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3 years ago

What is the final concentration if water is added to 0.25 L of a 8M NaOH solution to make 4.0 L of a diluted NaOH solution?

Chemistry

1 answer:

mojhsa [17]3 years ago

6 0

Answer:

the answer is 0.5 naoh solution

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a quantity of zinc reacts with sulfuric acid and produces 0.10g of hydrogen. how many particles of zinc are required socratic.or

alekssr [168]

Answer:

grams of zinc required = 3.24 g

Particles of zinc required = $2.99\times 10^{22}$

Explanation:

Given that:-

Mass of hydrogen gas produced = 0.10 g

Calculation of the moles of $H_2$ as:-

Mass = 0.10 g

Molar mass of $H_2$ = 2.016 g/mol

The formula for the calculation of moles is shown below:

$moles = \frac{Mass\ taken}{Molar\ mass}$

Thus,

$Moles= \frac{0.10\ g}{2.016\ g/mol}$

$Moles= 0.0496\ mol$

According to the reaction shown below:-

$Zn+H_2SO_4\rightarrow ZnSO_4+H_2$

1 mole of hydrogen gas is produced when 1 mole of zinc reacts

So,

0.0496 mole of hydrogen gas is produced when 0.0496 mole of zinc reacts

Moles of Zinc required = 0.0496 moles

Molar mass of zinc = 65.38 g/mol

mass= Moles*Molar mass = $0.0496\ moles\times 65.38\ g/mol=3.24\ g$

Also, 1 mole of Zinc contains $6.023\times 10^{23}$ particles

0.0496 mole of Zinc contains $0.0496\times 6.023\times 10^{23}$ particles

Particles of zinc required = $2.99\times 10^{22}$

6 0

3 years ago

chlorine has an average atomic mass of 35.45 amu. the two naturally occurring isotopes of chlorine are clorine-35 and chlorne -3

Licemer1 [7]

Answer:

See below.

Step-by-step explanation:

The two isotopes are Cl-35 and Cl-37.

The average atomic mass (35.45 u) is closer to 35 u, so most of the atoms are Cl-35.

mass number = number of protons + number of neutrons

A = p + n

35 = 17 + n

n = 35 – 17

n = 18

∴ Most chlorine atoms contain 18 neutrons.

5 0

3 years ago

Does a bucket of water and an ice cube have the same chemical properties?

leva [86]

No, their specific heats are different. For water, and ice

3 0

3 years ago

Please help!!! Really confused about how to get a balanced equation with this question!!

sammy [17]

Water vapour +carbon dioxide= oxygen and hydrocarbon I think?

5 0

3 years ago

Given the balanced reaction: Zn + 2HCl H2 + ZnCl2 How many grams of zinc are needed to produce 5 grams of H2?

kumpel [21]

Answer:

$161.9gZn$

Explanation:

Hello there!

In this case, according the given balanced chemical reaction:

$Zn + 2HCl\rightarrow H_2 + ZnCl_2$

It is possible to evidence the 1:1 mole ratio of hydrogen (molar mass = 2.02 g/mol) to zinc (atomic mass = 65.41 g/mol) which is used to calculate the grams of the latter needed for the production of 5 grams of the former via stoichiometry:

$5gH_2*\frac{1molH_2}{2.02gH_2}*\frac{1molZn}{1molH_2} *\frac{65.41gZn}{1molZn}\\\\=161.9gZn$

Best regards!

5 0

3 years ago