Radium is a radioactive element that decays into radon gas. it’s a Tomic mass is 226. How many moles in 500 grams of radium?

Esign techniques and materials that reduce the negative environmental impact of a structure are referred to as

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

If anyone would be able to me out with these three questions it would be these are from the chem 2202 course.