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3 years ago

What mass (in mg) does 2.63 moles of nickel have?

2 answers:

8 0

1 mole Ni = 58.6934g 1g = 1000mg 2.63mol Ni x 58.6934g Ni/mol = 154g Ni 154g <span>Ni x 1000mg/g = 154000mg Ni

Hope this helps! :) </span>

luda_lava [24]3 years ago

3 0

Answer : The mass of nickel have, 15435.47 mg.

Solution : Given,

Moles of nickel = 2.63 moles

Molar mass of nickel = 58.69 g/mole

Formula used :

$\text{Mass of Ni}=\text{Moles of Ni}\times \text{Molar mass of Ni}$

$\text{Mass of Ni}=(2.63mole)\times (58.69g/mole)=154.3547g=15435.47mg$

(1 g = 1000 mg)

Therefore, the mass of nickel have, 15435.47 mg.

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A piece of charcoal is found to contain

Naddika [18.5K]

Answer: The tree died 9709.46 years before.

Explanation:

Expression for rate law for first order kinetics is given by:

$t=\frac{2.303}{k}\log\frac{a}{a-x}$

where,

k = rate constant

t = age of sample

a = let initial amount of the reactant = 100

a - x = amount left after decay process = $\frac{30}{100}\times 100=30$

a) to find rate constant

Half life is the amount of time taken by a radioactive material to decay to half of its original value.

$t_{\frac{1}{2}}=\frac{0.693}{k}$

$k=\frac{0.693}{5600years}=1.24\times 10^{-4}years^{-1}$

b) to know the age

$t=\frac{2.303}{1.24\times 10^{-4}}\log\frac{100}{30}$

$t=9709.46years$

The tree died 9709.46 years before.

8 0

3 years ago

a chemical spill gets into the soil and effects the plants within a forested ecosystem. explain why the top predators would be m

notka56 [123]

Well if we think about a food pyramid there are consumers that eat plants and if there are no plants to eat then those primary consumers die. Which means that the secondary consumers have no prey to eat and die as well, eventually leading to the top predators who have absolutely nothing to feed on.
They are the most affected because energy level decreases the higher up you go so the top predators need to eat more and if there is less and less to eat they die out quicker

3 0

3 years ago

How many moles are in 1.806 x 1024 molecules of bromine?

Pepsi [2]

<h3>Answer:</h3>

2.999 mol Br

<h3>General Formulas and Concepts:</h3>

<u>Math</u>

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction

Left to Right

<u>Chemistry</u>

<u>Atomic Structure</u>

Using Dimensional Analysis
Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.

<h3>Explanation:</h3>

<u>Step 1: Define</u>

1.806 × 10²⁴ molecules Br

<u>Step 2: Identify Conversions</u>

Avogadro's Number

<u>Step 3: Convert</u>

<u /> $\displaystyle 1.806 \cdot 10^{24} \ molecules \ Br(\frac{1 \ mol \ Br}{6.022 \cdot 10^{23} \ molecules \ Br} )$ = 2.999 mol Br

<u>Step 4: Check</u>

<em>We are given 4 sig figs. Follow sig fig rules and round.</em>

Our final answer is already in 4 sig figs, so there is no need to round.

7 0

3 years ago

Read 2 more answers

According to the periodic table of the elements, which set of elements has similar properties?

erma4kov [3.2K]

In chemistry, "chemical properties" of elements usually refers to the electron affinity of an atom (number of valence electrons) This is because atoms with the same number of valence electrons will form similar compounds with other atoms, and undergo the same types of reactions.

Out of this list: He, Ne and Ar are all group 18 elements (Noble gases)
Therefore they have similar chemical properties.

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3 years ago

I need help on the question about chemistry

lapo4ka [179]

Answer:

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Explanation:

If my calculations are right.

there are 44.0 moles in co2
+20.0
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there are 78.125 moles in O2 so just subtract it by 64 which gives you
14.125

MOLE CALCULATION

divide the mass of the material by its molar mass. The molar mass of a substance is the mass in grams of one mole of that substance.

8 0

3 years ago