10/14/20

Reactions? One question.
A chemist measures the energy change ΔH during the following reaction:CH4(g) + 2O2(g) --> CO2(g) + 2H2O(l) DeltaH: -882. kJUse the information to answer the following questions. Is the... more
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10/14/20

In the redox reaction below, identify which reactant is oxidized and which is reduced.
2Fe2O3(s) + 3C (s) 🡪 3CO2(g) + 4Fe (s) Oxidized: _____________ Reduced: ______________
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10/14/20

How many atoms of oxygen are present in 6.50 grams of KClO4
 How many atoms of oxygen are present in 6.50 grams of KClO4
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10/14/20

To solve chemistry questions

How many moles of propane would be required to produce 540g of carbon dioxide?C3H8 (g) + 5O2 (g)⟶⟶⟶⟶  3CO2 (g)+ 4H2O (l)The molar masses of C, H and O are 12, 1, and 16 g/mol respectivelyGroup of... more
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10/13/20

What is the electron configuration for Gallium?
Google results show: 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p1or [Ar] 3d10 4s2 4p1However, when based on the electron configuration diagram and the periodic table, doesn't 4s come before 3d? Shouldn't it... more
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10/12/20

Can a quantum particle confined in a one-dimensional box in the n = 1 state release (give off) energy.
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10/12/20

Mean bond enthalpies: C=C 612kJ/mol, C-C 348 kJ/mol, C-HkJ/mol, H-H 436kJ/mol, C(s) —> C(g) 715kJ/mol

Mean bond enthalpies: C=C 612kJ/mol, C-C 348 kJ/mol, C-HkJ/mol, H-H 436kJ/mol, C(s) —> C(g) 715kJ/mol1 - Calculate the enthalpy change for the dimerisation of ethene to give cyclobutane2 C2H4(g)... more
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10/12/20

What mass of KCl is needed to prepare a 100mL with a concentration of 1.00 x 10^-3mol.L^-1?
The question is in the title, and the answer is asking for Mass in grams, im not exactly sure how to do it. Please help!
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10/12/20

The Average mass
What is the average mass of a single argon in gram
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10/11/20

How many mL of stomach acid would be neutralized by the antacid?
If 1.95 x 10-3 mols of stomach acid is neutralized by the antacid, and the concentration of stomach acid is 0.155 M, how many mL of stomach acid would be neutralized by the antacid?a. 13.4 mLb.... more
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10/11/20

In what case does a polyatomic ion lose one oxygen? (-ite atoms)
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10/11/20

Determine the mass in grams of 5.02 × 10²¹ atoms of barium. (The mass of one mole of barium is 137.33 g.)
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10/11/20

The question is in the description.
The standard enthalpy of formation of H2O (l) is -286 kJ/mol and the standard enthalpy of combustion of ethane is -1560 kJ/mol. Given that the enthalpy change when one mole of ethene is redcued by... more
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10/11/20

A calormeter has a mass of 200g and a specific heat capacity of 0.420 J g-¹. Into it are put 50.0 cm³ of 1.25 mol dm-³ hydrochloric acid and 50.0cm³ of 1.25 mol dm-³ potassium hydroxide solution at...
A calormeter has a mass of 200g and a specific heat capacity of 0.420 J g-¹. Into it are put 50.0 cm³ of 1.25 mol dm-³ hydrochloric acid and 50.0cm³ of 1.25 mol dm-³ potassium hydroxide solution at... more
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10/11/20

The standard enthalpy of formation of H2O (l) is -286 kJ/mol and the standard enthalpy of combustion of ethane is -1560 kJ/mol. Given that the enthalpy change when one mole of...
The standard enthalpy of formation of H2O (l) is -286 kJ/mol and the standard enthalpy of combustion of ethane is -1560 kJ/mol. Given that the enthalpy change when one mole of ethene is redcued by... more
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10/11/20

pleases slove it
A 200. mL of 0.862 M  HCl is mixed with 200. mL of 0.431 M  Ba(OH)2 in a constant pressure coffee cup calorimeter. The initial temperature of the HCl and Ba(OH)2 solutions is the same at 24.48°C.... more
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10/11/20

How do I saw this problem
0.700 moles of an unknown solid is placed into water to make 150.0 mL of solution. The solutions temperature decreases by 6.21 Celsius calculate heat change for the dissolution of the unknown... more
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10/11/20

How do I solve this problem
When 1.956 g of sucrose ( molar mass 342.3 g/mole) is burned in a bomb calorimeter, the temperature of the calorimeter increases From 22.41 Celsius to 26.63 Celsius. If the heat capacity of the... more
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10/11/20

How do I solve this problem

If 1201 J of heat is available, what is the mass in grams of iron( specific heat = 0.45 J/g C) the can be heated from 22.5 Celsius to 120.0 Celsius
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10/10/20

Is work (w) being done on the gas or by the gas in the cylinder? Will the sign of work be >0 or <0?
Consider a gas enclosed in a cylinder with a piston. If the gas is compressed by lowering the piston, is work (w) being done on the gas or by the gas in the cylinder? Will the sign of work be >0... more
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10/10/20

Calculate the change in internal energy, ΔU, for a system that does 422 J of work and loses 227 J of energy as heat
Calculate the change in internal energy, ΔU, for a system that does 422 J of work and loses 227 J of energy as heat.
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10/10/20

Calculate the equilibrium temperature of the coffee.
14.0g of cream at 11.5°C are added to an insulated cup containing 150.0g of coffee at 84.6°C. Calculate the equilibrium temperature of the coffee.You may assume no heat is lost to the cup or... more
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10/10/20

Express your answer with the appropriate units.
Find the number of moles of water that can be formed if you have 158  of hydrogen gas and 74  of oxygen gas.
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10/10/20

When solid lead(II) sulfide ore burns in oxygen gas, the products are solid lead(II) oxide and sulfur dioxide gas.
When solid lead(II) sulfide ore burns in oxygen gas, the products are solid lead(II) oxide and sulfur dioxide gas.How many grams of oxygen are required to react with 22.0 g of lead(II) sulfide?How... more
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10/10/20

2HNO3(aq)+Ba(OH)2(aq)⟶2H2O(l)+Ba(NO3)2(aq)A 0.115 L sample of an unknown HNO3 solution required 31.7 mL of 0.200 M Ba(OH)2 for complete neutralization. What is the concentration of the HNO3 solution?
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