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3 years ago

Someone please help me I will give BRAINLIST

Chemistry

2 answers:

faltersainse [42]3 years ago

4 0

Answer:

Explanation:

blsea [12.9K]3 years ago

3 0

7.g

well there is your answers

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a 5.og of sample of compound dissolve in enough water to form 100ml of a solution .this solution form osmotic pressure of 25 tor

storchak [24]

2889 tor plz believe

7 0

3 years ago

A solution of ethanol (c2h5oh) in water is prepared by dissolving 75.0 ml of ethanol (density 0.79 g/cm3 ) in enough water to ma

navik [9.2K]

Given the density of ethanol = 0.79 $\frac{g}{cm^{3} }$

Volume of ethanol = 75.0 mL

Calculating the mass if ethanol from density and volume:

$75.0 mL * \frac{0.79g}{1cm^{3} } *\frac{1cm^{3} }{1mL}=59.25g$

Molar mass of ethanol = (2*atomic weight of C)+(6*atomic weight of H)+(1*atomic weight of O)

=(2*12g.mol) + (6*1g/mol) + (1*16g/mol)

=46g/mol

Moles of ethanol = $59.25 g *\frac{1 mol}{46g} =1.288 mol$

Volume of the solution = 250.0 mL

Converting the volume from mL ot L:

$250.0mL*\frac{1L}{1000mL}=0.2500L$

Molarity of ethanol in the solution = $\frac{1.288mol}{0.250L} =5.15 M$

5 0

3 years ago

The volume of a gas is decreased from 100 liters at 173.0°C to 50 liters at a constant pressure. After the decrease in volume, w

Minchanka [31]

Answer:

223.08 K

Explanation:

First we convert 173.0 °C to K:

173.0 °C + 273.16 = 446.16 K

With the absolute temperature we can use Charles' law to solve this problem:

T₁V₂=T₂V₁

Where in this case:

T₁ = 446.16 K

V₂ = 50 L

T₂ = ?

V₁ = 100 L

We input the data:

446.16 K * 50 L = T₂ * 100 L

And solve for T₂:

T₂ = 223.08 K

5 0

3 years ago

How many moles of copper Il sulfide can be produced from 2.8 moles of sulfur? Cu + S --> CuS

Kamila [148]

Answer: 2.8 moles of copper (Il) sulfide $(CuS)$ will be produced from 2.8 moles of sulphur.

Explanation:

The balanced chemical reaction is:

$Cu+S\rightarrow CuS$

According to stoichiometry :

1 mole of $S$ produce = 1 mole of copper (Il) sulfide $(CuS)$

Thus 2.8 moles of $S$ will produce= $\frac{1}{1}\times 2.8=2.8moles$ of copper (Il) sulfide $(CuS)$

Thus 2.8 moles of copper (Il) sulfide $(CuS)$ will be produced from 2.8 moles of sulphur.

5 0

3 years ago

In a series circuit there are 17 light bulbs, each providing 1 ohm of resistance. What is the total resistance?

Sauron [17]

Answer:

17 ohms

Explanation:

Given that,

In a series circuit there are 17 light bulbs, each providing 1 ohm of resistance.

We need to find the total resistance of the circuit.

The equivalent resistance for series combination is given by :

$R_{eq}=R_1+R_2+....$

For 17 light bulbs, the equivalent resistance is given by :

$R_{eq}=R+R+....\text{upto 17 terms}\\\\R_{eq}=17R\\\\=17$

Hence, the total resistance is 17 ohms. Hence, the correct option is (d).

7 0

3 years ago