moles based on the givern 2. For the following problems, you need to calculate t
ID: 547017 • Letter: M
Question
moles based on the givern 2. For the following problems, you need to calculate the number of number of grams, and using the molar masses that you calculated in problem 1. a. 15.0 grams of K:0 K2 39-78 b. 0.25 grams of CCl c. 1.4 grams of H280 d. 45 grams of NaOH e. 0.025 grams of CoCls 3. For the following problems, you need to calculate the number of grams based on the given number of moles, using the molar masses calculated in problem 1. a. 0.25 moles of AbS3 b. 4.1 moles of N20s c. 6.6 moles of HNO2 d. 0.005 moles of Mg(OH)2 e. 9.0 moles of Fe2OsExplanation / Answer
2.
a) 15.0 g of K2O
Molar mass of K2O = 2*K + O = 2*39 + 16 = 94 g/gmol
Number of moles = 15/94 = 0.159moles
b) 0.25 g CCl4
Molar mass of CCl4 = 1*C + 4*Cl = 1*12 + 4*35.5 = 154g/gmol
Therefore number of moles = 0.25/154 = 0.0016 mol
3.
a) 0.25 moles Al2S3
Molar mass of Al2S3 = 2*Al + 3*S = 2*27 + 3*32 = 150g/gmol
Mass of the compound = 0.25*150 = 37.5 g
b) 4.1 mol N2O5
Molar mass of N2O5 = 2*N+5*O = 2*14 + 5*16 = 108g/gmol
mass of the compound = 4.1*108 = 442.8g
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