Enter your answer in the provided box. What is the mass number of an iron atom...
Enter your answer in the provided box. An iron bar has a mass of 543 g. After the bar had been standing in air for a month, exactly one-eighth of the iron turned to rust (Fe2O3). Calculate the final mass of the iron bar and the rust.
Enter your answer in the provided box. An iron bar of mass 719 g cools from 92.0°C to 4.0°C. Calculate the metal's heat change (in kilojoules) kJ
Enter your answer in the provided box. The electron in a ground-state H atom absorbs a photon of wavelength 93.78 nm. To what energy level does the electron move?
Enter your answer in the provided box. What is the total number of orbitals associated with the principal quantum number n=2?
Enter your answer in the provided box. What mass of KI is dissolved in 600.0 g of a solution that is 35.0% KI by mass? g KI KPrev 14 of 32l Next
Enter your answer in the provided box. What mass of ethylene glycol must be added to 1545 g water to raise the boiling point to 104.7°C?
Enter your answer in the provided box. What is the wavelength (in nanometers) of a photon emitted during a transition from n = 7 to ne=3 state in the H atom? x 10
Enter your answer in the provided box. What mass of insulin must be dissolved in 39.0 mL of water to produce a solution with an osmotic pressure of 16.1 mmHg at 25°C? The molar mass of insulin is 5808 g/mol. answer in g.
due soon! Enter your answer in the provided box. A ground-state H atom absorbs a photon of wavelength 94.98 nm. What higher energy level did the electron reach?
Enter your answer in the provided box. Before arc welding was developed, a displacement reaction involving aluminum and iron(III) oxide was commonly used to produce molten iron (the thermite process). This reaction was used, for example, to connect sections of iron railroad track. Calculate the mass of molten iron produced when 2.28 kg of aluminum reacts with 15.4 mol of iron(III) oxide. Enter your answer in scientific notation. *10g Fe