Answer:
The principle component of organic molecules is carbon. Carbon atoms are able to bond with each other to form bigger and bigger structures. In addition, organic compounds frequently contain hydrogen, oxygen and nitrogen; phosphorus and sulfur are occasionally seen as well.
Explanation:
Answer:
139 g of CaH₂ were needed in the reaction
Explanation:
Determine the reaction:
CaH₂ + 2H₂O → Ca(OH)₂ + 2H₂
1 mol of calcium hidride reacts with 2 moles of water to produce 1 mol of calcium hydroxide and 2 moles of hydrogen
Let's determine the moles of formed hydrogen by the Ideal Gases Law
P . V = n . R . T
P = 823 Torr . 1 atm/760 Torr = 1.08 atm
T = Absolute T° → T°C + 273 → 21°C + 273 = 294K
1.08 atm . 147 L = n . 0.082 . 294K
(1.08 atm . 147 L) / (0.082 . 294K) = n → 6.60 moles
Ratio is 2:1. We make a rule of three:
2 moles of H₂ came from 1 mol of hydride
Then 6.60 moles of H₂ must came from 3.30 moles of hydride (6.60 .1) /2
Let's convert the moles to mass → 3.30 mol . 42.08 g/ 1 mol =
138.8 g ≅ 139 g
It may seem remarkable that we can learn about the composition of distant stars by studying the light they emit. In fact, we can learn a great deal, not only about the chemical elements present, but also about physical conditions. The key is to spread the light out by color, producing a spectrum like the one shown in Fig. 1. This lab explores some of the basic ideas used to analyze spectra.
Magnesium(?)
<span>2 HCl + Mg ? MgCl2 + H2</span>