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4 years ago

Comets are called “dirty snowballs” because of their frozen, icy state. True or False?

Chemistry

2 answers:

Wewaii [24]4 years ago

6 0

The answer is TRUE, comets are big ice balls

SCORPION-xisa [38]4 years ago

5 0

Comets are not states but true .... remember this comets clean things that are dirty

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Lithium has two stable isotopes with masses of 6.01512 amu and 7.01600 amu. The average molar mass of Li is 6.941 amu. What is t

Dvinal [7]

Answer : The percent abundance of Li isotope-1 and Li isotope-2 is, 6.94 % and 93.1 % respectively.

Explanation :

Average atomic mass of an element is defined as the sum of masses of each isotope each multiplied by their natural fractional abundance.

Formula used to calculate average atomic mass follows:

$\text{Average atomic mass }=\sum_{i=1}^n\text{(Atomic mass of an isotopes)}_i\times \text{(Fractional abundance})_i$ .....(1)

Let the fractional abundance of Li isotope-1 be 'x' and the fractional abundance of Li isotope-2 will be '100-x'

For Li isotope-1 :

Mass of Li isotope-1 = 6.01512 amu

Fractional abundance of Li isotope-1 = x

For Li isotope-2 :

Mass of Li isotope-2 = 7.01600 amu

Fractional abundance of Li isotope-2 = 100-x

Average atomic mass of Li = 6.941 amu

Putting values in equation 1, we get:

$6.941=[(6.01512\times x)+(7.01600\times (100-x))]$

By solving the term 'x', we get:

$x=694.048$

Percent abundance of Li isotope-1 = $\frac{694.048}{100}=6.94\%$

Percent abundance of Li isotope-2 = 100 - x = 100-6.94 = 93.1 %

6 0

3 years ago

How many moles of phosphine (PH3) are produced for every 4.0 moles of hydrogen that react according to the chemical equation bel

Mariana [72]

Answer: 2.67 moles of Phosphine are produced

Explanation:

From the equation 3H2 + P2 → 2PH3

3 moles of hydrogen (H2) = 2 moles of Phosphine (PH3)

4 moles of hydrogen = X moles of PH3

Then, cross multiply

X moles of Phosphine = (4 x 2) / 3

= 8 / 3

= 2.67 moles

Thus, 4 moles of hydrogen produces 2.67 moles of Phosphine

7 0

3 years ago

why does an aluminum horseshoe bend but not break when a blacksmith pounds it into shape with a hammer?

riadik2000 [5.3K]

Answer:

it's because aluminium is a ductile material

8 0

3 years ago

Write a balanced chemical equation describing the reaction of zinc and hydrochloric acid.

erastova [34]

The chemical formula for zinc is Zn, and HCl for hydrogen chloride. The complete balanced equation for these reactants would be:

Zn + 2 HCl → ZnCl₂ + H₂

The stoichiometric coefficient 2 for HCl is essential to obey the Law of Conservation of Mass. The elements before and after the reaction must be equal in amounts.

5 0

4 years ago

Read 2 more answers

What happens when gasoline is used to power a vehicle?

olga55 [171]

Well cars need gas to run on if the car does not have gas it wont run and you cant get to places you need to go only if you have gas.

5 0

3 years ago