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Firdavs [7]
3 years ago
8

What mass of aluminum is required if 40.0 grams of iron (III) oxide is to be completely consumed as

Chemistry
1 answer:
SVETLANKA909090 [29]3 years ago
5 0

Answer:

13.5

Explanation:

Molar mass of Fe2O3 = 2*56 + 16*3 = 112 + 48 =160 approximate value

Number of moles of Fe2O3 = mass/molar mass = 40/160 = 0.25 mol

The reaction is balanced. Fine

1 mol of Fe2O3--------> 2 mol of Al

0.25 mol--------> 0.25*2 = 0.5 mol of Al

Mass of Al required = Number of moles * Molar mass

= 0.5 * 27 = 13.5 g

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P4O10 -> 4P+5O2 How many moles of phosphorus would be produced if 5.3 mol of P4O10 reacted?
viktelen [127]

Answer:

21.2 moles.

Explanation:

Hello!

In this case, for the given chemical reaction, we can see there is a 1:4 mole ratio between tetraphosphorous decaoxide and phosphorous; therefore, the following proportional factor provides the requested moles of phodphorous:

n_P=5.3molP_4O_{10} *\frac{4molP}{1molP_4O_{10}} \\\\n_P=21.2molP

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3 years ago
the men's world record for swimming 1500.0 m in a long course pool (as of 2007) is 14 min 34.56 s. At this rate, how many second
Lyrx [107]

140 s. It would take 140 s to swim 0.150 mi .

<em>Step 1</em>. Convert the <em>time to seconds</em>

Time = 14 min × (60 s/1 min) + 34.56 s = 840 s + 34.56 s = 874.56 s

<em>Step 2</em>. Convert <em>miles to metres </em>

Distance = 0.150 mi × (1609.3 m/1 mi) = 241.4 m

<em>Step 3.</em> Calculate the <em>time to swim 241.4 m</em>

Time = 241.4 m × (874.56 s/1500 m) = 140 s

(<em>As of 2012, the men’s freestyle record for 1500 m was 14:31.02</em>.)

5 0
4 years ago
I need help on this one pliz
Artyom0805 [142]
The answer would be 16.04.
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A scientist eliminated all living organisms in a jar of soup by heating it. He then left the soup jar uncovered for some days. A
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Spores in the air or contamination through some sort of insect interaction. In an open system, there are billions of microbial agents floating around. With an open container containing a food source and time, the likelihood of contamination is nearly %100.
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3 years ago
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Yes you are correct.
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