What is the change in enthalpy when 26.0 g of Cr(s) is oxidized at 25 °C and 1 atm? The enthalpy of formation of chromium (III) oxide is ΔH =−1135 kJ/mol. 4 Cr(s) + 3 O2→ 2 Cr2O3

16. why must the number of electrons lost equal the number of electrons gained in every redox reaction? use 3 – 4 sentences in your own words to address this question. 18. what type of radiation is emitted when chromium-51 decays into manganese-51? show the nuclear equation that leads you to this answer. 19. a radioactive nucleus alpha decays to yield a sodium-24 nucleus in 14.8 hours. what was the identity of the original nucleus? show the nuclear equation that leads you to this answer.

Complete the following statements to describe solids, liquids, and gases. select the correct answer from each drop-down menu. a solid a definite volume and a definite shape. a liquid a definite volume and a definite shape. a gas a definite volume and a definite shape

Which subshell is represented by the actinides family?