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Gemiola [76]
3 years ago
12

Sean has trouble remembering all the geometry formulas. What can he do to make sure he doesn’t forget there formulas during his

test?
Chemistry
1 answer:
GaryK [48]3 years ago
7 0

Answer:

3.write the formulas somewhere on his test when he gets it

Explanation:

Some people may have problems memorizing a large number of formulas, especially those that have to do with science. In addition to the fact that there are many tips that people can use when memorizing these formulas, one of those tips is to write the formulas somewhere in the exam when they have it, so Sean will have the list of formulas on hand when you need them to use in your exam.

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How many hydrogen atoms in 5 H2O?
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Answer:

D

B

B not sure sorry

C

Compound

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How many grams of hydrochloric acid will react completely with a block of gold is 3.2 cm by 3.8 cm by 2.8 cm, if the density of
JulijaS [17]
Answer:
mass of HCl = 243.5426 grams

Explanation:
1- we will get the mass of the reacting gold:
volume of gold = length * width * height
volume of gold = 3.2 * 3.8 * 2.8 = 34.048 cm^3 = 34.048 ml<span>
density = mass / volume
Therefore:
mass = density * volume
mass of gold = </span>19.3 * 34.048 = 657.1264 grams

2- we will get the number of moles of the reacting gold:
number of moles = mass / molar mass
number of moles = 657.1264 / 196.96657 
number of moles = 3.3362 moles

3- we will get the number of moles of the HCl:
First, we will balanced the given equation. The balanced equation will be as follows:
Au + 2HCl ......> AuCl2 + H2
This means that one mole of Au reacts with 2 moles of HCl.
Therefore 3.3362 moles will react with 2*3.3362 = 6.6724 moles of HCL

4- we will get the mass of the HCl:
From the periodic table:
molar mass of H = 1 gram
molar mass of Cl = 35.5 grams
Therefore:
molar mass of HCl = 1 + 35.5 = 36.5 grams/mole
number of moles = mass / molar mass
Therefore:
mass = number of moles * molar mass
mass of HCl = 6.6724 * 36.5
mass of HCl = 243.5426 grams

Hope this helps :)
4 0
3 years ago
2. Al + Fe2O3 → Al2O3 + Fe (Need to balance equation)
shtirl [24]
Balanced equation: 2Al+Fe2O3–> Al2O3+2Fe

Using mole calculations you can find that 10g of Al produces 24.3g of Fe under the conditions described
4 0
3 years ago
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