Multiple Choice. Encircle the letter of the correct answer. 1. A chemical formula that shows the actual number and kind of atoms present in one molecule of a compound is called A. Covalent formula B. Empirical formula C. Ionic formula D. Molecular formula 2. A formula with the lowest whole number ratio of elements in a compound is called A. Chemical formula B. Distance formula C. Empirical formula D. Molecular formula 3. What is the molecular formula if the empirical formula is CH2O and the molecular mass is 180.18? A. CH2O В. С2Н4О2 C. C4H8O4 D. C6H12O6

Q: How many molecules are in each sample?

A: Given is, Mass of glucose = 14 g We know, Molar mass of glucose = 180.156 g/mol

Q: Element Moles Number of Atoms Ne 0.466 Ar Xe He 1.90 3.78x1024 1.28×1020

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Q: Match the correct answer(s). A gaeous atomic element A. Helium * Polyatomic ion B. sulfur dioxide *…

A: Polyatomic ion : The ion in which more than one  atoms is present, is called as polyatomic ion.

Q: Data Table 1: Binary Molecular and lonic Compound Names Compound Name #3 Formula Molecular or lonic…

A: Since you have posted question with multiple sub-parts, we are entitled to answer the first 3 only.…

Q: . What is the percent by mass (percent composition) of each element with then the compound magnesium…

A: 1) What is the percent by mass (percent composition) of each element with then the compound…

Q: ne number of atoms

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Q: 2) a) Write formulas for the figures. Dark circles represent element A and light circles represent…

A: Atomic element : Atomic element have single atoms as their basic unit. Molecular element : The…

Q: QUESTION 10 An oxide of iron has the formula Fe 30 4. What mass percent of iron does it contain? O…

A: Formula of the compound is Fe3O4. Molar mass of Fe3O4 = 231.53g/mol

Q: inside the front cover of this book to calculate the mass in grams of each of the following samples.…

A: Note : As per our guidelines we are supposed to answer only first 3 subparts of first question.

Q: 3. A student obtained the following data for a sample. The sample dissolved in water The sample…

A: A bond is defined as the attractive forces which holds two or more atoms together in stable molecule…

Q: Using your correct formula for copper chloride writes a balanced equation for the reaction that took…

A: Given : mass of copper chloride = 1.750 gram  To find : balanced chemical equation.  Solution : As…

Q: : How many atoms of oxygen are in 3.52 moles of calcium nitrate? A. 1.91 x 10^25 atoms O B. 2.12 x…

A: E. 1.27×1025 atoms of Oxygen Given that,  Moles of Ca(NO3)2   = 3.52 mol Moles of Oxygen in 3.52 mol…

Q: 5. A 295 g sample of unknown metal is at an initial temperature of 13.00 °C absorbs 75.0 kJ. The…

A: Note: Since you have asked multiple questions, we will solve the first question for you. If you want…

Q: Knowledge Check 2.2 Predict whether the bond between the pair of atoms will be ionic, polar…

A: Since you have asked multiple question, as per our company guidelines we are supposed to answer the…

Q: 1- A Sample of a compound containing only carbon, chlorine, and fluorine was analyzed and found to…

A: Given: Mass of carbon = 0.323g Mass of Cl = 2.38g Mass of F=0.255g We know that Molar mass of…

Q: The Avogadro constant is defined as: A The number of atoms in exactly 1gof carbon-12 B The number of…

A: The Avogadro constant (NA) is the proportionality factor that relates the number of constituent…

Q: One mole of oxygen molecule (02) contains how many atoms of oxygen? a. 6.022 × 1023 O b. 1,6021 ×…

A: We have to tell the no. Of oxygen atom in 1 mole

Q: What is the number of molecules in 319g of Li2SO4? (Take NA = 6 x1023)

A: The question is based on mole concept. We have  to determine number of molecules present in the…

Q: Classify each compound as ionic or molecular. a. CO2 b. NiClz c. Nal d. PCl,

A: Ionic solids are made up of positive and negative ions and these ions are held together by…

Q: How many hydrogen atoms are in the molecule below?

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Q: FIOW TTa ly How many grams of aluminum oxide (Al, O) are equal to 6.32 x 1023 formula units?

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Q: Theoretically, should the experimental mass percent water values for everyone who used the same…

A: Answer is yes  If everyone is calculating the percent mass of water in the same hydrate the answers…

Q: 27. A compound is 75.7% arsenic and 24.3% oxygen by mass. empirical formula? 75.7 What is the

A: Given, mass of arsenic(As) = 75.7 % = 75.7 g mass of oxygen(O) = 24.3 % = 24.3 g

Q: MCQ 8: The molecular formula of different compounds shows actual numbers of A. atoms B. molecules C.…

A: Molecular formula describe the actual number and type of atom in a single molecule of a compound.

Q: H₂O C. CH4 burning Q13. The correct name of HI(aq) is? A. lodic acid C. Hydrogen iodide D. Benzene…

A: Q. 13 as specified by the student.  Correct name of HI(aq) is :

Q: How many iron ions are present in 43.6 g of Fe203? Select one: O a. 1.64 x 1023 ions O b. 2.63 x…

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Q: Calculate the mass of 500. atoms of  fluorine (F). Mass =______  g

A: One mole of a substance is equal to 6.023 x 1023 units of that substance  (such as atoms, ions or…

Q: 2. Consider the compound potassium hypochlorite. a. Write out the formula for potassium…

A: 2. We have to answer the following questions Write the formula of the potassium hypochlorite.…

Q: How many hydrogens are in the following molecule? A.10 B.8 C.6 D.5

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Q: You have 53 carbon atoms. What is the mass? Which units should you use g/mol or amu? a. 686.58 amu…

A: Answer: No option is correct. The correct answer is 636.53 amu We should use amu unit instead of…

Q: How many grams of Se are there in a sample of Se that contains the same number of moles as a 65.8…

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Q: Determine the number of moles in the given amount of each substance. Show or explain your work. a.…

A: 1 mole of any element / compound contains 6.02 * 1023 atoms / molecules  of that substance. Mass of…

Q: Q12. Which of the following does involve a chemical change? A. Dissolving NaBr in H₂O C. CH4 burning…

A: Physical changes are temporary or reversible change. When a substance undergoes a physical change,…

Q: The formula for sulfur dioxide is . A. How many molecules are in 2.64 grams of sulfur dioxide?…

A: The formula for Sulfur dioxide is :                    SO2 Given:For part Agiven mass of SO2…

Q: 1. How many ATOMS of carbon are present in 7.87 grams of carbon tetrabromide, CBR4? atoms of carbon

A: Since you have asked multiple question, we will solve the first question for you. If you want any…

Q: 10. What does Avogadro's number represent? a. the number of atoms in 1 mol of an element b. the…

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Q: What is a mole? How is the mole concept useful in chemical calculations?

A: Mole Mole is a quantity that represents a collection of 6.022×1023 atoms or molecules. The term…

Q: I need help with only figure 1 and the question

A: The diagram is of Hydrogen molecule.

Q: 9. An unknown compound, X, is 63.56% Carbon, 6% Hydrogen, 9.26% Nitrogen and 21.17% Oxygen. a. Find…

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Q: If you were to find the molecular formula of a compound, you would need the ________ of the…

A: We have to find the possible terms for the blank. If you were to find the molecular formula of a…

Mole Concept

Mole concept is a method to determine the amount of any substance that consists of some elemental particles using a grouping unit called ‘mole’. The mole concept enables one to handle the large amount of small elementary particles. The mole concept can be used in many calculations related to mole calculation, molar amount, mole ratio, and so on, which are significant in chemistry.