Question

10) 10) Consider the hypothetical reaction: 3A2 + 2B - C + 2D Ir 6.0 moles of A are mixed with 2.0 moles of B, what is the maximum amount of C that can be formed? A) 6.0 mol B) 8.0 mol C) 2.0 mol D) 1.0 mol E) 5.0 mol 11) What is the mass of 4.35 moles of aluminum? A) 9.78 x 1022 B) 2.62 x 1024 g C) 0.1638 D) 1178 E) 27.8 g 12) 12) Choose the best classification of the reaction represented by the following equation: 2Fe3+ (aq) + Fe(s) - 3Fe2+(ag) A) oxidation-reduction B) combustion C) decomposition D) precipitation E) acid-base 13). 13) Prozac, a drug prescribed to treat depression, has the formula C17H18F3NO. If a patient was administered 15.0 mg of Prozac, how many moles of Prozac did he receive? [Molar mass: Prozac, 309.36 g/mol) A) 20.6 mol B) 48.5 mol C) 2.92 x 1019 mol D) 4.85 x 10-5 mol E) 4640 mol 14) How is the reaction shown below best classified? 14)_ 2NaCl(s) + F2(8) 2NaF() + Cl2(9) A) single-replacement B) combination C) precipitation D) double-replacement E) decomposition 15) - 5) How many molecules of water are present in a 5.65 mole sample of water? A) 9.39 x 10-24 molecules B) 1.07 * 1023 molecules C) 3.40 x 1024 molecules D) 4.00 x 1025 molecules E) 4.00 x 1024 molecules

Answer 1

10)
Balanced chemical equation is:
3 A2 + 2 B ---> C + 2 D


3 mol of A2 reacts with 2 mol of B
for 6 mol of A2, 4 mol of B is required
But we have 2 mol of B

so, B is limiting reagent
we will use B in further calculation

According to balanced equation
mol of C formed = (1/2)* moles of B
= (1/2)*2
= 1 mol
Answer: D

11)

Molar mass of Al = 26.98 g/mol

use:
mass of Al,
m = number of mol * molar mass
= 4.35 mol * 26.98 g/mol
= 117 g
Answer: 117 g

Only 1 question at a time please