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3 years ago

12

Saline solutions (nacl in water) used to deliver intravenous drugs are 0.89%(w/v). what mass of nacl is found in 200 ml of such

a solution?

1 answer:

Gnom [1K]3 years ago

6 0

A ratio of 0.89% w / v or 0.0089 in fraction means that there is 0.89 weight of NaCl pero volume of solution. Therefore the mass of NaCl is:

mass NaCl = 0.0089 * 200

<span>mass NaCl = 1.78 grams</span>

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A scientist is examining a simple multicellular organism with a nucleus and specialized organelles that was found in a moist env

Elza [17]

Answer:Answer: (B) Archaebacteria

Explanation:

Explanation: Archaebacteria, like all prokaryotes, have no membrane bound organelles. This means that the archaebacteria are without nuclei, mitochondria, endoplasmic reticula, lysosomes, Golgi complexes, or chloroplasts. Because these organisms have no nucleus, the genetic material floats freely in the cytoplasm

4 0

4 years ago

Need help !!!!! ASAP

Oksi-84 [34.3K]

<h2>Hello!</h2>

The answer is:

The approximate volume is 9.84 L.

$V=9.84L$

<h2>Why?</h2>

Since we are given the numer of moles, the temperature and the pressure of the gas, we can calculate the approximate volume using The Ideal Gas Law.

The Ideal Gas Law is based on Boyle's Law, Gay-Lussac's Law, Charles's Law, and Avogadro's Law, and it's described by the following equation:

$PV=nRT$

Where,

P is the pressure of the gas.

V is the volume of the gas.

n is the number of moles of the gas.

T is the absolute temperature of the gas (Kelvin).

R is the ideal gas constant, which is equal to:

$R=0.082\frac{atm.L}{mol.K}$

So, we are given the information:

$n=1.5mol\\Temperature=300K\\Pressure=3.75atm$

Now, substituting the given information and isolating the Volume from The Ideal Gas Law equation, we have:

$PV=nRT$

$V=\frac{nRT}{P}$

$3.75atm*V=1.5mol*0.082*\frac{atm.L}{mol.K}*300K$

$V=\frac{ 1.5mol*0.082*\frac{atm.L}{mol.K}*300K}{3.75atm}\\\\V=\frac{36.9atm.L}{3.75atm}=9.84L$

So, the approximate volume is 9.84 L.

$V=9.84L$

Have a nice day!

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4 years ago

During nuclear fusion on a protostar, ___ fuse to form helium atoms

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During nuclear fusion on a protostar, _hydrogen__ fuse to form helium atoms

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4 years ago

Potential Energy can be calculated using PE = mgh, and Kinetic Energy can be calculated using KE = ½mv².

yKpoI14uk [10]

<em>Answer:</em>

<em>hemists divide energy into two classes. Kinetic energy is energy possessed by an object in motion. The earth revolving around the sun, you walking down the street, and molecules moving in space all have kinetic energy. </em>

<em> </em>

<em>Kinetic energy is directly proportional to the mass of the object and to the square of its velocity: K.E. = 1/2 m v2. If the mass has units of kilograms and the velocity of meters per second, the kinetic energy has units of kilograms-meters squared per second squared. Kinetic energy is usually measured in units of Joules (J); one Joule is equal to 1 kg m2 / s2. </em>

<em> </em>

<em> Calculate the kinetic energy in Joules possessed by each of the following objects. Remember to use the correct number of significant figures in your answer. </em>

<em> </em>

<em>A. A 500 g wooden block moving at 2 m/s. </em>

<em>J </em>

<em>B. A 71 kg man walking at 1.0 m/s. </em>

<em>J </em>

<em>C. A 71 kg man running at 5.0 m/s. </em>

<em>J </em>

<em>D. A 1816 kg car (2 tons) travelling at 26.8 m/s (60 mph). </em>

<em>J </em>

<em> </em>

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<em> </em>

<em>The formula for potential energy depends on the force acting on the two objects. For the gravitational force the formula is P.E. = mgh, where m is the mass in kilograms, g is the acceleration due to gravity (9.8 m / s2 at the surface of the earth) and h is the height in meters. Notice that gravitational potential energy has the same units as kinetic energy, kg m2 / s2. In fact, all energy has the same units, kg m2 / s2, and is measured using the unit Joule (J).</em>

<em>Explanation:</em>

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3 years ago