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How many valence electrons does an arsenic atom have?

Sulfur hexafluoride is produced by reacting elemental sulfur with fluorine gas. S 8(s) + 24 F 2(g) → 8 SF 6(g) What is the percent yield if 18.3 g SF 6 is isolated from the reaction of 10.0 g S 8 and 30.0 g F 2? Written work required.

Potassium hydrogen carbonate decomposes according to the reaction below: 2 KHCO3(s)  →  K2CO3(s) + CO2(g) + H2O(l) How many moles of potassium carbonate are produced if 311 g of potassium hydrogen carbonate is heated?

Consider the fermentation reaction of glucose: C6H12O6 → 2C2H5OH + 2CO2 A 1.00-mol sample of C6H12O6 was placed in a vat with 100 g of yeast. If 37.0 g of C2H5OH was obtained, what was the percent yield of C2H5OH? Written work required.

A pure substance composed of two or more different elements is a(n) ________. Written work required.

How many valence electrons are present in the Lewis formula for the hypochlorite ion, ClO–? Show your work in the submitted scratch paper

What is the O−C−N bond angle in OCN–? Show your work in the submitted scratch paper

You may use the following tables as needed to answer certain questions. VSEPR Table(1).JPGElectronegativity table(1).PNG  

The central atom in N2O is a nitrogen atom. This nitrogen atom is surrounded by Show your work in the submitted scratch paper

According to VSEPR theory, which of the following is the correct statement concerning the electron-pair geometry and the molecular geometry of sulfur dioxide? Show your work in the submitted scratch paper