Write an Android app to perform chemistry conversions

I need an Android app developed that performs chemistry conversions. This app will need to perform calculations based on user input. APK and source code must be provided to when project is complete. Design must leave space at bottom of app for banner ad to be placed. App name is Easy Chemistry Conversions. NOTE: Please see attached images to illustrate GUI and user flow in the app. Project Requirements The user will first enter the Compound/element. Element/compound Total Molar Mass is calculated by the app based on Atomic Weight of each element in compound. Here is a sheet with the Atomic Weights for each element: [login to view URL] Example: H2O H2: (1.007975 x 2) = 2.0160 O: 15.9994 (H2) 2.0160 + (O) 15.9994 = 18.01535 Round to four decimals: 18.0154 Total Molar Mass: 18.0154 g/mol The user then has to enter one of the following fields: Grams Moles Molecules (Atoms) NOTE: If user enters Molecules (Atoms) they must be able to enter scientific notation format. Example: 3.3428 x 10^23. This can displayed as 10^23 or 10E23. After the user enters the value, the app completes the calculation Example: 1 Gram of H2O Grams / Molar Mass = Moles 1.000 / 18.0154 = 0.0555 Round to four decimals: 0.0555 Example: 0.0555 Moles of H2O Moles x Molar Mass = Grams 0.0555 x 18.0154 = 0.9998547 Round to four decimals: 1.0000 Grams Moles x (6.02214086 × 10^23) = Molecules (Atoms) NOTE: 6.02214086 × 10^23 is hardcoded value for Avogadro constant 0.0555 x (6.02214086 × 10^23) = 3.34277388 x 10^22 Round to four decimals: 3.3428 x 10^23 NOTE: These are the formulas the app will need to compute noted above: Total Molar Mass = Sum of Atomic weight of Compound/elements the user inputs. Grams / Molar Mass = Moles Moles x Molar Mass = Grams Moles x (6.02214086 × 10^23) = Molecules (Atoms)