Question #10db8
1 Answer
Explanation:
The thing to remember about the density of a substance is that it represents the mass of exactly one unit of volume of said substance.
"density" = "mass of substance"/"1 unit of volume"density=mass of substance1 unit of volume
In your case, the density of helium at STP is equal to
"0.1875 g L"^(-1) = "0.1875 g"/"1 L"0.1875 g L−1=0.1875 g1 L
Now, you know that the volume of the balloon is equal to
Since you already know that you get
1.5 * 10^9 color(red)(cancel(color(black)("L"))) * overbrace("0.1875 g"/(1color(red)(cancel(color(black)("L")))))^(color(blue)("the density of helium at STP")) =color(darkgreen)(ul(color(black)(2.8 * 10^8color(white)(.)"g")))
The answer is rounded to two sig figs, the number of sig figs you have for the volume of the balloon.