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Name the polyatomic ion, Cr2O72-.

What is the answer to the question below using the correct number of significant figures? 120.231 – 18.9 = ?

Academic Honor Pledge I agree to abide by Huntingdon College’s Honor Code while completing this assignment.  I will also report any circumstances and/or instances to the instructor that may compromise the integrity of this exam.  The instructor reserves the right to not grade this exam without a signature below.  Answer “True” if you agree with this statement.

You have 1.486 × 1023 atoms of helium (He). How many moles of helium do you have?

The molar mass of water is 18.02 g/mol. Given 66.29 g of water, how many moles of water do you have?

The molar mass of methane is 16.04 g/mol. Given 81.33 g of methane, how many moles of methane do you have?

What is 1.2839 × 104 in decimal notation?

Sugar water in a recently stirred glass is an example of …

What is the name of MgSO4 · 7 H2O?

What is the name of the acid, H3PO4?