Chemistry Answers

As a air balloon cools down it's composed by the air around it for this process identify the sign of the heat the change in internal energy and the work. Explain your answer

State the first and the second law of thermodynamic in your own word ?

A system undergoes a process consisting of the following two steps

Step 1:the system absorbs 73 J of heat while 35 J of work done is done on it.

Step 2: the system absorbs 35 of j heat while performing 72 J of work

Calculate the change in internal energy for the overall process?

How many moles is 2.80x10²⁴ atoms of silicon? 

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The decomposition reaction of NOBr is second order in NOBr, with a rate constant at 20°C of 25 M1 min 1. If the initial concentration of NOBr is 0.025 M, find

(a) the time at which the concentration will be 0.020 M.

Calculate the volume of oxygen involved at room temperature and pressure when 0.01 mole of potassium chlorate is decomposed

Calculate the AH°m for the reaction 2S+20F₂ (0) using the following thermochemical reactions: 2(0) 1 SO₂+ SF

Calculate the AH°m for the reaction 2S+20F₂ (0) using the following thermochemical reactions: 2(0) 1 SO₂+ SF

Calculate the AH°m for the reaction 2S+20F₂ (0) using the following thermochemical reactions: 2(0) 1 SO₂+ SF

how many moles of pb(no3)2 are required to react with 10L of 31 m of kcl