Part A
When designing a science presentation, look for credible sources. Science doesn't
show bias, but humans do. Avoid sites and articles that provide facts without citing
proper scientific evidence. You must be able to identify reliable sites so the data in
your presentation is credible.
Use sources with URLs that end in.gov, such as CDC.gov. Government sites are
reliable sources. You can also use sites with URLs ending in .edu. They are usually
trustworthy, but sometimes students, rather than scientists, write content for.edu
websites. Always identify the author of the source before proceeding. Some .org and
.com sites are credible, but it's important to verify their authenticity. When reviewing a
source, ask these questions:
Who is the author?
• Is this person a chemistry expert?
. What is the document's purpose?
• Does the document state facts that scientists can support with evidence?
• Are there opinions in the document?
• How old is the document?
• Do other credible sources support the statements in the document?
Search for credible websites or publications on the Haber process and its inventors.
Write down at least two sources you will use for your presentation, and cite them
using Modern Language Association (MLA) citation methods C.
Solved
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Ответ:
239.7mL
Explanation:
Using the general gas equation;
PV = nRT
Where;
P = pressure (atm)
V = volume (L)
n = number of moles (mol)
R = gas constant (0.0821 Latm/molK)
T = temperature (K)
The balanced chemical equation in this question is as follows:
CaC2(s) + 2H2O(l) --> Ca(OH)2(aq) + C2H2(g)
From the equation, 1 mole of CaC2 produces 1 mole of ethylene gas, C2H2.
Using mole = mass/molar mass
Molar mass of CaC2 = 40 + 12(2)
= 40 + 24
= 64g/mol
mole = 0.5487/64
mole = 0.00857mol of CaC2
Hence, 0.00857mol of CaC2 produced 0.00857mol of C2H2
Based on the information provided, n = 0.00857mol, T = 43°C = 43 + 273 = 316K, p = 0.926 atm
PV = nRT
V = nRT/P
V = 0.00857 × 0.0821 × 316/0.926
V = 0.222/0.926
V = 0.2397L
In mL, volume = 0.2397 × 1000
= 239.7mL