chemistry
The mass of a sample of boron atoms is 5.60 g. How many boron atoms are in this sample? Show your work here.
chemistry
deltaE=q+w q=570J w=-PdeltaV 1 atm = 1.01235 x 10^5 Pa 1,000 L = 1 m^3 .76L*1.01235*10^5Pa=76938.6 that is the answer i got but it said it was wrong and idk why
chemistry
The air within a piston equipped with a cylinder absorbs 570J of heat and expands from an initial volume of 0.12L to a final volume of 0.88L against an external pressure of 1.0 atm. What is the change in internal energy of the air within the piston?
chemistry
18.02g*4.18J/g*C*-3.9=-293.76204 -293.76204/1.25=-235.009632 -235.009632*80.6=-18941.77634J/mol -18941.77634J/mol=-18.94177634kJ/mol
chemistry
i tried using that formula and keep getting it wrong but i dont know why.
chemistry
Instant cold packs, often used to ice athletic injuries on the field, contain ammonium nitrate and water separated by a thin plastic divider. When the divider is broken, the ammonium nitrate dissolves according to the following endothermic reaction: NH_4NO_3(s) rightarrow NH_4...
chemistry
what is Ccal?
chemistry
When 0.558g of biphenyl (C_12H_10) undergoes combustion in a bomb calorimeter, the temperature rises from 25.7^\circ C to 30.1^\circ C. Find DeltaE_rxn for the combustion of biphenyl in kJ/mol biphenyl. The heat capacity of the bomb calorimeter, determined in a separate experi...
chemistry
The air within a piston equipped with a cylinder absorbs 570J of heat and expands from an initial volume of 0.12L to a final volume of 0.88L against an external pressure of 1.0 atm. What is the change in internal energy of the air within the piston?
chemistry
How much heat is necessary to change a 52.0 g sample of water at 33 degrees celsius into steam at 110 degrees celsius?
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