(n) CH Br2CBr + HBr If chlorine bleach is mixed with other cleaning prod- ucts c
ID: 542406 • Letter: #
Question
(n) CH Br2CBr + HBr If chlorine bleach is mixed with other cleaning prod- ucts containing ammonia, the toxic gas NCl3(8) can form according to the equation: 13. 3NaC10(aq) + NH3(aq)--> 3NaOH(aq) + NC13(g) When 2.94 g of NH, reacts with an excess of NaCIO according to the preceding reaction, how many grams of NCly are formed? 14. Each copper(I) sulfate unit is associated with five water molecules in crystalline copper(II) sulfate pentahydrate (CuSO4·5H20). When this compound is heated in air above 100°C, it loses the water mol- ecules and also its blue color: If 9.60 g of CuSO4 are left after heating 15.01 g of the blue compound, calculate the number of moles of H20 originally present in the compound.Explanation / Answer
13)
3 mol NaClO = 1 mol NH3 = 1 mol NCl3
no of mol of NH3 reacted = 2.94/17 = 0.173 mol
no of mol of NCl3 formed = 0.173 mol
mass of NCl3 formed = 0.173*120.3657 = 20.82 g
14) mass of water lost = 15.01-9.6 = 5.41 g
no of mol of water = 5.41/18 = 0.3 mol
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