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pochemuha
3 years ago
5

How is modeling useful to scientists?

Chemistry
1 answer:
baherus [9]3 years ago
6 0
C it illustrates possible outcomes
You might be interested in
Sodium hydroxide reacts with aluminum and water to produce hydrogen gas:2 Al(s) + 2 NaOH(aq) + 6 H2O(l) → 2 NaAl(OH)4(aq) + 3 H2
Kay [80]

Answer: 0.147 grams

Explanation:

To calculate the moles :

\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}    

\text{Moles of} Al=\frac{1.33g}{27g/mol}=0.049moles

\text{Moles of} NaOH=\frac{4.25g}{40g/mol}=0.106moles

2Al(s)+2NaOH(aq)+6H_2O(l)\rightarrow Na(Al(OH)_4(aq)+3H_2(g)

According to stoichiometry :

2 moles of Al require = 2 moles of NaOH/tex]Thus 0.049 moles of [tex]Al will require=\frac{2}{2}\times 0.049=0.049moles  of NaOH

Thus Al is the limiting reagent as it limits the formation of product and NaOH is the excess reagent.

As 2 moles of Al give = 3 moles of H_2

Thus 0.049 moles of Al give =\frac{3}{2}\times 0.049=0.0735moles  of H_2

Mass of H_2=moles\times {\text {Molar mass}}=0.0735moles\times 2g/mol=0.147g

Thus 0.147 g of H_2 will be produced from the given masses of both reactants.

6 0
3 years ago
How would you combine reactions A–C, shown below, to obtain the overall reaction: $$ Please select all that apply.
snow_lady [41]

Answer:

By eating a sandwich

Explanation:

your welcome nigel

4 0
3 years ago
Water and salt are compounds made of the combination of more than
Nikolay [14]

This is false

А

Because they are compounds, they cannot be pure substances.

Because:Compounds are pure substance

3 0
3 years ago
What do you think would happen if you mix toothpaste with coffee?
marusya05 [52]
A reaction might happen or nothing might happen try one of them don’t know if I’m right though!
8 0
4 years ago
Read 2 more answers
Which of the following masses is the largest?
FinnZ [79.3K]

Answer:

0.020 kg=20 g  this the largest

20.0 mg=.020g

.200g

2000ug

Explanation:

4 0
3 years ago
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