27 g of Al will react with how much mass of O2 to produce Al2O3

A mechanic uses a mechanical lift to raise a car. The car weighs 10,200 N. The work required to do this was 22,440 J.

Alja [10]

The answer is B, because W= F*d

6 0

3 years ago

How much energy, in joules, is released when 17 kilograms of granite is cooled from 45 C to 21 C?

Lostsunrise [7]

Answer is: D. 327,992.8 J.
m(granite) = 17 kg = 17000g.
ΔT(granite) = 21°C - 45°C = -24°C (-24K).
cp(granite) = 0,804 J/g·°C, specific heat capacity of granite.
Q = m(granite) · ΔT(granite) · cp(granite).
Q = 17000 g ·(-24°C)· 0,804 J/g·K.
Q = -327990 J.
The granite lost 327990 joules of energy.
Q - amount of energy gained or lost.

8 0

3 years ago

Read 2 more answers

Select the ion. a) NO2 b)H2SO4 c) Al+3 ...?

Gemiola [76]

I believe the correct answer from the choices listed above is the third option. The ion would be Al+3. It is obvious because among the options, this is the only substance that has a charge. An ion is an atom or a molecule in which the total number of electrons is not equal to the total number of protons, giving the atom or molecule a net positive or negative electrical charge.

5 0

4 years ago

Read 2 more answers

A reversible reaction is a reaction that takes place in the____1____ . If the reaction were to_____2____, the rate of the forwar

klemol [59]

Answer : The correct option for blank 1 is, Forward and Backward direction .

The correct option for blank 2 is, Reach equilibrium .

Explanation :

Reversible reaction : It is a reaction in which two or more reactants react together to give products and these products react with other product to form reactants.

It occurs in both the directions at the same time, forward and backward direction.

Irreversible reaction : It is a reaction in which reactants react together to give a product but it can not revert back into the reactants.

It occurs in forward direction only.

Equilibrium reaction : It is a reaction in which the rate of forward reaction is equal to the rate of backward reaction.

Completion reaction : It is a reaction in which the reactants react together to give products. when the reaction goes to completion theta means all the reactants are used up and you have only products in the reaction.

8 0

4 years ago

Assume that a milliliter of water contains 20 drops. How long, in hours, will it take you to count the number of drops

garri49 [273]

Answer:

126.18 hr

Explanation:

Data given:

1 mL of water = 20 drops

count rate = 10 drops/s

time in hours for one gallon = ?

Solution:

First we calculate number of mL (milliliter) of water in gallon

As we know

1 gallon = 3785.4 mL

As,

1 galon consist of 3785.4 mL of water, so now we count number of drops that contain 3785.4 mL of water

As we Know 1 mL water contain 20 drops then 3785.4 mL of water contain how many drops:

Apply unity formula

1 mL water ≅ 20 drops

3785.4 mL water ≅ X drops

Do cross multiplication

X drops of water = 20 drops x 3785.4 mL / 1 mL

X drops of water = 75708 drops

So, we come to know that one gallon contain 75708 drops of water and we have to calculate the time in hour to count these drops

First we calculate time in seconds

As we Know 10 drops water count in one second then how many seconds it will take to count 75708 drops

Apply unity formula

1 second ≅ 10 drops

X second ≅ 75708 drops

Do cross multiplication

X second = 1 second x 75708 drops / 10 drops

X second = 7570.8 second

So it take 7570.8 second to count 1 gallon water drops

Now convert seconds to hours

As,

60 seconds = 1 hr

7570.8 second = 7570.8 / 60 = 126.18 hr

So it take 126.18 hr to count 1 gallon water drops.

6 0

4 years ago