3 years ago

Oops accidentally wrote a question i dont need answered

Chemistry

2 answers:

sammy [17]3 years ago

8 0

Answer:

ok thanks for points

Explanation:

zmey [24]3 years ago

5 0

Answer:

its fine give a responds anyways

Explanation:

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Lina20 [59]

Answer:

B) Hope this helps! :)

Explanation:

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2 years ago

Which statement is TRUE about enzymes?

nikklg [1K]

Answer:

the answer is

i guessed btw

Explanation:

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3 years ago

WILL GIVE BRAINLIEST AND POINTS!!

Aleksandr [31]

Answer:

H2O= +2

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3 years ago

How many molecules of oxygen are produced when a sample of 38.9 g of water is decomposed by electricity?

statuscvo [17]

Answer:

A) $6.5\times 10^{23}\ \text{molecules}$

Explanation:

m = Mass of water = 38.9

M = Molar mass of water = 18 g/mol

$N_A$ = Avogadro's number = $6.022\times 10^{23}\ \text{mol}^{-1}$

The reaction of electrolysis would be

$2H_2O(l)\rightarrow 2H_2(g)+O_2(g)$

Number of moles of $H_2O$

$n=\dfrac{m}{M}\\\Rightarrow n=\dfrac{38.9}{18}\ \text{mol}$

From the reaction it can be seen that 2 moles of $H_2O$ gives 1 mole of $O_2$

So, number of moles of $O_2$ produced is

$\dfrac{38.9}{18}\times \dfrac{1}{2}=1.081\ \text{mol}$

Number of molecules

$1.081N_A=1.081\times 6.022\times 10^{23}\\ =6.5\times 10^{23}$

So, $6.5\times 10^{23}\ \text{molecules}$ of oxygen is produced.

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2 years ago

The ability of a substance to combine chemically with another substance.

Marysya12 [62]

Reactivity. It is the ability of matter to combine chemically with other substances.

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2 years ago