Achemist prepares a solution of nickel(ii) chloride (nicly) by measuring out 61.3 umol of nickel(ii) chloride into a 200 ml volumetric flask and filling the flask to the mark with water. calculate the concentration in umol/l of the chemist's nickel(ii) chloride solution. round your answer to 3 significant digits. x 5 ? explanation check 2009 mew econ aires reserved. terms of use

The combustion of methane, ch4, releases 890.4kj/mol. that is, when one mole of methane is burned,890.4 kj are given off to the surroundings. this meansthat the products have 890.4 kj less than the reactants.thus, ah for the reaction = - 890.4 kj. a negative symbolforah indicates an exothermic reaction.ch (g) + 20 (g)> co2 (g) + 2 h0 (1); ah = - 890.4 kga) how much energy is given off when 2.00 mol of ch,are burned? b) how much energy is released when 22.4g of ch. areburned?