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gayaneshka [121]

3 years ago

8

Hard water contains relatively large concentrations of

2 answers:

ycow [4]3 years ago

5 0

Answer:

<u><em>D.</em></u>

<u><em>All of these ions</em></u>

Explanation:

Hope this helps:)

galben [10]3 years ago

3 0

Answer:

I think the answer is All of these ions

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My barometer is reading 1253 torr. What is the pressure in mmHg?

kobusy [5.1K]

Answer:

The pressure in mmHg is 1253 (option C)

Explanation:

Two quantities are directly proportional if when multiplying or dividing one of them by a number, the other is multiplied or divided by that number. In other words, the magnitudes are directly proportional when one magnitude increases and so does the other in the same proportion; or when one magnitude decreases and so does the other in the same proportion.

The rule of three or is a way of solving proportionality problems between three known values and an unknown value, which can be applied to directly proportional quantities as follows:

a ⇒ b

c ⇒ x

So $x=\frac{c*b}{a}$

where a, b and c are data and x is the unknown value to be calculated.

In this case, knowing that 1 Torr = 1 mmHg, the rule of three can be applied as follows: if 1 torr is equal to 1 mmHg, 1253 torr is equal to how many mmHg?

$pressure=\frac{1253 torr*1 mmHg}{1 torr}$

pressure= 1253 mmHg

<u><em>The pressure in mmHg is 1253 (option C)</em></u>

6 0

3 years ago

Predict the direction in which the equilibrium will lie for the reactionC6H5COO- + HF C6H5COOH + F-.Ka(C6H5COOH) = 6.5 x 10-5; K

Llana [10]

Answer:

Equilibrium will lie to the right.

Explanation:

$K_{a}(HF)> K_{a}(C_{6}H_{5}COOH)$

That means HF is stronger acid than $C_{6}H_{5}COOH$ .

Alternatively, it can be said that $C_{6}H_{5}COO^{-}$ is a stronger base than $F^{-}$ .

Therefore HF readily gives proton to $C_{6}H_{5}COO^{-}$ to form $C_{6}H_{5}COOH$ and $F^{-}$ than the reverse reaction.

So, the equilibrium will lie more towards the right i.e. towards formation of $C_{6}H_{5}COOH$ and $F^{-}$ .

7 0

3 years ago

PLease HELP How many molecules of CO2 are there in 55 grams of CO2?

Dafna11 [192]

Explanation: By definition there are 6.022×1023 carbon dioxide molecules in a 44.0⋅g mass.

6 0

3 years ago

Read 2 more answers

For a theoretical yield of 5.52 g and percent

Dimas [21]

Answer:

2.85868104g

Explanation:

<u>Actual yield </u>

Theoretical yield x 100 = 51.7877%

So, do the inverse and you get 2.85868104g

7 0

3 years ago

Calculate the ph of a buffer that is 0.225 m hc2h3o2 and 0.162 m kc2h3o2. the ka for hc2h3o2 is 1.8 Ã 10-5. 4.60 9.26 4.74 4.89

Stella [2.4K]

Answer:

The pH of the buffer solution is 4.60.

Explanation:

Concentration of acid = $[HC_2H_3O_2]=0.225 M$

Concentration of salt = $[KC_2H_3O_2]=0.162 M$

Dissociation constant = $K_a=1.8 \times 10^{-5}$

The pH of the buffer can be determined by Henderson-Hasselbalch equation:

$pH=pK_a+\log\frac{[salt]}{[acid]}$

$pH=-\log[1.8 \times 10^{-5}]+\log\frac{0.162 M}{0.225 M}$

pH = 4.60

The pH of the buffer solution is 4.60.

8 0

3 years ago

Read 2 more answers