What is the mass of a 0.148 mol sample of sodium hydroxide? 40 g 270 g 162 g 5.9

Question

What is the mass of a 0.148 mol sample of sodium hydroxide? 40 g 270 g 162 g 5.9 g 0.17 g A new element. Tyserium (Ty). has recently been discovered and consists of two isotopes. One isotope has a mass of 331 amu and is 35.0 % abundant. The other isotope is 337 amu and is 65.0 % abundant. What is the mass of Ty as it appears on the periodic table? 332 amu 333 amu 334 amu 335 amu 336 amu Vitamin E was subjected to combustion analysis and it is then calculated to an empirical formula of C_3H_4O_3. The molar mass of vitamin U has been be 264 g/mol. The molecular formula for vitamin E is: CH_2O C_3H_4O_3 C_6H_6O C_6H_8O C_9H_12O_9

Explanation / Answer

1) D

mass = moles x mwt = 0.148 x 40 g/mol = 5.9 g

2) D

mass = 331 x 0.35 + 337 x 0.65 = 335 amu

3) E

molecular formula = (C3H4O3)n

n = molar mass / empirical formula mass = 264 / 88 = 3

Hence,

molecular formula = (C3H4O3)3 = C9H12O9

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