1)
0.002342998 2.34299e-3
0.0000471772 4.717e-5
15485552 1.54856e7
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No marks will be shown for this question. What is the name
...
1)
0.002342998 2.34299e-3
0.0000471772 4.717e-5
15485552 1.54856e7
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No marks will be shown for this question. What is the name of each of the following
elements? Watch your spelling.
Hg Mercury
K Potassium
Pb Lead
Mn Magnesium
F Fluorine
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What is the symbol of each of the following elements? The answers are case sensitive.
copper Cu
Cu
carbon C
C
Sr
lead Pb
Pb
silicon Si
Si
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How many moles and grams of carbon are present in 11.2 g of aspirin, C9H8O4. Use the
following atomic masses: C=12, H=1, O=16
0.6675
0.56
mol C
6.720
6.72
g C
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A sample of N2O5 contains 2.56 moles of nitrogen. Use the following atomic masses: N =14,
O=16.
The number of
moles of
N2O5 present =
1.3317
1.28
mol N2O5
The mass of the
sample =
143.8390
138.2
g N2O5
moles of oxygen
in the sample =
6.6585
6.4
mol O
The mass of
oxygen in the
sample =
106.536
102.4
g O
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No marks will be shown for this question.
Balance the following equation using the smallest integer coefficients. If the coefficient is
"1", please input a 1.
a) 1 H3PO4 + 3 KOH 1 K3PO4 + 3 H2O
b) 1 N2O5 + 1 H2O 2 HNO3
c) 2 Al + 6 H2O 2 Al(OH)3 + 3 H2
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Consider the reaction of 75.0 g of oxygen gas as follows:
4Fe + 3O2 2Fe2O3
How many moles
of oxygen gas
react?
2.344
2.344
mol
How many moles
of iron must react?
3.125
3.125
mol
How many moles
of product form?
1.5625
1.563
mol
What mass of
product forms?
249.516
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How many protons, neutrons and electrons are in each of the following.
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