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3 years ago

What is the mass of one mole of product? (Remember the law of conservation of mass) g

Chemistry

1 answer:

Tems11 [23]3 years ago

6 0

Answer:

To calculate the no. of moles you must know mass and molar mass of the product

Explanation:

no. of moles =mass/molar mass

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Molecules in all organisms are composed in part of radioactive carbon-14. Which statement best explains the presence of carbon-1

lana66690 [7]

Answer:

The correct answer is option b, that is, the radioactive isotope reacts in the same way as stable isotopes in the chemical reactions in the body.

Explanation:

The carbon-14 atoms, which are created by the cosmic rays associates with oxygen to produce carbon dioxide that plants captivate naturally and comprise it into plant fibers by the process of photosynthesis. Afterward, the plants are consumed by animals and human beings, thus, they take in carbon-14 as well.

The ratio of usual carbon-12 to carbon-14 in the air and in all the living species at a particular period is almost the same. These radioactive isotopes react in a similar manner as stable isotopes in the chemical reactions in the body.

7 0

4 years ago

A 250.0 mL sample of air at 100.0 K is warmed to 200.0 k at constant pressure .What is the volume of the air sample at the new t

hoa [83]

Answer:

500.0 mL

Explanation:

From Charles’ Law, we know that

$\frac{V_{1} }{T_{1} }= \frac{V_{2} }{T_{2 }}$

We can solve this equation to get

$V_{2} = V_{1} \times \frac{ T_{2}}{ T_{1}}$

$V_{2} = \text{250.0 mL} \times \frac{\text{200.0 K}}{\text{100.0 K}} = \textbf{500.0 mL}$

8 0

3 years ago

Which apparent motion can be explained by a geocentric model ?

baherus [9]

Answer:

The sun's path through the sky ( i hope this helps)

7 0

3 years ago

Given: 36.7 grams of CaF2 is added to 300 mL water. Find molarity?

BigorU [14]

<h3>Answer:</h3>

2 M

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

Math

Pre-Algebra

Order of Operations: BPEMDAS

Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction

Left to Right

Chemistry

Unit 0

Reading a Periodic Table
Using Dimensional Analysis

Aqueous Solutions

Molarity = moles of solute / liters of solution

<h3>Explanation:</h3>

Step 1: Define

36.7 g CaF₂

300 mL H₂O

Step 2: Identify Conversions

Molar Mass of Ca - 40.08 g/mol

Molar Mass of F - 19.00 g/mol

Molar Mass of CaF₂ - 40.08 + 2(19.00) = 78.08 g/mol

1000 mL = 1 L

Step 3: Convert

Solute

Set up: $\displaystyle 36.7 \ g \ CaF_2(\frac{1 \ mol \ CaF_2}{78.08 \ g \ CaF_2})$
Multiply: $\displaystyle 0.470031 \ mol \ CaF_2$

Solution

Set up: $\displaystyle 300 \ mL \ H_2O(\frac{1 \ L \ H_2O}{1000 \ mL \ H_2O})$
Multiply: $\displaystyle 0.3 \ L \ H_2O$

Step 4: Find Molarity

Substitute [M]: $\displaystyle x \ M = \frac{0.470031 \ mol \ CaF_2}{.3 \ L \ H_2O}$
Divide: $\displaystyle x = 1.56677 \ M$

Step 5: Check

Follow sig fig rules and round. We are given 1 sig fig as our lowest.

1.56677 M ≈ 2 M

8 0

3 years ago

For which of the following measures is Earth's the highest compared to the other planets in our Solar System?

NikAS [45]

Missing question:
a) mass.
b) diameter.
c) distance from the Sun.
d) density.
Answer is: d) density.
Earth has the highest density of all eight planets in the Solar System, density of the Earth is 5.514 g/cm³.
The four inner planets, closest to the Sun, are all terrestrial planets, which means they are composed of silicate rocks and metals and four outer planets are gas giants, they are composed of hydrogen, helium and water.
Earth is third planet from the Sun.

6 0

3 years ago