(a) Calculate the percentage of boron (B) in borax (Na2B4O7·10H2O). (H = 1, B = 11, O = 16, Na = 23).(b) (i) The compound A has the following percentage composition by mass:Carbon = 26.7%, oxygen = 71.1%, hydrogen = 2.2%. Determine the empirical formula of A (H = 1, C = 12, O = 16)(ii) If the relative molecular mass of A is 90, what is the molecular formula of A?

(a) Calculate the percentage of boron (B) in borax (Na2B4O7·10H2O). (

1.	(a) Calculate the percentage of boron (B) in borax (Na2B4O7·10H2O). (H = 1, B = 11, O = 16, Na = 23).(b) (i) The compound A has the following percentage composition by mass:Carbon = 26.7%, oxygen = 71.1%, hydrogen = 2.2%. Determine the empirical formula of A (H = 1, C = 12, O = 16)(ii) If the relative molecular mass of A is 90, what is the molecular formula of A?
Answer» (a) Calculate the percentage of boron (B) in borax (Na₂B₄O₇·10H₂O). (H = 1, B = 11, O = 16, Na = 23). (b) (i) The compound A has the following percentage composition by mass: Carbon = 26.7%, oxygen = 71.1%, hydrogen = 2.2%. Determine the empirical formula of A (H = 1, C = 12, O = 16) (ii) If the relative molecular mass of A is 90, what is the molecular formula of A?