[17]. Trimix 10/50 is a gas mixture that contains 10% oxygen and 50% helium, and the rest is nitrogen. If a tank of Trinix 10/50 has a total pressure of 2.07 x 10^4 kPa, then what is the partial pressure of nitrogen? a). 1.04 x 10^4 kPa
x b). 8.3 x 10^3 kPa
c). 2.07 x 10^3 kPa
d). 2.07 x 10^4 kPa

Answers

Answer 1

Answer: The answer is B. 8.3x10^3 kPa. The partial pressure of a specific gas in a gas mixture is equivalent to product of its mole fraction and total pressure of the mixture. Since it was stated that the mixture is 10% oxygen, 50% helium, and the rest nitrogen, it can be determined that nitrogen is 40% of the mixture. So 40% of 2.07x10^4 kPa is 8.3x10^3 kPa.

Answer 2

Answer:

Answer:

A) 1.04 x 10^4 kPa

Explanation:

I'm not exactly sure how but I took the test and this was the correct answer. My calculations said it was B as well but I guess not...

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What is the total number of moles of solute in 250 milliliters of a 1.0 M solution of NaCl

Answers

First, the Molarity equation is M = mol/L. However, the problem is looking for the TOTAL NUMBER OF MOLES in which will have you to reposition the said equation: mol = M/L. Observe that you need L not mL, so you need to convert 250 mL to L that will results to .25 L. Then, substitute the value of the units to the formula and you should be able to get 4 moles.

Answer:

0.25

Explanation:

Andy is waiting at the signal. As soon as the light turns green, he accelerates his car at a uniform rate of 8.00 meters/second2. What is the displacement of Andy’s car after 30.0 seconds?A.
1200 meters
B.
2400 meters
C.
3600 meters
D.
4800 meters
E.
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Answers

The answer is B
8m/s
Your going to multiply 8 and 30 together which gives you 240.

Which base is the strongest for the given [H+]? 10-9 10-11 10-10 10-12

Answers

Answer:The strongest base with $H^+]$ concentration is $[H^+]=10^(-12) M$ .

Explanation:

$pH=-\log[H^+]$

Higher the pH value less will be the concentration of $[H^+]$ ion concentration and stronger will be the base.

1. $[H^+]=10^(-9) M$

$pH=-\log[10^(-9)]=9$

2. $[H^+]=10^(-11) M$

$pH=-\log[10^(-11)]=11$

3. $[H^+]=10^(-10) M$

$pH=-\log[10^(-10)]=10$

4. $[H^+]=10^(-12) M$

$pH=-\log[10^(-12)]=12$

The strongest base with $H^+$ concentration is $[H^+]=10^(-12) M$ .

The answer is 10-12. The relationship of pH and [H+] is pH = -lg[H+]. And the higher pH, the stronger base is. So the strongest base has the lowest concentration of H+.

What moves in or out of a substance during a change of state?

Answers

Heat, which is energy, moves in or out of a substance during a change of state.

Hanna hypothesizes that granite is denser than sandstone. How can Hanna test her hypothesis?

Answers

To test if the hypothesis is correct, a good way is to think of it this way:
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Calculate the mass and volume of each and do the equation; this will test your hypothesis.
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Which of the following is the best example of heat being. Transferred by conduction