8) Calculate the work done for the isothermal expansion of 1 mole of an ideal gas at 27 °C from an initial volume of 20 liters to a final volume of 40 liters.
(R = 8.314 JKmol-').
(7 marks)​

Asample of radium-226 will decay 1/4 of its original amount after 3200years. what is the half-life of radium-226?

How many atoms of mg are present in 97.22 grams of mg? 6.022 × 1023 2.408 × 1024 4.818 × 1024 5.855 × 1025

22. a flask containing 450 ml of 0.50 m h2so4 was accidentally knocked to the floor. how many grams of nahco, do you need to put on the spill to neutralize the acid according to the following equation: h2so4(aq)+2 nahcos(aq) na,so(aq) +2 h20()+2 co2(g) d) 38 g a) 2.3 g b) 9.5 g c) 19 g