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Rebekah
How many moles of hydrogen gas are produced, given the mass of Mg and the balanced chemical equation?
The mass of magnesium is 0.0479 g
The balanced chemical equation is:
2Mg (s) + 2HCl -> H2 (g) + 2MgCl (aq)
1 AnswerChemistry4 years agoIf the solution has the same density and specific heat as water, what is ΔH for this reaction (per mole of H2O produced)?
In a constant-pressure calorimeter, 65.0 mL of 0.330 M Ba(OH)2 was added to 65.0 mL of 0.660 M HCl.
The reaction caused the temperature of the solution to rise from 23.77 °C to 28.27 °C.
If the solution has the same density and specific heat as water (1.00 g/mL and 4.184 J/g·°C, respectively), what is ΔH for this reaction (per mole of H2O produced)?
Assume that the total volume is the sum of the individual volumes.
1 AnswerChemistry4 years ago
What is the current generated from the 4V battery (using KVL to solve)?
Thank you for helping!! As I work through these and verify the answers, I'm feeling more confident about being able to work these problems on the exam.
a) Use KVL method to find out current generated from 4V battery
b) Find out current passing resistor R3
c) Find out current passing resistor R1
d) Find out voltage at location “A”
e) What is power generated by 1V battery?
1 AnswerEngineering4 years ago
Using Ohm's Law and simplification of the circuit, what are the resistor, power, current, and voltage values?
This is part of a study guide for a test. For some reason, solutions aren't included in study guide/textbook examples. Without answers, I have no idea if I'm solving them right or will be going in to the exam with notes full of wrong circuit analyses.
I appreciate the help immensely!
I'm confident with simplifying the circuit, so I'm pasting just the other questions:
b) What is the total current comes out of 3V battery?
c) What is Power delivered by Battery?
d) What is the current passing through resistor R1?
e) What is voltage at location E?
f) If you know current passing R1, and voltage at E. What is voltage at location A? (2 points)
g) Once you know voltage at location A and location C, what is current passing through R2?
h) How much power dissipated on R2?
i) What’s the current passing through resistor R4 and R3?
j) What is voltage of location B?
k) What is voltage of location D?
l) What if power supply is not 3V battery, but rather 0.1 amp current source, what is the voltage at
location E ?
2 AnswersEngineering4 years ago
What is the voltage across the resistors, the current passing through, power/heat dissipated, and the power generated by the battery?
This is part of a study guide for a test. For some reason, solutions aren't included in study guide/textbook examples. Without answers, I have no idea if I'm solving them right or will be going in to the exam with notes full of wrong circuit analyses.
I appreciate the help immensely!
a) What is the voltage across R1?
b) What is current passing through R1?
c) What is current passing through R2?
d) What is voltage across R2
e) What is the value of Resistor R2?
f) What is Power Generated by 3V battery?
g) What is Power / Heat dissipated on R1?
h) What is Power / Heat dissipated on R2?
i) Is this an ideal circuit? Why?
4 AnswersEngineering4 years agoWhat is a good way to remember the variations of Ideal Gas Law?
2 AnswersPhysics4 years agoCalculate the pressure of a gas at 291 K if the concentration is 0.150 mol/L?
I'm not sure which formula to use, so the formula is the most helpful part of the answer. Thanks!
1 AnswerChemistry4 years agoWhat is the new volume of a balloon, and how many moles of air does it contain?
If the balloon contains 4.0 L of air, internal pressure is 1.25 atm, and temp is 21.2 degrees Celsius and is carried down to the bottom of a lake (ignore the unlikelihood of that) where the pressure is 5.95 atm and temp is 10.9 degrees Celsius?
I understand that when pressure increases then volume decreases. I don't understand how the number of moles would change - seems like that should stay the same, just while occupying less space?
1 AnswerChemistry4 years agoA 1.5 L sample of CCl2F2 (g) is held at 56 torr and 23.5 degrees Celsius.?
If the pressure is increased to 150 torr (temp stays the same), what is the new volume of gas?
In the above system, how many grams of CCl2F2 are in the system?
I figured that the new volume of gas is 0.9 L but since the system changes in pressure, I'm not sure how to solve the second question of the problem.
2 AnswersChemistry4 years agoWhat is "the sum of 10 divided by a number and that number divided by 10"?
I need to write this as an algebraic expression (with x representing "a number"):
the sum of 10 divided by a number and that number divided by 10
I get 10/x for "10 divided by a number".
I assume "that number" is the solution to 10/x
It seems to me that there are 2 variables ("a number" and "that number") but the instructions indicate using only one variable (x).
The instructions are: Write each English phrase as an algebraic expression. Let the variable x represent the number.
If you can explain how you came up with your answer, I'll appreciate it! I'm trying to understand how to do this so I can do similar problems correctly.
Thanks!
6 AnswersMathematics8 years agoSchwimmbad or Schwimmbecken (German)?
I just read a short lesson on LingQ and both Schwimmbad and Schwimmbecken were used, it seems, to mean "swimming pool". I'm wondering if there is a reason one was used rather than the other. Can these words be used interchangeably?
3 AnswersLanguages9 years ago
