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3 years ago

What are the answers to the blanks to make this equation balanced

Chemistry

1 answer:

Eddi Din [679]3 years ago

5 0

1Al+6NaOH==>2 $Na_{3}$ Al $O_{3}$ +3 $H_{2}$

Hope this helps!

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How many molecules are there in 122 grams of NO2

AnnyKZ [126]

Thus, there are 1.47 × 10^(23) molecules present in 122 grams of NO2.

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2 years ago

Phosphorus-32 is a commonly used radioactive nuclide in biochemical research, particularly in studies of nucleic acids. the half

lora16 [44]

given days = 42 days
So, number of half life, n = 42/14.3 = 2.93
So, after 42 days, the mass of sodium phosphate sample left = original mass
x (1/2)^n,
= 157 mg x (1/2)^2.93 = 20.60 g of Na3PO4 after 42 days
Formula mass of Sodium phosphate = 3(23) + 32 + 4(16) amu = 165 amu
165 g of sodium phosphate contains 32 g of Phosphorus
20.60 g ------------------------------? = 20.60 x 32/ 165 =3.99g of P32

3 0

3 years ago

a drop of water weighing 0.48 g condenses on the surface of a 55-g block of aluminum that is initially at 25C. if the heat durin

Gwar [14]

Mass of water vapor is 0.48 gms.

Weight of the aluminium block is 55 gms.

Heat of vaporization of water at 25 degree Celsius is 44.0 kJ/mol.

The amount of heat given by the condensation is:

q = Heat of vaporization × Mass of vapor / Molar mass of steam

= 44.0 kJ/mol ×0.48 g / 18 g/mol

= 1.173 kJ

Now the final temperature of the metal block is calculated by the formula:

q = m × c × ΔT

q = m × c × (T₂ - T₁)

Here, q is the amount of heat, m is the mass of the metal, c is the specif heat of the metal, T₁ is initial temperature, and T₂ is the final temperature.

Now, substituting the values we get,

1.173 kJ = 55 g × 0.903 J/g. ° C * (T₂ - 25°C)

1.173 × 10³ J = 55 g × 0.903 J/g. degree C × (T₂ - 25°C)

1.173 × 10³ = 49.665 ° C * (T₂ - 25° C)

T₂ = 49° C.

Thus, the final temperature of the metal block is 49° C.

8 0

3 years ago

What is the molarity (M) of a solution containing 0.0171 moles of NaCl in 0.122 L of solution?<br> M

gladu [14]

The molarity of the solution is 0.14 M/L.

<u>Explanation:</u>

Molarity is defined as the quantitative measure of number of molecules of the solute dissolved in per litre of the solution. So it can be calculated by determining the ratio of number of molecules of the solute to the volume of the solution.

$Molarity = \frac{No.\ of\ moles\ of\ solute\ dissolved}{Volume\ of\ the\ solution}$

As here it is stated that 0.0171 moles of NaCl is dissolved in 0.122 L of solution, this means the no.of moles of solute is given as 0.0171 and the volume of the solution is 0.122 L.

Then,

$Molarity=\frac{0.0171}{0.122} = 0.14$

Thus, the molarity of the solution is 0.14 M/L.

8 0

3 years ago

Why does the heat of the heating element stop when the desired temperature in an electric iron is reached

Eva8 [605]

Im not sure but is it to do with it state for example water when reached to a certain temperature turns into gas
until there is nothing left

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3 years ago