214 Answered Questions for the topic College Chemistry
College Chemistry
06/08/19
A stock solution of HNO3 is prepared and found to contain 12.0 M of HNO3.
If 25.0 mL of the stock solution is diluted to a final volume of 0.500 L, the concentration of the diluted solution is ________ M.
1.67
240
0.600
600
0.240
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College Chemistry Chemistry
04/08/19
Chemistry Question
Consider the neutralization reaction 2HNO3 (aq)+Ba(OH)2 (aq)------>2H2O(l)+Ba(NO3)2(aq). A 0.115-L sample of an unknown HNO3 solution required 41.9 mL of 0.150 M Ba(OH)2 for complete...
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College Chemistry
04/05/19
What is the enthalpy of the reaction as written?
When 0.690 g of sodium metal is added to an excess of hydrochloric acid, 7170 J of heat are produced. What is the enthalpy of the reaction as written?
College Chemistry Chemistry
04/05/19
How may calories are there per gram of candy?
A researcher studying the nutritional value of a new candy places a 5.20 g sample of the candy inside a bomb calorimeter and combusts it in excess oxygen. The observed temperature increase is ...
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11/18/18
Calculate the boiling point of a 8.25 m aqueous solution of ethanol.
I originally attempted to solve this problem (as shown below), but it is not right. How can I correctly calculate the boiling point?My attempt:The normal boiling point for ethanol is 78.4° C and...
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09/30/18
Chemistry homework help
Write a balanced metathesis equation for the reaction which takes place when the two solutions described below are combined and then determine the amount of solid product produced. 250.0 ml of...
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09/12/18
What would be the osmotic pressure of 500. ml of a 0.100 M K3PO4 solution
the problem doesn’t provide temperature, should i use 273k?
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College Chemistry
08/30/18
How many dg (decigrams) are in 8270kg?
the answer needs to be in scientific notation.
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College Chemistry
08/30/18
Calcium 44 emits a beta particle, what element results?
Need to show the equation to solve this proble.
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College Chemistry
08/30/18
Nobelium 102 emits a ganna Ray,what element results
Need to show the equation used to figu this problem out.
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College Chemistry
08/29/18
Blackberries cost $0.0812/g how much does 1.0oz cost in cents?
2.2lb=1kg;16oz=1lb
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College Chemistry
08/29/18
How do I solve 32.874+107.1?
The answer needs to be in the correct significant figure.
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College Chemistry
08/28/18
A slice of pizza contains 33.2g of carbohydrates,18.5g if fat and 4.0 of protein. How many kilocalories dose a slice have?
What is the formula needed to solve this
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College Chemistry
08/28/18
It’s-28 Fahrenheit outside,what is that in Celsius and Kelvin?
What is the equation I need to solve this?
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College Chemistry
08/28/18
The density an object is 3.84gr/ml,you have 332gr of it what is the volume of this sample
I need to know the volume of the object
08/23/18
Carry out the following operations and express the answer with the appropriate number of significant figures: [(285.3x10^5)-(1.200x10^3)]x2.8954
How do I solve this problem with the scientific notation? And when it comes to the rules of significant figures, do I use the rule pertaining to subtraction or the one pertaining to...
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07/26/18
Chemistry chemical reaction rate questions
For the reaction 4NH3 + 7O2 --> 4NO2 + 6H2O.
a.) Provide a valid expression for the reaction rate
b.) How is the rate at which O2 disappears related to the rate at which NO2 appears in...
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07/26/18
Chemistry 2 rate of reaction homework help
The decomposition of nitramide, NH2NO, is a first-order reaction.
a.) Write the rate law formula.
b.) When starting with 0.105 M NH2NO2, with rate constant k = 5.2 x 10^-2 s^-1 at 15Celsius,...
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07/20/18
Question about how significant digits work in chemistry.
I'm doing my online chemistry summer class and significant digits are included, of course. But I'm confused about them because everything I believe is being contradicted. Here's what I...
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College Chemistry
02/27/18
amount of heat needed to melt 45.9 g of solid ethanol and bring it to a temperature of -37.4 degrees celsius
Calculate the amount of heat needed to melt 45.9 g of solid ethanol and bring it to a temperature of -37.4 degrees celsius. Round your answer to 3 significant digits. Also, be sure your answer...
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11/28/17
Chemistry Homework
Write the cell notation for an electrochemical cell consisting of an anode where Cr2+(aq) is oxidized to Cr3+(aq) at a platinum electrode and a cathode where Fe3+(aq) is reduced to Fe2+(aq) at a...
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11/15/17
what is the empirical formula?
the compound xylene consists of 90.49% C and the rest is hydrogen.What is the empirical formula?
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11/14/17
determine the mass of the sample
1.48 mol carbon tetrafluoride
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10/23/17
What is the volume of a rock with density 3.68 and mass of 430 g?
What is the volume of a rock with a density of 3.68 g/cm3 and a mass of 430 g?
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