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notsponge [240]
3 years ago
5

How to find a percentage of a numberExample:        30% off of 120 dollars

Mathematics
2 answers:
Sidana [21]3 years ago
8 0
Times a number by a percent. First turn 30% Ino .3 by putting the decimal point 2 times to the l .
vlabodo [156]3 years ago
7 0
Each percent is basically a decimal in a different form. So 30% .3 (just move the decimal 2 times). Now multiply 120 by .3 and get 36. Just subtract 36 from 120 and get 84.
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For the reaction 2Fe + O2 → 2FeO, how many grams of iron oxide are produced from 42.4 mol of iron?
Butoxors [25]

In the balanced reaction

2 Fe + O₂   →   2 FeO

2 moles of iron (Fe) react with 1 mole of molecular oxygen (O₂) to produce 2 moles of iron oxide (FeO). The ratio of Fe to FeO is 1-to-1, so if one starts with 42.4 mol of Fe, one will end up with the same amount of FeO, 42.4 mol.

Look up the molar mass of Fe and O:

• Fe = 55.845 g/mol

• O = 15.999 g/mol

Then the molar mass of FeO is approximately 71.835 g/mol, and so the mass of 42.4 mol of FeO is

(42.4 mol) × (71.835 g/mol) ≈ 3050 g

8 0
3 years ago
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Mrac [35]
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Hope this helps
6 0
3 years ago
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liberstina [14]
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5 0
3 years ago
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Aleksandr-060686 [28]

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Brainliest is appreciated.

7 0
3 years ago
Read 2 more answers
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Tems11 [23]

Answer:

1 zero:  Answer C

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3 0
3 years ago
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