Balance like following equation: (Use the smallest whole numbers possible.) B_2
ID: 989531 • Letter: B
Question
Balance like following equation: (Use the smallest whole numbers possible.) B_2 S_3(s) + H_2O (l) rightarrow H_2 BO_2 (aq) + H_2S(g) Determine the formula weight of nitroglycerin. C_3 H_8 O_3. a powerful explosive used to male dynamite. Calculate the percentage by mass of oxygen in. barium sulfite. The compound salicylic acid is a chemical which is found in. the bark of willow trees, and is used to make aspirin. The chemical formula of salicylic acid is C_7 H_8 O_3. How many hydrogen. atoms are present in. 58.1 mg of salicylic acid? (Avogadro's number is N_A = 6.022 Times 10^23)Explanation / Answer
9) Balance equation
B2S3(s) +6H2O(l)2 H3BO3(aq)+3H2S(g)
10) Formula weight of nitroglycerin C3H8O3 = 3*12 +8*1 +3*16 = 36+8+48 =92 g/mol
11) Percentage by mass of oxygen in BaSO3 = MW of atom/MW of compound*100
(MW of BaSO3 =137.3 +32+3*16 =217.3 g/mol)
= 48/217.3*100 = 22.08%
12) 1 mole contains 6.023 *1023 atoms
58.1 mg(0.0581 g) of salycilic acid means
no of moles = weight / Mw = 0.0581/138 = 4.21 x 10-4 moles
In salycilic acid 6 hydrogen atoms are there
no of hydrogen atoms in 4.21 x 10-4 moles of salycilic acid =6 x 4.21 x 10-4 moles x 6.023 *1023 atoms
= 1.521 x 1021atoms
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