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strojnjashka [21]
3 years ago
9

A sample of marble has a volume of 8 cm3 and a density of 2.75 g/cm3. What is its mass?

Chemistry
2 answers:
Firlakuza [10]3 years ago
7 0
Using the formula Density = Mass / Volume,

Mass = Density x Volume
Mass = 2.75 x 8 = 22g
Arte-miy333 [17]3 years ago
6 0

Answer: The correct answer is 22 g.

Explanation:

The expression for the relation between mass and density is as follows;

Density=\frac{m}{V}

Here, m is the mass of the object and V is the volume of the object.

It is given in the problem that A sample of marble has a volume of 8 cm^{3} and a density of  2.75 \frac{g}{cm^{3}}.

Calculate the mass of a sample marble.

m= (Density)(V)

Put V=8 cm^{3} and Density=2.75 \frac{g}{cm^{3}}.

m= (2.75)(8)

m=22 g

Therefore, the mass of a sample of a marble is 22 g.

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baherus [9]

a) The change here is that metallic iron is converted into ions and copper is deposited. This is called a displacement reaction.

b) \text{Fe} is oxidised in this reaction.

c)$ \mathrm{Fe_{(s)}+ CuSO_{4(aq)} \rightarrow FeSO_{4(aq)} + Cu_{(s)}}$

7 0
3 years ago
6.0 L of oxygen gas is at a temperature of 5K. If the temperature of the gas is lowered to 1K at constant pressure, what is the
DerKrebs [107]

Answer:

THE NEW VOLUME AT 1 K IS 1.2 L

Explanation:

Using Charles' law which states that the volume of a given gas is directly proportional to its temperature provided the pressure remains constant.

Mathematically written as;

V1/T1 = V2/T2   at constant pressure

V1 = Initial volume = 6L

T1 = initial temperature = 5K

T2 = Final temperature = 1K

V2 = final volume = unknown

Re-arranging the equation by making V2 the subject of the equation, we obtain;

V2 = V1 T2 / T1

V2 = 6 * 1 / 5

V2 = 1.2 L

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6 0
3 years ago
Read 2 more answers
1. The manufacturer of the vinegar used in the experiment stated that the vinegar contained 5.0% acetic acid. What is the percen
Naddik [55]

Answer:

72.8 % (But verify explanation).

Explanation:

Hello,

In this case, with the following obtained results, the percent error is computed as follows:

Volume of vinegar= 7.0 mL

Volume of NaOH= (7+6.6+6.4)/3= 6.7 mL

Used concentration of NaOH= 1.5M

Concentration of acetic acid= (concentration of NaOH*volume of NaOH)/volume of vinegar= (6.7mL*1.5M)/7.0M= 1.44M

Assuming we have 100 mL (0.100L) of vinegar, moles of acetic acid in vinegar = 1.44M x 0.100 L= 0.144 mol

Mass of acetic acid in 100g of vinegar = 0.144 mol x 60.0g/mol= 8.64 g

% of acetic acid in vinegar=8.64 %

% error in percentage of acetic acid = [(8.64% - 5.0%)/5.0] x 100=72.8 %

Clearly, this result depend on your own measurements, anyway, you can change any value wherever you need it.

Regards.

8 0
3 years ago
Please help ASAP
VARVARA [1.3K]

Answer:

Based on my EXPLAIN i think the answer is C.

Explanation: A chemical reaction is a process that leads to the chemical transformation of one set of chemical substances to another. Classically, chemical reactions encompass changes that only involve the positions of electrons in the forming and breaking of chemical bonds between atoms, with no change to the nuclei (no change to the elements present), and can often be described by a chemical equation. Nuclear chemistry is a sub-discipline of chemistry that involves the chemical reactions of unstable and radioactive elements where both electronic and nuclear changes can occur.

8 0
3 years ago
The residue of coal decomposition that is used in the manufacture of steel is called: 1. coal gas 2. coke 3. coal tar
bagirrra123 [75]
The residue of coal decomposition in the manufacture of steel is coal tar. It is a by product of the coking process in the blast furnace. Coal gas is another by product but is not the answer becuase this is not a residue which is a solid. Coal gas is a gas. Coke in fact is one of the reactants fed for steel making. Answer is choice 3.
5 0
3 years ago
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