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bogdanovich [222]
3 years ago
5

Express the following numbers as standard form: a) 1.52 x 10^-2 b) 7.78 x 10^-8

Chemistry
1 answer:
Vikentia [17]3 years ago
4 0

Answer:

0.0152

0.0000000778

Explanation:

You just need to more the decimal as many times as the exponent to the to the left if it is negativa and to the right if it is positive.

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The answer is:

Nanometer
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Which colorless and odorless gas, produced by radioactive decay of uranium-238, is considered to be a form of pollution?
Zina [86]
After doing research, it's Radon.
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If this pattern of change in the allele frequencies continued over several more generations, what might eventually happen to the
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The frequency of each allele will be prononced and more evident in each offspring

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5 0
3 years ago
If you started with 35.0 grams of H2S and 40.0 grams of O2, how many grams of S8 would be produced, assuming 95 % yield? 8H2S(g)
Vesnalui [34]
Molar mass

H2S = 34.0 g/mol
O2 = 31.99 g/mol
S8 = 256.52 g/mol

Identifying excess reagent and the limiting of the reaction :

8 H2S(g) + 4 O2(g) = S8(I) +  8 H2O(g)

8 x 34 g H2S -------->  256. 52 g S8
35.0 g ----------------> ??

35.0 x 256.52 / 8 x 34 =

8978.2 / 272 => 33.00 g of S8  

H2S is  the  limiting reactant
---------------------------------------------

4 x 31.99 g O2 --------------- 256.52 g S8
40.0 g O2 --------------------- ??

40.0 x 256.52 / 4 x 31.99 =

10260.8 / 127.96 = 80.16 g of S8  

O2 is the excess reagent is the excess <span>reagent
</span>
------------------------------------------------------------

H2S is the limiting reactant, one that is fully consumed, it is he who determines the mass of S8 produced 

33.0 g ----------- 100%
?? g ------------- 95 %

95 x 33.00 / 100 => 31.35 g

hope this helps!


4 0
2 years ago
How many atoms is 50 g of He?
tigry1 [53]
Atomic <span>mass He = 4.002 u.m.a

4.002 g --------------- 6.02x10</span>²³ atoms
50 g ------------------ ? atoms

50 x ( 6.02x10²³) / 4.002

= 3.01x10²⁵ / 4.002

= 7.52x10²⁴ atoms of He
6 0
3 years ago
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