Q29: Calculate AH in (kJ) for following reaction: 4K20.) + 3028 - 3K2020) + 2KO200)
Given the following equations:
KO) + 40210 - K.02.) AH = -132.6 kJ X
4K026) 2K30 + 302 AH=411.6 kJ -
2K020) - K2020. + O2 AH = 73.2 kJ
D
9500

Determine the number o moles of ions/atoms/particle in the following: 2.50 miles of k2s (let me know how to do)

How many moles are in 250 grams of tungsten (w)? * 4.4x10^23 moles 4.2x10^23 moles 0.7 moles 1.4 moles

1. suppose a reaction mixture, when diluted with water, afforded 300 ml of an aqueous solution of 30 g of the reaction product malononitrile [ch2(cn)2], which is to be isolated by extraction with ether. the solubility of malononitrile in ether at room temperature is 20.0 g/100 ml, and in water is 13.3 g/100 ml. what weight of malononitrile would be recovered by extraction with (a) three 100-ml portions of ether and (b) one 300-ml portion of ether? suggestion: for each extraction, let x equal the weight extracted into the ether layer. in part (a), the concentration in the ether layer is x/100 and in the water layer is (30 x)/300; the ratio of these quantities is equal to k 20/13.3.