3 years ago

PLEASE HELP!! DUE IN 5 MINUTES!!!’n

Chemistry

1 answer:

Ipatiy [6.2K]3 years ago

7 0

Answer:

I think the answer is 43. good luck :)

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How would oxygen be represented in the formula equation for the reaction of methane and oxygen to yield carbon dioxide and water

Lera25 [3.4K]

Answer:

CH4(g) + 2O2(g) → CO2(g) + 2H2O(g)

Explanation:

CH4(g) + 2O2(g) → CO2(g) + 2H2O(g)

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The balanced equation above shows the combustion of methane, CH4 in oxygen, O2 to yield carbon dioxide, CO2 and steam, H2O.

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3 years ago

hydrogen is found primarily as two isotopes in nature: (1.0078u) and (2.0140u). Caluclate the percentage abundance of each isoto

kotegsom [21]

hydrogens average atomic mass = 1,01u

x = isotope about mass (1.0078u)
y = isotope about mass (2.0140u)

x + y = 100%
so:
x = 100% - y

 $hydrogens ~average~atomic~mass=\frac{(1.0078\cdot x)+(2.0140\cdot y)}{100}\\
1.01=\frac{(1.0078\cdot (100-y))+(2.0140y)}{100}||\cdot 100\\
101=100.78-1.0078y+2.0140\\
101-100.78=1.0062y\\
0,22=1.0062y||:1.0062\\
0.219\%=y\\\\
x=100\%-y\\
x=100\%-0.219\%\\
x=99.781\%\\\\
$

answer:
 $x=99.781\%\\
y=0.219\%$

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3 years ago

Does the Atomic Mass tell you how many protons are in an element or does the Atomic Number tell you how many protons are in an e

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The answer is Atomic Number. I hope this helps. :)

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