The answer is c) 25 because the mass number is the # of protons and neutrons in the nucleus, therefor, 12 + 13 = 25
1 mole of butane uses 4.5 moles of oxygen
0.1 mole of butane will use = 0.1 * 4.5 = 0.45 moles
P = 100 kPa = 100,000Pa
n = 0.45
T = 295 K
V = ?
Using PV = nRT
⇒ 100,000 * V = 0.45 * 8.314 * 295
⇒100,000 V = 1103.68
⇒ V = 1103.68/100,000 m³
⇒ V = 1103.68/100,000 * 1000 dm³
⇒ V = 11.036 dm³
You need 11.036 dm³ oxygen.
Let's imagine that we were going to start a company that produces
spectroscopes to sell to general chemistry students. To ensure that all the
spectroscopes created the same calibration line and equation we need to be sure it was always the same we should compare all these with the same standard spectroscope while manufacturing
hope this helps
Alchemists attempted to purify, mature, and perfect certain materials. ... Islamic and European alchemists developed a structure of basic laboratory techniques, theory, terminology, and experimental method, some of which are still in use today.
Respiration. That is the process.