What mass of sodium could be produced by the reaction of 3.30x1025 atoms of calcium with excess sodium nitrate?

The reactions shown here can be combined to make the overall reaction c(s) + h2o(g) ⇌ co(g) + h2(g) by reversing some and/or dividing all the coefficients by a number. a. c(s) + o2(g) → co2(g) k=1.363×10^69 b. 2 h2(g) + o2(g) → 2 h2o(g) k=1.389×10^80 c. 2co(g) + o2 (g) → 2 co2(g) k=1.477×10^90

Calculate the number of kilojoules to warm 125 g of iron from 23.5°c to 78.0°c.

Which electron configuration represents the electrons in an atom of sodium in the ground state at stp