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3 years ago

Help it is due tomorrow

Chemistry

2 answers:

tresset_1 [31]3 years ago

7 0

There are 2 H atoms shown using the subscript and 1 Mg atom because the is no subscript in total there are 5 added all together.

Anon25 [30]3 years ago

4 0

Answer:

2 H atoms

1 Mg

5 total atoms

Explanation:

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Calculate the formula mass of calcium iodate, ca(io3)2, in atomic mass units (amu or u).

VARVARA [1.3K]

<span>389.88094 amu First we look up the atomic mass of all elements contained in calcium iodate using the periodic table: Ca: 40.078 I: 126.90447 O: 15.999 As an intermediate step we calculate the molecular mass of the ion IO3: 126.90447 + 3*15.999 = 174.90147 Then we calculate the mass of one calcium atom and 2 iodate ions: 2*174.90147 + 40.078 = 389.88094 amu</span>

7 0

3 years ago

How many moles in 2.21 x10E24 atoms of aluminum

lisov135 [29]

<h3>Answer:</h3>

3.67 mol Al

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

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction

Left to Right<u> </u>

<u>Chemistry</u>

<u>Atomic Structure</u>

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

<u>Stoichiometry</u>

Using Dimensional Analysis

<h3>Explanation:</h3>

<u>Step 1: Define</u>

2.21 × 10²⁴ atoms Al

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

Avogadro's Number

<u>Step 3: Convert</u>

Set up: $\displaystyle 2.21 \cdot 10^{24} \ atoms \ Al(\frac{1 \ mol \ Al}{6.022 \cdot 10^{23} \ atoms \ Al})$
Divide: $\displaystyle 3.66988 \ mol \ Al$

<u>Step 4: Check</u>

<em>Follow sig fig rules and round. We are given 3 sig figs.</em>

3.66988 mol Al ≈ 3.67 mol Al

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3 years ago

Which gas is the most abundant greenhouse gas?

tamaranim1 [39]

The most abundant greenhouse gas is water vapor.

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3 years ago

Where would (aq) (s) go in Cr(NO3)3+K3PO4

Ivenika [448]

Answer:

Cr(NO3)3 (aq) +K3PO4 (s)

Explanation:

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3 years ago

Percent yield of 0.20 g of Al

elena-14-01-66 [18.8K]

Answer:

the dividend yield is 4%

Explanation:

The computation of the dividend yield is as follows:

Dividend yield = Dividend per share ÷ current share price per share

= ($0.20 × 4 quarters) ÷ $20

= $0.80 ÷ $0.20

= 4%

hence, the dividend yield is 4%

The same is determined by applying the above formula

7 0

3 years ago

Help it is due tomorrow ​

Help it is due tomorrow