Answer:
28.0 grams CsF
Explanation:
To find the mass of CsF, you need to (1) convert grams CsXeF₇ to moles CsXeF₇ (via molar mass), then (2) convert moles CsXeF₇ to moles CsF (via mole-to-mole ratio from equation coefficients), and then (3) convert moles CsF to grams CsF (via molar mass). It is important to arrange the ratios/conversions in a way that allows for the cancellation of units. The final answer should have 3 sig figs to match the sig figs of the given value.
Molar Mass (CsF): 132.91 g/mol + 18.998 g/mol
Molar Mass (CsF): 151.908 g/mol
Molar Mass (CsXeF₇): 132.91 g/mol + 131.29 g/mol + 7(18.998 g/mol)
Molar Mass (CsXeF₇): 397.186 g/mol
1 CsF + XeF₆ -----> 1 CsXeF₇
73.1 g CsXeF₇ 1 mole 1 mole CsF 151.908 g
---------------------- x -------------------- x ------------------------ x ------------------ =
397.186 g 1 mole CsXeF₇ 1 mole
= 27.958 g CsF
= 28.0 g CsF
