i need help for the three questions

Consider the reaction 2N2(g)+O2(g)2N2O(g) Using the standard thermodynamic data in the tables linked above, calculate Grxn for this reaction at 298.15K if the pressure of each gas is 41.48mmHg. ANSWER: k/mol Consider the reaction CO(g)+3H2(g)CH4(g)+H2O(g) Using the standard thermodynamic data in the tables linked above, calculate G for this reaction at 298.15K if the pressure of each gas is 21.10mmHg. ANSWER: kJ/mol Consider the reaction N2(g)+3H2(g)2NH3(g) Use the standard thermodynamic data in the tables linked above. Calculate G for this reaction at 298.15K if the pressure of NH3(g) is reduced to 12.40mmHg, while the pressures of N2(g) and H2(g) remain at 1 atm. ANSWER: kJ/mol