Concept explainers
Interpretation:
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Concept Introduction:
Chemical formula of a substance can be interpreted in two different ways, namely, in microscopic-level and macroscopic-level. Chemical formula at microscopic-level can be said as the one that indicates the number of atoms of different elements that is present in a formula unit or one molecule of substance. The numerical value present in subscripts in a chemical formula indicates the number of atoms of various elements that is present in one formula unit of substance.
In macroscopic-level the chemical formula of a substance indicates the number of moles of atoms of different elements that is present in one mole of a substance.
Conversion factors which relate a component of a substance to the substance as a whole are dependent on the chemical formula of the substance.
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EBK GENERAL, ORGANIC, AND BIOLOGICAL CH
- The number of atoms present in 1 mole of P atoms is a. 6.02 1021 b. 6.02 1023 c. 6.02 1025 d. no correct responsearrow_forwardWhich of the following chemical formulas fits the description number of elements present and number of atoms present are the same? a. HClO2 b. C2H2Cl2 c. H2O2 d. no correct responsearrow_forwardIn which of the following unbalanced equations are five moles of reactants required to produce two moles of products? Na + N2 --> NaN3 O Al + S --> A12S3 O N2 + H2 --> NH3 O more than one correct responsearrow_forward
- 4. A solution is made by dissolving 15.3g of solid KCl (formula wt. = 74.6 u) in enough water to give 125mL of solution. What is the molar concentration of KCl in the resulting solution? a. 1.64 b. 0.205 c. 0.164 d. 0.122 e. no correct responsearrow_forward3. Which of the following chemical reactions is a nonredox reaction? HIDE ANSWER a. b. SO3 + H₂O → H₂SO4 C. Ca+S → CaS d. 2NO+ O2 → 2NO₂ no correct responsearrow_forwardThe following reaction occurs in your car's exhaust system catalytic converter:Heat + 2CO + O2 + Pt → 2CO2 + PtWhat is the catalyst? a. heat b. CO c. O2 d. Pt e. CO2 f. no correct responsearrow_forward
- The molecules present in a compound must be a. heteroatomic b. triatomic c. diatomic d. no correct responsearrow_forwardWhich of the following statements is true for all balanced equations? * The total number of compounds on each side must be equal. The sum of the subscripts on each side must be equal. The sum of the coefficients on each side must be equal. O No correct response.arrow_forwardThe defining equation for the molarity concentration unit is a. moles solute/mL solution b. moles solute/L solution c. grams solute/L solution d. no correct responsearrow_forward
- What is the percent by volume (% v/v) of ethanol in a solution prepared by adding enough water to 75.0 mL of ethanol to make 350.0 mL of ethanol solution? Report your result in decimal notation and to the proper number of significant figures. All numbers are measured. a) 7.50% b) 21.4% c) 75.0% d) 27.3% e) no correct responsearrow_forwardA solution is prepared by mixing 25.0 mL of 0.34 M NH3 (pkp=4.74) and 21.0 mL of 0.95 M HCN (pKa-9.21). What is concentration of HCN at equilibrlum gven the reaction below? NH3 (aq) + HCN (aq) NH4 (aq) + CN (aq) Numeric Responsearrow_forward30. Which of the following would decrease the number of effective collisions/minute during a reaction? a. decreasing reactant concentration b. increasing reactant concentration c. increasing reactant temperature d. no correct responsearrow_forward
- General, Organic, and Biological ChemistryChemistryISBN:9781285853918Author:H. Stephen StokerPublisher:Cengage Learning