Answer:
must usExplanation:This question refers to the study of gases. To solve it, initially we e the following expression:
P × V = n × R × T
where P is the pressure (Pa), V is the volume (m³), n is the number of moles in the sample, R is the universal gas constant and T is the temperature (K). Transforming the units according to the equation, we have:
P = 2 × 10 ^ 5 Pa
V = 8/1000 = 0.008 m³
T = 27 + 273 = 300 K
Substituting in the equation, we have:
2 × 10 ^ 5 × 0.008 = n × 8.0 × 300
n = 0.667 moles
Finally, we use the following expression, which relates number of moles and sample mass:
m = M × n
where m is the mass (g) and M is the molar mass (g / mol). Thus, the mass of this gas is:
m = 28 × 0.667
m = 18.67 g
Answer: A speech
Explanation:
It's a speech because it involves a prepared message an audience and a message for them to decode, it could be on any subject matter, the subject matter is to be understood, that is the purpose to be achieved
Hi, The correct answer here is D.
