Hydrogen reacts with .771 g of carbon to form .90 g of a compound. What is the mass percent of hydrogen in the compound?
1 Answer
Explanation:
In order to find the mass percent of hydrogen in this compound, you must determine how many grams of hydrogen you'd get in
In your case, you know that an unknown mass of hydrogen reacts with
Use the total mass of the hydrocarbon to determine how many grams of hydrogen reacted with the carbon
#m_"hydrocarbon" = m_(C) + m_(H)#
#m_(H) = "0.90 g" - "0.771 g" = "0.129 g"#
Now, if
#100 color(red)(cancel(color(black)("g hydrocarbon"))) * "0.129 g H"/(0.90color(red)(cancel(color(black)("g hydrocarbon")))) = "14.33 g H"#
So, if
#"mass percent H" = color(green)(|bar(ul(color(white)(a/a)"14.3%"color(white)(a/a)|)))#
I'll leave the answer rounded to three sig figs.