3 years ago

A chemist has 12 liters of a 25% acid solution. how many liters of water must be added to obtain a 20% acid solution?

Chemistry

1 answer:

NemiM [27]3 years ago

4 0

Three liters of water

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130cals.com

gregori [183]

Answer:x=3.76

Explanation:

6 0

2 years ago

What is 30-9x2*2-21-4+4

IgorC [24]

Answer:
9 (1-2x²)

Explanation:
The given expression is:
30 - 9x²*2 - 21 - 4 + 4
The first step is to compute the multiplication. This will give:
30 - 18x² - 21 - 4 + 4
Then, we will add like terms as follows:
(30-21-4+4) - 18x²
= 9 - 18x²
Finally, we can take the 9 as a common factor from both terms, this will give:
9 (1-2x²)

Hope this helps :)

5 0

3 years ago

How many solutions does the equation (3x + 7) = -4 have?<br>B. one<br>C. WO<br>D. infinitely many

Eddi Din [679]

Answer:

Its One

Explanation:

hope it helps!

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8 0

3 years ago

Scientist use alternative ways to seek out if a fault is active which one isn't include

dalvyx [7]

Answer:

Geologists commonly consider faults to be active if there has been movement observed or evidence of seismic activity during the last 10,000 years. Active faulting is considered to be a geologic hazard - one related to earthquakes as a cause.

Explanation:

Plz mark brainliest thanks

3 0

2 years ago

4.Calculate the volume of 40g of Helium (He) at rtp.

Oksana_A [137]

Answer:

2.24dm³

Explanation:

Given parameters:

Mass of He = 40g

Unknown:

Volume of Helium = ?

Solution:

To solve this problem, we convert the given mass to number of moles.

Number of moles = $\frac{mass}{molar mass}$

molar mass of He = 4g/mol

Number of moles = $\frac{4}{40}$ = 0.1mole

So;

1 mole of gas at rtp occupies a volume of 22.4dm³

0.1 mole of He will occupy a volume of 0.1 x 22.4 = 2.24dm³

4 0

3 years ago