What charge does a shock on the doorknob have?

What is the number of moles of chemical units represented by 9.03x10^24? and how do i show work? (dumb it down )

This drawing shows a human body system. what is the primary function of this body system?

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