The printing press originated in Germany in the 15th century.
Answer:
luminous under the sand
Explanation:
I got it right on my Assignment :)
Answer:
B. CH₅N
Explanation:
The combustion reaction of a compound CₐHₓNₙ with O₂ is:
CₐHₓNₙ + O₂ → a CO₂ + X/2 H₂O + n NO₂
Where 1 mole of CₐHₓNₙ with an excess of O₂ produce a moles of CO₂, X/2 moles of H₂O and n moles of NO₂
Thus, you need to convert the mass of CO₂ and H₂O to moles to find the C:H ratio and determine a possible empirical formula thus:
Moles CO₂ (Molar mass 44g/mol):
44g ₓ (1mol / 44g) = 1 mole CO₂ = 1 mole C
Mole of H₂O (Molar mass 18g/mol):
45g ₓ (1 mol / 18g) = 2.5 moles H₂O = 5 moles H
Thus, in the compound you have 5 moles of H per mole of C, and a possible empirical formula is:
B. CH₅N
The only structure that meet this C:H ratio
President Reagan’s new approach to the Cold War reveal about his foreign-policy strategy is:
- <u>C. He wanted to work for peace from a position of military strength. </u>
<u />
The Cold War was a period in history between the United States and Russia (then known as the Soviet Union) where there were conflicts which led to trade embargoes, diplomatic issues and threats of war.
The two leaders of America and the Soviet Union respectively, President Reagan and Comrade Gorbachev were engaged in war of words and President Reagan tried to make peace and evoid conflict, even though the United States were stronger from a military perspective
Therefore, the correct answer is option C
Read more here:
brainly.com/question/3571607
