<span>a date expressed in specific units of scientific measurement such as days, years, centuries, or millennia.
For example-</span><span>Dendrochronology (used to date burials)</span>
Complete Question:
An iron atom has a mass of 9.27*(10)⁻²³ g and a cooking pot has a mass of 0.500 kg.
Use this information to answer the questions below:
1) What is the mass of 1 mole of iron atoms? Round your answer to 3 significant digits.
The mass of 1 mole of iron atoms is 55.8 g
Why?
The key to solve this question is the use of the Avogadro's Number (NA). This number tells us the amount of atoms found in 1 mole of a substance. So, to find the mass of 1 mole of iron atoms, we're actually finding the mass of 6.022 x 10²³ atoms.
The equation we are going to use to find the mass is shown below:
2) How many moles of iron atoms have a mass equal to the mass of a cooking pot? Round your answer to 3 significant digits.
The moles of iron atoms that have a mass equal to the mass of a cooking pot is 8.96 moles
Why?
In this case, we are also going to use the mass of the cooking pot. We have to find first how many atoms are there in the cooking pot, and then we will find how many moles are represented by that mole of atoms:
Atoms in the cooking pot:
Moles in the cooking pot:
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Answer:
C, 3.00 moles
Explanation:
First, balance the equation.
4Al + 3O2 ---> 2Al2O3
From the balanced equation, assuming Al is limiting, the mole ratio of Al:Al2O3 = 4:2 = 2:1,
meaning every 2 moles of Al used, produces 1 mole of Al2O3.
So, since 1.5 moles of Al2O3 is produced,
the no. of moles of Al used = 1.5 x2
= 3.0 moles
= C
Answer:
0.178M
Explanation:
The question can immediately be understood as comparing two states.
- The initial state M1 , V1.
- The Final state M2 , V2.
M - Molarity.
V - Volume (in mili liters/ml/ in this case).
The formula is stated as:
M1 * V1 = M2 * V2
Given- Required
M1 = 0.125M V1 = 265ml M2 = ?
V2 = 186ml
- Plug these values into the formula above and divide V2 to get M2.
rearranged formula - M2 = M1 * V1 / V2 = 0.125M * 265ml / 186ml
= 0.178091397 M ~ ~ 0.178M.