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Neko [114]
3 years ago
11

Please help I will reward brainly! NEED DONE ASAP

Chemistry
1 answer:
S_A_V [24]3 years ago
3 0
Because it doesn't get direct sunlight so it gets cool
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Number of grams of hydrogen than can be prepared from 6.80g of aluminum​
Anastaziya [24]

Answer:

0.7561 g.

Explanation:

  • The hydrogen than can be prepared from Al according to the balanced equation:

<em>2Al + 6HCl → 2AlCl₃ + 3H₂,</em>

It is clear that 2.0 moles of Al react with 6.0 mole of HCl to produce 2.0 moles of AlCl₃ and 3.0 mole of H₂.

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

no. of moles of Al = mass/atomic mass = (6.8 g)/(26.98 g/mol) = 0.252 mol.

<em>Using cross multiplication:</em>

2.0 mol of Al produce → 3.0 mol of H₂, from stichiometry.

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.

5 0
3 years ago
In water, what happens to a base?
BartSMP [9]
A base in water will form hydroxide ions. This is because bases are AOH while acids are AH+. I hope this helps!
5 0
3 years ago
What does a control group show in an experimental investigation?
kicyunya [14]

Answer:

the effects that the scientists are causing by manipulating varuables

7 0
2 years ago
What is the half-life of a radioisotope if it decays to 25% of its original activity in 7 yr?
Pepsi [2]

Answer:

3.5 yrs

Explanation:

If a sample has decayed to 25%, this means 2 half-lives have passed. We are given this is equal to 7 yrs, and it follows that one half life is 3.5 yrs.

7 0
2 years ago
A base that dissociated entirely into metal ions and hydroxide ions is known as a ________.
viva [34]
Strong base since it is completely soluble
6 0
3 years ago
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