I am first going to write the question...
An unknown binary compound containing fluorine(XFn) has a density as a gas that is 1.777 times that of argon at the same condition. When 3.650 * 10-2 mol of this compund reacts with excess sulfur, 2.666 g of SF6 is poduced. Find the value n in XFn and identify element X.
MM/g mol-1 SF6= 146.06 S= 32.07 F= 19.00 Ar = 39.95
that was the question.. this is what i found..
MM of XFn= 70.7115
g of XFn added= 2.5912
XFn+ S = SF6
The rest all i am confused.. please help guys.. please..