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If the fifth term of a geometric sequence is 81 and the common ratio is 3/4, find the sum of the first 20 terms? How do i confirmed the identity of a person saw over the internet? The empirical formula of hydrazine is NH2, and its molecular mass is 32.0 grams. What is its molecular formula? If an object with a mass of 35 grams has a volume of 70cm cubed and its length is 40cm, what is the density of the object? How many atoms are in 7.10 mol of copper (II) phosphate?