540g
Explanation:
Given parameters:
Mass of the aluminium oxide = 1020g
Unknown:
Mass of aluminium = ?
Solution:
To find the mass of the aluminium formed from this reaction, we work from the known to the unknown. The known here is the mass of the aluminium oxide.
Using this mass, find the number of moles in the aluminium and relate it using the balanced equation to that of the unknown aluminium.
From the number of moles, we can easily find the mass of the aluminium.
Solving:
Balanced equation:
2Al₂O₃ → 4Al + 3O₂
Number of moles of Al₂O₃ =
Molar mass of Al₂O₃ = 2(27) + 3(16) = 102g/mol
Number of moles = = 10mol
From the balanced equation:
2 moles of Al₂O₃ produced 4 moles of Al
10 moles of Al will produce = 20moles of Al
Mass of Al = number of moles of Al x molar mass of Al = 20 x 27 = 540g
Learn more:
Number of moles brainly.com/question/13064292
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Answer:
12,000 units of heparin are received by patient in 24 hours.
Explanation:
10,000 units of heparin in 1000ml of D5W.
Units of heparin in 1 mL =
Rate at heparin drip set at = 50 ml/hour
Units of heparin in 50 ml of solution =
500 units of heparin are received by patient in an every hour.So, in 24 hours patient will receive:
of heparin
12,000 units of heparin are received by patient in 24 hours.
The answer is:
First, we need to look for the K molecular mass:
Also, we need to remember that 1 mol of a compound or element is equal to of that compound.
From the statement, we are asked to calculate how many atoms of K are present in 195,49 of K.
So, doing the calculations, we have:
So, we have atoms of K in 195,49 grams of K.
Have a nice day!