Concept explainers
(a)
Interpretation:
The mass of S atoms in
Concept Introduction:
Molar mass of a substance is the mass in grams of one mole of the substance. Unit of molar mass is g/mol.
Molar mass of
Mass ratio of a compound with formula AB can be determined as follows,
(b)
Interpretation:
The mass of S atoms in
Concept Introduction:
Molar mass of a substance is the mass in grams of one mole of the substance. Unit of molar mass is g/mol.
Molar mass of
Mass ratio of a compound with formula AB can be determined as follows,
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Chemistry In Context
- You have 1.5 moles of tricycles. a How many moles of seals do you have? b How many moles of tires do you have? c How could you use parts a and b as an analogy to teach a friend about the number of moles of OH ions in 1.5 moles of Mg(OH)2?arrow_forwardAmmonium nitrate, NH4NO3, which is prepared from nitric acid, is used as a nitrogen fertilizer. Calculate the mass percentages of the elements in ammonium nitrate (to three significant figures).arrow_forwardSKILL #3 CONVERSIONS WITH MOLE RATIO C,Hale + 50o → 3 CO, (3)8, 2(g) 2(g) + 4 H,0, '2°(g) How many moles of 0, are required to produce 17.8 moles of CO,?arrow_forward
- To WUIK Out reactant. Use the relationship: mass of substance number of moles = mass of 1 mol of substance or volume of gas at s.t.p. number of moles of gas = 22.4 dm3 mol-1 of moles of the unknown, and hence the mass or volume at s.t.p. Worked example 4 On heating, potassium chlorate( omposes into potassium chloride and oxygen: 2KCIO;(s) → 2KCI(s) + 30,(g) 9.8 g of KCIO3(s) are heated. Calculate: a the mass of KCl(s) formed3B b the mass and volume, at s.t.p., of O,(g) formed.arrow_forwardWorked example 3 Determine the mass of oxygen (0,) consumed in the reaction from Worked example 2 on page 205. Step 1 Write a balanced equation 2H,(g) + 0,(g) → 2H,0(g) Step 2 Write down the 2 moles + 1 mole - 2 moles mole'ratio for the equation Step 3 Calculate molar M (O,) = [(2 x 16)] = 32 g.mol M„(H,) = [(1 x 2)] = 2 g.mol m(H,) is 8,00 g, so number of moles of H, is: masses Step 4 Calculate number of moles 8,00 g = 2 g.mol- = 4 moles Step 5 Write down the 2 moles H, reacts with 1 mole O,, therefore: moles in the moles H, reacts with 2 moles O, reaction Mass of O, consumed: m =n x M = 2,00 mol x 32 g.mol- = 64 g 64 g of oxygen is consumed. Step 6 Determine the mass of the product(s) Step 7 Conclusion Activity 1 Perform stoichiometric calculations In the following chemical reaction: 2H,(g) + O,(g) → 2H,O(g) 1.1 How many moles of H,0 will be produced from 6 moles of O,? 1.2 How many moles of H, will'react with 40 g of 0,? 1.3 How many grams of H,O will be produced by 18 g of H,? Zinc…arrow_forwardNitric acid, HNO3, is a colorless, corrosive liquid used in the manufacture of nitrogen fertilizers and explosives. In an experiment to develop new explosives for mining operations, a sample containing 28.5 g of nitric acid was poured into a beaker. How many moles of HNO3 are there in this sample of nitric add?arrow_forward
- A sample of limestone and other soil materials was heated, and the limestone decomposed to give calcium oxide and carbon dioxide. CACO3 (s) Ca0(s) + CO2(g) A 6.748 g sample of limestone-containing material gave 2.63 g of CO2, in addition to CaO, after being heated at a high temperature. What was the mass percent of CACO3 in the original sample? % Submit Answer Try Another Version 10 item attempts remainingarrow_forwardSKILL #3 CONVERSIONS WITH MOLE RATIO GHale + 50, 3 CO. 2(g) + 4 H,0, 2(g) (g) How many moles of C,H, are needed to completely react with 9.15 moles of 0,?arrow_forwardPractice Exercise 2In the following diagram, the white spheres represent hydrogenatoms, the black spheres carbon atoms, and the redspheres oxygen atoms.In this reaction, there are two reactants, ethylene, C2H4,which is shown, and oxygen, O2, which is not shown, andtwo products, CO2 and H2O, both of which are shown.(a) Write a balanced chemical equation for the reaction.(b) Determine the number of O2 molecules that should beshown in the left (reactants) box.arrow_forward
- Practice Exercise 1Sodium hydroxide reacts with carbon dioxide to form sodiumcarbonate and water:2 NaOH1s2 + CO21g2¡Na2CO31s2 + H2O1l2How many grams of Na2CO3 can be prepared from 2.40 g ofNaOH? (a) 3.18 g (b) 6.36 g (c) 1.20 g (d) 0.0300 garrow_forwardCalculate the formula weights of the following compounds, using a table of atomic weights. Give the answers to three significant figures. a. nitrogen dioxide, NO2; b. glucose, C6H12O6; c. sodium hydroxide, NaOH; d. magnesium hydroxide. Mg(OH)2.arrow_forwardBenzoic acid is a white, crystalline powder used as a food preservative. The compound contains 68.8% C, 5.0% H, and 26.2% O, by mass. What is its empirical formula?arrow_forward
- Introductory Chemistry: A FoundationChemistryISBN:9781337399425Author:Steven S. Zumdahl, Donald J. DeCostePublisher:Cengage LearningGeneral Chemistry - Standalone book (MindTap Cour...ChemistryISBN:9781305580343Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; DarrellPublisher:Cengage Learning