When iron metal reacts with sulfuric acid, it produces iron (iii) sulfate and hydrogen gas. balance the equation: fe + h2so4 ? fe2(so4)3 + h2. explain why it is necessary to balance chemical equations and why coefficients can be added to an equation, but subscripts cannot be changed.

2Fe + 3H2SO4 → Fe2(SO4)3 + 3H2.

Balancing chemical equations is essential because it explains how much of a certain chemical is needed for a reaction to occur. Coeffecients can be added because it's just showing how many molecules will be reacted or produced in a given equation. Subscripts can't be changed because that's messing with the type of chemical directly--not the amount of chemical. If you change subscripts, that would mean you're changing the properties of the substance at hand. For example, C2H5OH can get you drunk, while CH3OH can kill you with only a few mililiters. They have the same elements involved--it just matters how many of those elements you have in the equation.

1.consider the following balanced equation and answer parts a through. show calculations for each part.  

3 ag(s) + 4 hno3(aq) → 3 agno3(aq) + no(g) + 2 h2o(l)  

a. calculate the number of moles of agno3 produced by the reaction of 3 moles of ag with excess hno3. if the number to the left of the compound represents the number of moles of the compound which are present, then 3 moles of ag react with 4 moles hno3 to produce 3 moles agno3 (aq).

so the answer to a would be 3 moles.

b. calculate the number of moles of agno3 produced by the reaction of 108 grams of ag with excess hno3.  

i'm not sure how to plug in the grams of silver into an equation using moles to find how many moles are produced.

c. calculate the number of grams of agno3 produced by the reaction of 108 grams of ag with excess hno3  

d. calculate the number of moles of no produced as a byproduct of the reaction of 108 grams of ag with excess hno3.  

e. calculate the number of grams of no produced as a byproduct starting with 108 grams of ag and excess hno3.  

explanation:

chemistry sucks a**

explanation: