11/19/19

When 45.8 g C3H8 reacts with 215 g O2, how many grams of CO2 can be made?
A. 137B. 59.1C. 45.7D. 177
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11/19/19

Help can someone check my work
Draw the condensed formulas of 3-hexene and 2-methylbutane3-hexeneCH3CH2CH=CHCH2CH32-methylbutaneCH3|CH3-CH-CH2-CH3 Draw the structural formula of 3-pentyne. What is wrong with this... more
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11/19/19

Solving Limiting Reactant problems in solution

Suppose  0.0187g of sodium iodide is dissolved in 50.mL of a 22.0mM aqueous solution of silver nitrate.Calculate the final molarity of sodium cation in the solution. You can assume the volume of... more
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11/19/19

45.0 g of ice at –10.0 C is mixed with 325 g of water at 37.0 C. Calculate the final temperature of the mixture.
45.0 g of ice at –10.0 C is mixed with 325 g of water at 37.0 C. Calculate the final temperature of the mixture. Assume that no energy in the form of heat is transferred to the environment. (Heat... more
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11/18/19

How much heat is required fo change 28g of ice at -9.00 C to 28g of steam at 131 C
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11/18/19

If you needed to generate 66mL of H2 gas at STP, how many grams of Na would be required?

Given: 2 Na+ 2 H2O —> 2 NaOH + H2
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11/18/19

How many carbon atoms are in this sample?
Consider a sample of 10.0 g of the gaseous hydrocarbon C2H6 to answer the following question: How many carbon atoms are present in this 10.0 g sample?how many significant figures are there?
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11/18/19

What volume (in mL) of 4.46 M HCl is required to fully react with 19.3 mL of 2.13 M Ca(OH)2?
Consider the following balanced equation.2HCl (aq) + Ca(OH)2 (aq)  2H2O (l) + CaCl2 (aq)
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11/18/19

Calculate the amount of heat absorbed (in kJ) when 35.15 g of CO2 reacts.
2Fe3O4 (s) + CO2 (g)  3Fe2O3 (s) + CO (g)     H = 47.2 kJ
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11/18/19

If 1.49 grams of NO react, how many grams of NO2 form?
Consider the following balanced reaction.2H+ (aq) + 2NO3- (aq) + NO (g)  3NO2 (g) + H2O (l)
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11/16/19

In an aqueous solution at 25°C, if [H₃O⁺] = 2.4 × 10⁻⁴ M, then [OH⁻] is:
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11/16/19

The concentration of hydroxide ion in an aqueous solution at 25°C is 3.6 × 10⁻⁴ M. What is the concentration of the hydronium ion?
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11/16/19

Consider the following balanced chemical equation: 2K3PO4 (aq) + 3MgBr2 (aq) ----> Mg3(PO4)2 (s) + 6KBr (aq)

A 97.17 mL sample of 1.4 M K3PO4 is mixed with 45.24 mL of 0.615 M MgBr2. After reaction, what is the concentration of the excess reactant (in M)?
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11/16/19

Consider the following balanced chemical equation: 4Na (s) + O2 (g) ----> 2Na2O (s) . Calculate the volume of O2 gas (in L) needed at STP to react with 89 g Na.
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11/16/19

Can you please help with this? I'm very confused and don't now how to start

If the DNA concentration is 145.5 micrograms/mL afrter the concentration measurement and your PCR requires 10 ng/microliter of DNA for 20 microliters of PCR volume: What is the volume of DNA that... more
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11/15/19

chemistry question
Consider the reaction 3CaCl2(aq) + 2Na3PO4(aq) --> Ca3(PO4)2(s) + 6 NaCl(aq) (molar mass of calcium phosphate is 310.18 g/mol)What volume of 0.500 M Na3PO4 solution is needed to react with 275... more
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11/15/19

chemistry help!!!!!!!!!!!! enthalpy

3.15 mol of an unknown solid is placed into enough water to make 150.0 mL of solution. The solution's temperature increases by 19.21°C. Calculate ∆H for the dissolution of the unknown solid. (The... more
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11/15/19

Raoult's Law Calculations
The vapor pressure of water is 23.76 mm Hg at 25 °C. A nonvolatile, nonelectrolyte that dissolves in water is glucose.Calculate the vapor pressure of the solution at 25 °C when 14.85 grams... more
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11/15/19

Sodium oxalate and Potassium Permanganate reaction stoichiometry
An impure sample of sodium oxalate weighing 1.557 g required 27.59 mL of 0.0978 M potassium permanganate for complete reaction according to the following reaction:5Na2C2O4 + 2KMnO4 + 8H2SO4 =... more
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11/15/19

Calorimetry problem
2.035g of a soluble salt is added to 48.1g of water in a calorimeter. The temperature changes from 26.6 °C to 19.4 °C. Calculate the heat change q of the reservoir in joules. Assume the heat... more
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11/15/19

Calorimetry question
If 51.8 mL of 1.3 M NaOH react with excess HCl creating 2742.3 J of heat, what is the ΔHneutralization in kJ/mol? NaOH(aq) + HCl(aq) → NaCl(aq) + H2O(l)
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11/15/19

Balance the equation in acidic and basic solution.
Balance the following equation in a) acidic solution b) basic solution.MnO2 + H3AsO3 --> Mn 2+ + H3AsO4
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11/15/19

What is the percent yield for this reaction?
The equation below shows the reaction of barium nitrate (Ba(NO3)2) with sodium sulfate (Na2SO4). Assume that 0.45 mol of Ba(NO3)2 reacted with excess Na2SO4 to produce 0.41 mol of BaSO4.Ba(NO3)2 +... more
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11/15/19

How many grams of hydrogen chloride are needed to completely react with 195 grams of zinc?
Zn + 2 HCl —> ZnCl2 + H2Approximately how many grams of hydrogen chloride are needed to completely react with 195 grams of zinc?
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11/15/19

A chemist prepares a solution of iron chloride by measuring out 0.10 g of FeCl2 into a 50. mL volumetric flask and filling to the mark with distilled water.

Calculate the molarity of anions in the chemist's solution.
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