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3 years ago

15

Aluminum has a density of 2.70g/cm what is the volume occupied by a block of aluminum which weights 4.32kg

1 answer:

romanna [79]3 years ago

4 0

Answer:

Explanation:

0.000625 cm3

0.625 cm3

1.60 cm3

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Which of the following statements describes an interaction between the geosphere and biosphere?

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A.soil acidity affects plant growth
The soil comes from land that makes up the geosphere and plants living things that belong in the biosphere.

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Mercury can be obtained by reacting mercury(ii) sulfide with calcium oxide. how many grams of calcium oxide are needed to produc

Lelechka [254]

Reaction between mercury (ii) sulfide with Calcium oxide is as shown;
4 HgS +4 CaO = 4 Hg + 3 CaS + CaSO4
The molar mass of HgS is 232.66 g/mol
The number of moles = 31.28/232.66
= 0.1344 moles
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Thus, the mass of CaO is 56 g/mol
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4.60 mL of 0.1852 M HNO3 is titrated to the phenolphthalein indicator endpoint with 27.35 mL of a KOH solution. What is the mola

Kamila [148]

Answer:

$M_{base}=0.0311M$

Explanation:

Hello there!

In this case, according to the given information, it turns out possible for us to solve for the molarity of the KOH solution by knowing this base react in a 1:1 mole ratio with nitric acid, HNO3; thus, we can write the following equation, as their moles are the same at the endpoint:

$n_{acid}=n_{base}$

Which in terms of molarities and volumes is:

$M_{acid}V_{acid}=M_{base}V_{base}$

Thus, we solve for the molarity of the base (KOH) to obtain:

$M_{base}=\frac{M_{acid}V_{acid}}{V_{base}} \\\\M_{base}=\frac{4.60mL*0.1852M}{27.35mL}\\\\M_{base}=0.0311M$

Regards!

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3 years ago

How many moles are there in 1.505 X 1024 molecules of water, H2O?

KATRIN_1 [288]

Answer:

2.5 moles

Explanation:

Nᴀ=6.02×10²³ (constant)

n=N/Nᴀ=

$= \frac{1.505 \times 10 ^{24} }{ {6.02 \times 10}^{23} } = 2.5 \: moles$

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3 years ago