Answer:
6.6253*10²¹molecules of ethane (C₂H₆) are present in 0.334 g of C₂H₆
Explanation:
Avogadro's Number is the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of that substance. Its value is 6.023 * 10²³ particles per mole. Avogadro's number applies to any substance.
In this case, being:
the molar mass of ethane C₂H₆ is:
C₂H₆: 2*12 g/mole + 6* 1 g/mole= 30 g/mole
Then you can apply the following rule of three: if 30 grams of C₂H₆ are present in 1 mole, 0.334 grams of C₂H₆ in how many moles are present?
moles of C₂H₆=0.011
Finally, taking into account the definition of Avogadro's number, you can apply the following rule of three: if there are 6.023 * 10²³ molecules of C₂H₆ in 1 mole, how many molecules are there in 0.011 moles?
molecules of C₂H₆= 6.6253*10²¹
<u><em>6.6253*10²¹molecules of ethane (C₂H₆) are present in 0.334 g of C₂H₆</em></u>
Answer:
NaOH is not suitable for use as a primary standard because they readily absorb moisture, H2O, from the atmosphere.
Explanation:
They readily absorb carbon dioxide from the atmosphere.
Answer:
Light receptors within the eye transmit messages to the brain, which produces the familiar sensations of color. Newton observed that color is not inherent in objects. Rather, the surface of an object reflects some colors and absorbs all the others. We perceive only the reflected colors.
Answer:
i would say the last one Heat energy from below the ground converts water to steam to drive a steam turbine attached to an electrical generator
Explanation: