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xxTIMURxx [149]
3 years ago
6

How did earth come to be spherical

Chemistry
1 answer:
Alex3 years ago
8 0
Gravity. An increase in mass corresponds to an increase in gravity so as asteroids and space Debris kept colliding to make earth the mass increased which increased gravity which pulls everything in from every direction resulting in a spherical shape
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How many moles of phosphoric acid are there in 658 grams of phosphoric acid?
vovangra [49]
<span>The molecular formula for phosphoric acid is H3PO4 and has 97.994 grams per mol. In a sample of 658 grams of phosphoric acid, there are 6.71 mols of phosphoric acid.</span>
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3 years ago
The theoretical yield of a reaction is the amount of product obtained if the limiting reactant is completely converted to produc
Elis [28]

Answer: 9.9 grams

Explanation:

To calculate the moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}

a) moles of H_2

\text{Number of moles}=\frac{8.150g}{2g/mol}=4.08moles

b) moles of C_2H_4

\text{Number of moles}=\frac{9.330g}{28g/mol}=0.33moles

H_2(g)+C_2H_4(g)\rightarrow C_2H_6(g)

According to stoichiometry :

1 mole of C_2H_4 combine with 1 mole of H_2

Thus 0.33 mole of C_2H_4 will combine with =\frac{1}{1}\times 0.33=0.33 mole of H_2

Thus C_2H_4 is the limiting reagent as it limits the formation of product.

As 1 mole of C_2H_4 give =  1 mole of C_2H_6

Thus 0.33 moles of C_2H_4 give =\frac{1}{1}\times 0.33=0.33moles  of C_2H_6

Mass of C_2H_6=moles\times {\text {Molar mass}}=0.33moles\times 30g/mol=9.9g

Thus theoretical yield (g) of C_2H_6 produced by the reaction is 9.9 grams

7 0
3 years ago
What is the molar mass of chromic sulfate, Cr2(SO4)3?
mestny [16]

Answer:

392.16 g/mol

Explanation:

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A piece of work can be finished in 30 days 8 hours a day. In how many Days the work would have been finished working 6 hours a d
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If 8 hours= 30 days

then 6 hours= 8×30÷6

                    = 40 days

Explanation:

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