.71 g of Z was burned completely in excess oxygen, 8.81 g of carbon dioxide and 4.51 g of water were collected. Determine the empirical formula of Z. Use sections 1 and 7 of the data booklet.

What is the empirical formula of a compound with the following composition by mass? Element C H O Percentage by mass 54.5 % 9.1 % 36.4 % A. $\ce{C6HO4}$ B. $\ce{C4H8O}$ C. $\ce{C2H4O}$ D. $\ce{C4H8O2}$

4.81 g of sulfur was heated in a stream of chlorine gas until the reaction was complete. The mass of the chloride produced was 10.13 g. (i) Calculate how many atoms are present in this 4.81 g sample of sulfur. Use sections 2 and 7 of the data booklet. (ii)…

Determine the empirical formula of HA.

State the molecular formula of HA.