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3 years ago

The__________of an element is the average mass of all isotopes of that element.

Chemistry

2 answers:

Snowcat [4.5K]3 years ago

8 0

Relative atomic mass

timofeeve [1]3 years ago

3 0

The answer would be Atomic Mass I believe. Hope this helps!

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Solid lithium hydroxide is used to "scrub" CO2 from the air inspacecraft and submarines; it reacts with the CO2 to produce lithi

ArbitrLikvidat [17]

Answer:

223 L

Explanation:

Step 1: Write the balanced equation.

2 LiOH + CO₂ = Li₂CO₃ + H₂O

Step 2: Calculate the moles corresponding to 440 g of LiOH

The molar mass of LiOH is 23.95 g/mol.

440 g × (1 mol/23.95 g) = 18.4 mol

Step 3: Calculate the moles of CO₂ that react with 18.4 moles of LiOH

The molar ratio of LiOH to CO₂ is 2:1. The reacting moles of CO₂ are 1/2 × 18.4 mol = 9.20 mol.

Step 4: Convert 20°C to Kelvin

K = °C + 273.15 = 20 + 273.15 = 293 K

Step 5: Convert 753 torr to atm

753 torr × (1 atm/760 torr) = 0.991 atm

Step 6: Calculate the volume of CO₂

We will use the ideal gas equation.

P × V = n × R × T

V = n × R × T / P

V = 9.20 mol × (0.0821 atm.L/mol.K) × 293 K / 0.991 atm

V = 223 L

7 0

3 years ago

Making a pancake from batter is an example of blank change

lesantik [10]

Answer is: chemical.

Making a pancake from batter is chemical change (chemical reaction), because new substances are formed, the atoms are rearranged and the reaction is followed by an energy change.

Batter is thin dough that is poured into a pan to make pancakes.

In physical change, the same substance is present before and after the psysical change, just with different form or state of matter.

8 0

3 years ago

Read 2 more answers

Find the molarity of the following solution:

CaHeK987 [17]

Answer:

2.67 M

Explanation:

Molarity, which is the molar concentration of a substance, can be calculated using the formula;

M = n/V

Where;

M = molarity (M)

n = number of moles (mol)

V = volume (Litres)

Based on the provided information in this question, mass of lithium sulfate (Li2SO4) = 734g, volume = 2.5L

Using mole = mass/molar mass

Molar mass of Li2SO4 = 7(2) + 32 + 16(4)

= 14 + 32 + 64

= 110g/mol

Mole = 734/110

Mole (n) = 6.67moles

Molarity = n/V

Molarity = 6.67/2.5

Molarity = 2.668

Molarity of Li2SO4 in the solution is 2.67 M

5 0

3 years ago

Read 2 more answers

If 14 moles of Oxygen burn how many moles of water are created? *

andrey2020 [161]

Answer:

A) 12 mol H2O.

Explanation:

Hello,

In this case, for the given reaction:

$2C_2H_6+7O_2\rightarrow 4CO_2 + 6 H_2O$

We notice that oxygen is in a 7:6 molar relationship with water, for that reason, the resulting moles of water turn out:

$n_{H_2O}=14molO_2*\frac{6molH_2O}{7molO_2} \\\\n_{H_2O}=12molH_2O$

Thus, the answer is A) 12 mol H2O.

Best regards.

6 0

3 years ago

How does reproduction leads to natural selection in a population

Advocard [28]

Natural selection requires variation between individuals. Mutations and reproduction increase genetic variation in a population. Natural selection occurs when environmental pressures favor certain traits that are passed on to offspring.

6 0

3 years ago