This question wants us to identify the correct statements about octane. So, um, useful information to know before going into this question is that octane has a molar mass of 114.332 grams per mole. And we found that Just buy something. The weights of each Adam, which make up, Come in. And we know the carbon has a move atomic weight of 12.11 grams per mole and that hydrogen has an atomic weight of 1.8 grams per mole. So this first statement, um, 57.1 grams is equal to 0.5 moles of octane. And if you do the math and divide this weight in grams by our molar mass of octane, we should find that it is indeed approximately equal 2.5 moles. So this first statement is correct. Um, next, the question is saying that the compound is 84.1% carbon by weight. And, um, you can double check this by remembering that there are eight carbon atoms and when a molecule octane so then our percent by mass carbon can be calculated by multiplying the atomic weight of carbon by eight Dividing by the massive one mole of octane multiplying the result by 100 you should find it is indeed equal to 84.1 percent. Um, so this second statement is also true. Um, next is the empirical formula of the compound is found by see for age three. Um, this is incorrect. The correct empirical formula is C for H nine. Um, and next question stating that 57.1 grams of octane contains 28 grams of hydrogen. Um, and you can verify this by determining the percent weight of hydrogen. And since he had, you know, the percent weight of carbon, you can just take the difference room 100%. So if the compound is 84.1% carbon by weight than it must be 15 point, um nine, approximately 15.9% hydrogen by weight. And if you multiply 28 grams by that percentage, she'd find it equals to 9.69 grams of Haijun. So this statement this last statement is incorrect.