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4 years ago

I neeeed helpp please

Chemistry

1 answer:

Ymorist [56]4 years ago

6 0

4= lemon juice contains CITRIC ACID and represents a pH of 2.3

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A solution is made by dissolving 4.35 g of glucose (C6H1206) in 25.0 mL of water at 25 °C.Calculate the molality of glucose in t

Roman55 [17]

Answer:

The molality is unchanged (0.96 molal)

Explanation:

Step 1: Data given

mass of glucose = 4.35 grams

volume of water = 25.0 mL

Density of water = 1.00 g/mL

Molar mass of glucose = 180.156 g/mol

Step 2: Calculate number of moles

moles of glucose = mass of glucose / Molar mass of glucose

moles of glucose = 4.35 grams / 180.156 g/mol

moles of glucose = 0.024 moles

Step 3: Calculate mass of water

mass = density * volume

mass of water = 1.00 g/mL * 25.0 mL

mass of water = 25 g = 0.025 kg

Step 4: Calculate molality

molality = Number of moles / mass of water

molality = 0.024 moles / 0.025 kg

molality = 0.96 molal

Suppose you take a solution and add more solvent, so that the original mass of solvent is doubled.

This means double mass of water = 2*0.025 kg = 0.050 kg

Now molality is 0.024 moles / 0.050 kg = 0.48 molal

When the mass of solvent is doubled, the molality is halved from 0.96 molal to 0.48 molal

You take this newsolution and add more solute, so that the original mass of the solute is doubled.

This means double mass of glucose = 2*4.35 g = 8.70 g

8.70 grams of glucose = 8.7 grams * 180.156 g/mol = 0.048 moles

molality = 0.048 moles / 0.050 kg = 0.96 molal

The molality is unchanged

5 0

4 years ago

How many g NaOH should be required to completely react 1.876 g of Copper (II) nitrate?

Doss [256]

$\\ \tt\hookrightarrow 2NaOH+Cu(NO_3)_2\longrightarrow 2NaNO_3+Cu(OH)_2$

Moles of copper nitrate:-

$\\ \tt\hookrightarrow \dfrac{1.876}{187.56}=0.001mol$

1mol of Copper nitrate reacts with 2mol NaOH
0.001mol will react with 0.002mol NaOH

Madd of NaOH

$\\ \tt\hookrightarrow 0.002(40)=0.08g$

8 0

2 years ago

WILL GIVE BRAINLIEST ANSWER ASAP

Gre4nikov [31]

The answer is b. Food chains are extremely fragile. In many occasions, the health of a species will depend on the survival of the species right under. At the end, we realize that the chain is quite fragile because everyone depends on each other, but not every species are strong enough to survive the change in their environment.

6 0

4 years ago

Which natural occurrence is an example of a long-term environmental change?

ki77a [65]

Answer:

Tectonic plates

Explanation:

Tectonic plates shifting is long term which creates a short term Earthquake, I hope this helped.

4 0

3 years ago

The reaction A+B-> C+D rate=k[A][B]^2 has an initial rate of 0.0810 M/s. What will the initial rate be if [A] is halved and [

makkiz [27]

The first to do is to isolate the constant, k, to one side. The rate expression would then be:

k = rate/ [A][B]^2

This constant, k, will be the same for the given reaction at a certain temperature. Then, we can relate a second rate to this reaction.

rate1/ [A1][B1]^2 = rate2/ [A2][B2]^2

First question:
0.0810 / [A1][B1]^2 = rate2/ [A2/2][3B2]^2
rate2 = (0.0810 [A2/2][3B2]^2 )/ [A1][B1]^2
rate2 = 0.3645 M/s

Second Equation:
0.0810 / [A1][B1]^2 = rate2/ [A2/2][3B2]^2
rate2 = (0.0810 [3A2][B2/2]^2 )/ [A1][B1]^2
rate2 = 0.0608 M/s

3 0

3 years ago