15. Given the equation: BezC + 4 H2O → 2 Be(OH)2 + CH4, How many moles of beryllium carbide, Be2C, are needed to react with 1.881 moles of water? (6 pts)
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Which of the following elements would you expect to have the lowest ionization energy value? fluorine, lithium, neon, nitrogen

What is the typical rotational frequency frot for a molecule like n2 at room temperature (25∘c)? assume that d for this molecule is 1å=10−10m. take the total mass of an n2 molecule to be mn2=4.65×10−26kg. you will need to account for rotations around two axes (not just one) to find the correct frequency. express frot numerically in hertz, to three significant figures.

Determine the mass of the object below with accuracy and to the correct degree of precision. a. 324.2 g b. 324 g c. 324.30 g d. 324.25 g