We have that he element X is
X= Titanium
From the question we are told that
XCl4 contains 74.8% Cl by mass
Hence for a 100g
Cl=74.8g
Mole of Cl=\frac{74.8}{35.5}
Mole of Cl=2.1
Meanin that 4 M of Cl=1 M of X
Generally the equation for the moles is mathematically given as
moles = \frac{mass}{ molar mass}
Where
mass of X=100-74,8=25.3
and
moles of X=\frac{2.1}{4}
moles of X=0.527
0.527= \frac{25.2}{ molar mass}
molar mass=47.8g
Therefore
Element with molar mass=47.8g is Titanium
Hence
X= Titanium
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