alculate the formula mass for each of the following compounds. ZnCO3ZnCO3 Express your answer using two decimal places.   H2SO4H2SO4 Express your answer using two decimal places.   CBr4CBr4 Express your answer using two decimal places.   AlPO4AlPO4 Express your answer using two decimal places.

A substance composed of 2 or more elements in a fixed, definite proportion is considered a homogeneous mixture. a heterogeneous mixture. a molecular compound an alloy. a solution.

be sure your answer is correct and have the correct number of significant digits

What is the total number of atoms in a molecule of each of the following compounds? lauric acid, CH3(CH2)10 COOH Express your answer as an integer. ΕΠΙ ΑΣΦ Submit Previous Answers Request Answer X Incorrect; Try Again; One attempt remaining Part B arachidic acid, CH3(CH2)18 COOH Express your answer as an integer. Η ΜΕ ΑΣΦ ? atoms atoms Revie

A compound consists of elements combined in a fixed ratio. True or False

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An analytical chemist measures the amount of Elements E₁ and E₂ in four samples of an unknown Substance. sample of E1 1 2 3 mass mass of E2 4 16.0 g 9.1 g 17.1 g 9.8 g 18.5 g 10.6 g 12.0 g 6.9 g It's known that X contains no elements other than E₁ and E₂. Using this information, answer the questions in the table below. Is X a pure substance or a mixture? If you don't have enough information to decide, choose can't decide. If you said X is a pure substance, calculate the mass of Element E₁ the analytical chemist would find in a new 10.0 g sample of X. Round your answer to 2 significant digits. O pure substance O mixture O (can't decide) g

Aluminum alloys are the most used metal alloys by weight. Group of answer choices True False

Percentage Abundance. The element rubidium consists of two isotopes, one having an isotopic mass of 84.912 and the other having an isotopic mass of 86.920.  Determine the percentage abundance of the lighter isotope.  Record the answer to the correct number of significant figures. Show the numerical set-ups.  Include units and the correct number of significant figures in the set-up.

Calculate the number of hydrogen atoms in a 140.0 g sample of tetraborane (B,H0). Be sure your answer has a unit symbol if necessary, and round it to 4 significant digits. Oxto