Answer:
A cold front is a boundary or zone that separates two air masses. The cooler more dense mass replaces the warmer.
hope this helps :)
Explanation:
Put a 2 on the HCl.
2HCl+Ba-->BaCl2+H2
Pure substance element I think
The answer is B, sodium is an element.
The molar mass of the unknown compound is calculated as follows
let the unknown gas be represented by letter Y
Rate of C2F4/ rate of Y = sqrt of molar mass of gas Y/ molar mass of C2F4
= (4.6 x10^-6/ 5.8 x10^-6) = sqrt of Y/ 100
remove the square root sign by squaring in both side
(4.6 x 10^-6 / 5.8 x10^-6)^2 = Y/100
= 0.629 =Y/100
multiply both side by 100
Y= 62.9 is the molar mass of unknown gas