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3 years ago

Look at the reaction below. Which substance is the base in the reaction? 2H2O (l) H2SO4 (aq) CaSO4 (aq) Ca(OH)2 (aq)

Chemistry

1 answer:

dsp733 years ago

6 0

Ca(OH)2 (aq) because of elements oxygen and hydrogen

Ca(OH)2(aq)+H2SO4(aq)—→ CaSO4(s)+ 2H2O(l)

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Radioactive elements decay via first-order kinetics. consider a certain type of nucleus that has a rate constant of 2.4 × 10–2 h

Leokris [45]

Answer:

37.15 h.

Explanation:

The decay of radioactive elements obeys first-order kinetics.

For first-order reaction: kt = lna/(a-x).

where, k is the rate constant of the reaction (k = 2.4 x 10⁻² h⁻¹).

t is the time of the reaction (t = ??? day).

a is the initial concentration of nuclides (a = 100 %).

(a-x) is the remaining concentration of nuclides (a - x = 100% - 59% = 41.0 %).

∴ kt = lna/(a-x)

(2.4 x 10⁻² h⁻¹)(t) = ln(100.0%)/(41.0%).

(2.4 x 10⁻² h⁻¹)(t) = 0.8916.

∴ t = (0.8916)/(2.4 x 10⁻² h⁻¹) = 37.15 h.

6 0

3 years ago

In which group do all atoms have seven valence electrons in the ground state?

SpyIntel [72]

Hence they got seven electrons in ground state

8 0

3 years ago

How many neutrons does 3919K have?

Igoryamba

19 protons and 19 electrons but neutrons are vary

5 0

3 years ago

How many moles of glucose does 1.2 x 10^24 molecules represent

sammy [17]

<h3>Answer:</h3>

2.0 mol C₆H₁₂O₆

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

Math

Pre-Algebra

Order of Operations: BPEMDAS

Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction

Left to Right

Chemistry

Atomic Structure

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

Stoichiometry

Using Dimensional Analysis

<h3>Explanation:</h3>

Step 1: Define

1.2 × 10²⁴ molecules C₆H₁₂O₆ (glucose)

Step 2: Identify Conversions

Avogadro's Number

Step 3: Convert

Set up: $\displaystyle 1.2 \cdot 10^{24} \ molecules \ C_6H_{12}O_6(\frac{1 \ mol \ C_6H_{12}O_6}{6.022 \cdot 10^{23} \ molecules \ C_6H_{12}O_6})$
Divide: $\displaystyle 1.99269 \ mol \ C_6H_{12}O_6$

Step 4: Check

Follow sig fig rules and round. We are given 2 sig figs.

1.99269 mol C₆H₁₂O₆ ≈ 2.0 mol C₆H₁₂O₆

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4 years ago

How would you name the number:100 liters?

erastovalidia [21]

Answer:

Explanation:

7 0

3 years ago