5.25 calories are absorbed by an iron nail. How many joules is this?

Calories per gram ($"Cal/g"$) implies calories per gram associated with those calories. A change-in-food mass is associated with the $"Cal/g"$ units, and just like a change in position in $"m"$...

You have 960 J in that many calories. To go from calories to Joules, or vice versa, use the fact that 1 calorie is equivalent to 4.184 J. Use...

So, $148 " calories"xx4.1854 " Joule calorie"^-1$ $=$ $??$ $"Joule"$

So, we do the conversion: $500cancel" Calorie"$ $xx$ $4.1854$ $J*cancel"calorie"^-1$ $=$ $?? J$

The idea here is that the specific gravity of a substance is calculated by dividing the of that substance by the density of a reference substance, which is usually water...

To identify the independent and dependent variables you need to first identify what the variables are. Then you ask yourself, which variable will be affected if anything is changed? For...

Reactive metals displace unreactive metal ions from their . Iron in the first nail was capable of reducing and displacing copper ions in the $"Cu" "SO"_4$ solution indicating that $"Fe"$...

And this is the effectual chemical reaction of our civilization. If you ever have a chance to tour a blast furnace (and most are in China and India now) do...

Balanced equation $"4Fe(s) + 3O"_2("g")"$$rarr$$"2Fe"_2"O"_3("s")"$ Multiply the given moles of iron by ratio between oxygen and iron from the balanced equation, with moles oxygen in the numerator. $6.4color(red)cancel(color(black)("mol Fe"))xx(3"mol O"_2)/(4color(red)cancel(color(black)("mol...

We have the balanced equation: $4Fe(s)+3O_2(g)->2Fe_2O_3(s)$ And so, $4$ moles of iron react with $3$ moles of oxygen, and therefore, $12.9 \ "mol"$ of iron would react with: $12.9color(red)cancelcolor(black)("mol" \...