pllzz ans. 5th no link

pllzz ans. 5th no link moles Of acid required to (h) mass of acid consumed mol (d) 0.02 mol (e) (f) L at mol (h) 2.92'! 4. *'lid dichromate (molar mass 252 g) decomp-tses as under: (NH.)2Cr20Ås) CrO(s) + (a) If g Of ammonium dichromate decomposes, What will be the "apparent" loss Of mass? (Ans: (a) 25 (b) (b) Calculate the mass of chromium(lll) oxide formed at the same time. (Cr 52) Washing soda has the formula Na2COv10H20, What mass of anhydrous sodium carbonate is left when all the water oi 21.2 tl crystallisation is expelled by heating 57.2 g Of washing soda? 6. In the reaction:Na2S04 Pb(NOÖ2 When excess of lead nitrate solution was added to a solution of sodium sulphate, 15.15 g of lead sulphate wert precipitated. What mass of sodium sulphate was present in the original solution? (H 1, C 12, O 16, N = 14, IAns: Fe30ds) + 4H2@) 7. In the reaction: 3Fe(S) Calculate the weight of Fe„04 formed and the volume of H2 evolved at STP when 28 g oi iron completely reacts with steam. 56) (Ans: 38.67 g. 14.9311 8. Calculate the weight oi aluminium carbide consumed and weight of aluminium hydroxide precipitated if 8 g of methane is formed in the following reaction: (A1 - 27) (Ans: 24 g and 52

Washing soda on heating converted to anhydrous Sodium carbonate.

N a_{2} C O_{3} . 10 H_{2} O \overset{H e a t}{\to} N a_{2} C O_{3} + 10 H_{2} O C a l c u l a t e t h e m o l e c u l a r m a s s o f w a s h i n g s o d a a n d s o d i u m c a r b o n a t e . M o l m a s s o f N a_{2} C O_{3} = (2 \times 23 + 1 \times 12 + 3 \times 16) = 106 g W a s h i n g s o d a m o l . m a s s = (2 \times 23 + 1 \times 12 + 3 \times 16 + 10 \times 18) = 286 g T h u s 286 g o f w a s h i n g s o d a g i v e s 106 g o f S o d i u m c a r b o n a t e . 57.2 g o f w a s h i n g s o d a g i v e s = ? = \frac{106}{286} \times 57.2 = 21.2 g

Amount of Sodium carbonate left = 21.2 g