I'm pretty sure that significant figures is just the amount of numbers there is. So, in this case I think the answer would be D. 5
Answer:
34.08g
Explanation:
(Take the atomic mass of N=14.0, H=1.0)
no. of moles = mass / molar mass
no. of moles of N2 used = 28.02 / (14x2)
= 1 mol
Since H2 is in excess and N2 is the limiting reagent, the no. of moles of NH3 produced depends on the no. of moles of N2 used.
From the equation, the mole ratio of N2:NH3 = 1: 2,
which means one mole of N2 produces 2 moles of NH3.
From the ratio, we can deduce the no. of moles of NH3 produced = 1 x 2 =2moles.
Mass = no. of moles x molar mass
Mass of NH3 produced = 2 x (14.0+1.0x3)
= 34g
≈34.08g (this happens because the atomic mass I took is only corrected to 1 decimal place, but in the end, this is only a very small error in the decimals. Make sure you take a look if the question provides the atomic mass:) )
PV = nRT
n = PV/RT
n = (2)(3)/(.0821)(273*25)
n = 6/24.466 = 0.245
Answer:
a disturbance that forms new land without soil
Explanation:
- Pioneer species move into an area after a disturbance that forms new land without soil.
- Pioneer species are the first organisms to colonize an area that has undergone primary succession. These species must be hardy and strong, they include mosses or lichens, fungi and bacteria.
- Primary succession occurs when in a lifeless area or areas in which the soil is not capable of sustaining life. This results from factors such as volcanic eruptions, retreating glacier and also sand dunes.
- Pioneer species are capable of living in harsh environment conditions where other species can not survive.
Answer:
15 (Fifteen) trigonal planar carbon atoms.
Explanation:
Geometry around Carbon atom is basically controlled by the type of hybridization it follows. Carbon atom gives three types of hybridizations as;
Sp³ Hybridization:
In this type carbon atom is involved in making four single bonds with other atoms. Hence, the geometry about sp³ hybridized Carbon is tetrahedral.
Sp² Hybridization:
In this type carbon atom is involved in making two single bonds and one double bond with other atoms. Hence, the geometry about sp² hybridized Carbon is trigonal planar.
Sp Hybridization:
In this type carbon atom is involved in making one single bond and one triple bond with other atoms. Hence, the geometry about sp hybridized Carbon is linear.
Result:
In the structure of Metaxanthene there are 15 carbons (highlighted red) which are sp² hybridized. Therefore, there are 15 trigonal planar carbons in Metaxanthene.
