16. a. 125 mL b. 250 mL c. 500mL d. 2000mL e. 1000mL Can someone please help me

Question

16. a. 125 mL b. 250 mL c. 500mL d. 2000mL e. 1000mL

Can someone please help me with my chemistry test review? I need the answers.

What are the stoichiometric coefficients for oxygen and water, respectively, in the balanced chemical reaction equation representing the combustion of butane (C_4H_10)? 4, 5 9, 5 13, 10 9/2, 10 13, 5 If the combustion of fossil fuels adds about 5 times 10^12 kg of carbon to the atmosphere as Co_2 each year, how much oxygen is required to produce this amount of carbon dioxide? about 1.3 times 10^12 kg about 1.3 times 10^13 kg about 2.6 times 10^12 kg about 2.6 times 10^13 kg about 6.7 times 10^12 kg An iron ore, magnetite, contains only iron and oxygen. In refining 100.0 g of the ore, 72.35 g of iron are obtained. What is the empirical formula of the ore? Fe_2O_3 FeO_2 Fe_O_5 Fe_3O_4 FeO Caffeine has an elemental analysis of 49.48% carbon, 5.190% hydrogen, 16.47% oxygen, and 28.85% nitrogen. It has a molar mass of 194.19 g/mol. What is the molecular formula of caffeine? C_4H_5N_2O C_8H_10N_4O_2 C_10H_14N_2O_2 C_6H_6NO_2 C_5H_7NO A hydrocarbon molecule contains carbon and hydrogen atoms in equal numbers. Its molar mass is 130.18 g mol. What is the molecular formula for the hydrocarbon? C_7H_7 C_12H_12 C_8H_8 C_10H_10 CH A homogeneous mixture of two or more substances is called _______ a compound. an electrolyte. a solution. a solvent. a mess. Molarity, M, is defined as _______ moles of solute dissolved in 1 mol of solvent. moles of solute dissolved in 1 kg of solvent. moles of solute dissolved in 1 L of solvent. moles of solute dissolved in 1 L of solution. moles of solute dissolved in the solution. How many grams of solid magnesium chloride, MgCl_2, are needed to make 250 mL of 0.50 M solution? 9.5 g 48 g 12 g 125 g 4.8 g What volume of 12 M HCl solution needs to be diluted to produce 500 mL of 3.0 M HCl solution?

Explanation / Answer

8)

C4H10 + O2   —> CO2 + H2O

balance C:

C4H10 + O2   —> 4CO2 + H2O

balance H:

C4H10 + O2   —> 4CO2 + 5H2O

balance O:

C4H10 + (13/2)O2   —> 4CO2 + 5H2O

multiply throughout by 2

2C4H10 + 13O2   —> 8CO2 + 10H2O

coefficient for O2 = 13

coefficient for H2O = 10

Answer: c

i am allowed to answer only 1 question at a time

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