Question

The density of hydrogen is approximately 9 × 10-5 , while the density of helium is approximately 2 × 10-4 .

Answer 1

Answer:

Two times the density of hydrogen   =   18 x 10^-5

Step-by-step explanation: Two times the density of hydrogen   =   18 x 10^-5    is ALMOST 20 x 10^-5    or 2 x 10^-4

SO the first statement is correct.