How many moles of h2o will be produced from 42.0g of h2o2? i need the equations for what to do because i am not sure how to do it.

Hey there!

Molar mass:

H2O2 = 34,01 g/mol

H2O = 18,01 g/mol

By the stoichiometry of the reaction:

2 H2O2 = 2 H2O + O2

2 * 34,01 g H2O2 2 * 18,01 g H2O

42,0 g H2O2 m

m = ( 42,0 * 2 * 18,01 ) / ( 2 * 34,01 )

m = 1512,84 / 68,02

m = 22,24 g H2O

Therefore:

1 mole H2O 18,01 g

?? moles H2O 22,24 g

moles H2O = 22,24 * 1 / 18,01

moles H2O = 22,24 / 18,01

moles H2O = 1,23 moles

Hope this helps!

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e

c is the answer because when something is left after something evaporates that shows the chemical change.