FREE POINTS What coefficient is needed to balance this equation? Fe + 4H2O --> Fe6O4 + 4 H2

a) 2
b) 10
c) 6
d) 8

Which of these would be caused by a chemical change? a) the formation of lava. b) sedimantary rock layering over time. c) metamorphic rock forming from igneous. d) metamorphic rock eroding to form sedimentary rock.

How many moles are in 7.2 x 10^23 carbon molecules? (*round to the nearest hundredth and include the unit "mol c" after your number) question 6 options:

How heavy is thanos? a) 3000 lbs b) all of it c) the price of tea in china d) heavy enough