Rust has the formula Fe2O3 and it’s made from iron metal rea…

Rust has the formula Fe2O3 and it’s made from iron metal reacting with oxygen over time.  Assume you had a 2.0 g block of pure iron metal that fully oxidized to rust and the mass of that rust product was 6.5 g.  What must have been the mass of oxygen initially reacting with the pure iron?   *give numerical answer, no unit required

Read the following program and write down the output of the…

Read the following program and write down the output of the program when it is executed. class Odometer { public:  // ====================== // setFuelEfficiency // Sets the fuel efficiency in miles per gallon. // ====================== void setFuelEfficiency(double newEfficiency) {             fuel_efficiency = newEfficiency; } // ====================== // reset // Resets the odometer reading // ====================== void reset() {       miles = 0; }   // ====================== // addMiles // Log additional miles to the odometer. // ====================== void logMiles(int additionalMiles) {       miles += additionalMiles; }   // ====================== // gasConsumed // Calculates the gallons of gas consumed on the trip. // ====================== double gasConsumed() {       return (miles / fuel_efficiency); }   private:       int miles;       double fuel_efficiency; }   public class OdometerApp { static void main(String[] argv) {   // Two test trips   Odometer trip1, trip2;     trip1.reset();   trip1.setFuelEfficiency(45);   trip1.logMiles(100);   System.out.println(“For your fuel-efficient small car:”);   System.out.println(“After 100 miles, ” + trip1.gasConsumed()+ ” gallons used.”);   trip1.logMiles(50);   System.out.println(“After another 50 miles, ” + trip1.gasConsumed() +   ” gallons used.”);   trip2.reset();   trip2.setFuelEfficiency(13);   trip2.logMiles(100);   System.out.println(“For your gas guzzler:”);   System.out.println(“After 100 miles, ” + trip2.gasConsumed() + ” gallons used.”);   trip2.logMiles(50);   System.out.println(“After another 50 miles, ” + trip2.gasConsumed() +     ” gallons used.”); } }