One of the First Nuclear Bombs Based on the Fission

Multiple Choice

One of the first nuclear bombs based on the fission of U-235 had a maximum yield of 7.5 x10¹³ J.If the fission of U-235 releases 1.8 × 10¹³ J/mol,approximately what mass of U-235 was used in this bomb? (U-235 has a molar mass of 235.04 g/mol)

A) 9.8 × 10² g U-235
B) 56 g U-235
C) 0.018 g U-235
D) 0.0010 g U-235
E) 2.3 × 10² g U-236