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Blababa [14]
3 years ago
9

●1. What is the density of 2.0 g of a substance that has a volume of 5.0 mL?

Chemistry
1 answer:
anygoal [31]3 years ago
7 0
Density  =  Mass / Volume 

Density  =  2.0g /  5.0ml

Density = 0.4 g/ml
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Number of grams of hydrogen than can be prepared from 6.80g of aluminum​
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0.7561 g.

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  • Firstly, we need to calculate the no. of moles of (6.8 g) of Al:

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<em>Using cross multiplication:</em>

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0.252 mol of Al need to react → ??? mol of H₂.

∴ the no. of moles of H₂ that can be prepared from 6.80 g of aluminum = (3.0 mol)(0.252 mol)/(2.0 mol) = 0.3781 mol.

  • Now, we can get the mass of H₂ that can be prepared from 6.80 g of aluminum:

mass of H₂ = (no. of moles)(molar mass) = (0.3781 mol)(2.0 g/mol) = 0.7561 g.

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All organic molecules have what element in common?
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Read 2 more answers
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