ifa system is performing 45 Jof work to the surrounding and is gaining 30 J of heat from the surrounding, which o shows the correct signs for heat, work and change in internal energy (AU) representing the system? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. q = +, w = +, AU = + q = -,W = ,AU = – q= +,w - -, AU = + q=-,w= +, AU = + q =+,w= =,AU = – q= -, w =+,AU = –

||| Solving a basic calorimetry problem A sample of polystyrene, which has a specific heat capacity of 1.880 J.g¹.C¹, is put into a calorimeter (see sketch at right) that insulated contains 200.0 g of water. The polystyrene sample starts off at 92.7 °C and the temperature of the water starts off at 15.0 °C. When the temperature of the water stops changing it's 23.1 °C. The pressure remains constant at 1 atm. container Calculate the mass of the polystyrene sample. Be sure your answer is rounded to 2 significant digits. Me g x10 X thermometer. 5 water sample a calorimeter

A chemical reaction takes place inside a flask submerged in a water bath. The water bath contains 6.30 kg of water at 22.3 °C. During the reaction 64.3 kJ of heat flows out of the flask and into the bath. - 1 -1 Calculate the new temperature of the water bath. You can assume the specific heat capacity of water under these conditions is 4.18 J'g *K '. Ве sure your answer has the correct number of significant digits. dlo

I need some help solving this question