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3 years ago

ASAP ASAP

Chemistry

1 answer:

vesna_86 [32]3 years ago

8 0

C7H6O3 + C4H6O3 → C9H8O4 + C2H4O2

Convert the 100g of salicylic acid (SA) into moles and the ratio is 1:1.

Convert moles of aspirin into grams of aspirin where grams = molar mass *moles which is the theoretical yield.Percentage yield =50g (actual yield)* 100

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What are the 3 things that should be remembered while writing a chemical reaction?

stich3 [128]

Answer:

They are as follows:

Complete information about reactants and products, e.g. number of molecules, mass, etc.
Physical states of substances.
Necessary conditions for chemical equation, e.g temperature, pressure, catalyst, etc.
Equation also shows if the reaction is exothermic or endothermic.

Explanation:

I hope it'll help you...

4 0

3 years ago

172 °C = __________ K<br> (Round off to the nearest whole number)

NNADVOKAT [17]

-101, K=C+273 so in this you would subtract 273 from 172

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3 years ago

When the Moon blocks out the Sun in a solar eclipse, we can still see the

Mashutka [201]

We can still see the shadow of the Earth and/or Earth's surface.

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3 years ago

Properties of mixtures

makkiz [27]

Answer:The constituents of the mixture can be separated by physical methods. Boiling point and the melting point of the mixture depends upon the characteristic of the constituents. During the formation of a mixture, there is no change in the energy. All the states of matter (solid, liquid, gases) can combine to form mixtures.

Explanation:

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3 years ago

Question 19 of 25 The atomic number of the element radium is 88. How many neutrons does radium-226 have?

Mazyrski [523]

Answer:

B. 138

Explanation:

Based on isotope notation:

$^X_nA$

For the atom A, the mass number, X, is the sum of neutrons and protons and

n is the number of protons = Atomic number.

The number of protons depends of the nature of the atom. For example, Carbon has 12 protons, hydrogen 1 and <em>Radium has 88 protons.</em>

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The radium-226 means the mass number is 226. Thus, number of neutrons are:

Mass number - Atomic number

226 - 88 = 138

Right answer is:

4 0

3 years ago