Why is water necessary for rusting to happen?

When aluminum is placed in concentrated hydrochloric acid, hydrogen gas is produced.

KatRina [158]

Answer : The mass of aluminium (Al) is 0.413 g

Solution : Given,

Volume of $H_{2}(g)$ at STP = 513 ml = 0.513 L ( 1 L = 1000 ml )

Molar mass of aluminium = 26.98 g/mole

First we have to calculate the moles of $H_{2}(g)$ .

At STP,

1 mole occupies 22.4 L volume

now, 0.513 L gives $\frac{1mole\times0.513L}{22.4L}$ moles of $H_{2}(g)$

The moles of $H_{2}(g)$ = 0.0229 moles

The Net balanced chemical reaction is,

$2Al(s)+6HCl(aq)\rightarrow 2AlCl_3(aq)+3H_2(g)$

From the balanced chemical reaction, we conclude that

2 moles of Aluminium (Al) produces 3 moles of hydrogen gas

Now the number of moles of aluminium required in 0.0229 moles of hydrogen gas = $\frac{2moles\times 0.0229moles}{3moles}$ = 0.0153 moles

Now we have to calculate the mass of aluminium.

Mass of aluminium = number of moles × Molar mass = 0.0153 moles × 26.98 g/mole = 0.413 g

The mass of aluminium required is 0.413 g.

7 0

3 years ago

N an experiment, Theresa measured 15.00 mL of water. She must have used a

Serjik [45]

She must have used a beaker.

Because it goes over 1,500 mL

I hope this helps :)

4 0

3 years ago

what is the correct conversion factor by which to multiply to convert moles of nitrogen to moles of ammonium nitrate (NH4NO3)

Ostrovityanka [42]

Answer:

0.5

Explanation:

1 mole of ammonium nitrate contains 2 moles of nirogen

1 mole of nitrogen converts to 0.5 moles of ammonium nitrate

the conversation factor is 0.5

6 0

3 years ago

Read 2 more answers

if you had to explain to someone the difference between heat and temperature, how could you use one of the following to demonstr

Rainbow [258]

Answer:

We associate paper money or points in video games, as molecules that make a heat transfer or an increasin in its temperature.

Explanation:

The meaning of heat is associated with an energy transfer, where for example if we put a spoon in a cup of hot drink, the drink will be transferring heat to the spoon. It is a transfer of energy between two bodies due to a difference between their temperatures.

Temperature is associated with the movement of kinetic energy of the molecules. When the temperature is higher, the kinetic energy is higher, so as more detained they are, temperature will be lower.

If we take paper money as molecules, the greater movement of money explains that we have an increase in temperature (we would be hot), even if we think of video games, for example gambling where as more points we gain, we generate an increase in the movement of "molecules".

When we use paper money to buy something we are doing a heat transfer.

We can associate terms to the Thermodynamic where

Heat = Internal energy + work

For clearance would be

Internal energy = Heat - Work

The money we use less the work we do keeps our internal energy. If in a gambling video game, we earn points over and over again, when withdrawing the prize we perform "heat transfer".

4 0

3 years ago

What do the little numbers (subscripts) next to the lower right of each letter mean in the C₂H₄O₂?

nata0808 [166]

Answer:

It represents the <em>number of atoms</em> of that particular element present in the compound. In C₂H₄O₂ there are 2 Carbon atoms, 4 Hydrogen atoms and 2 Oxygen atoms.

3 0

2 years ago