Answer:
Explanation:
We are asked to convert 1.45 moles of potassium hydroxide (KOH) to grams.
<h3>1. Molar Mass</h3>
The molar mass is the mass in grams of 1 mole of a substance. The values are found on the Periodic Table. They are the same as the atomic masses but the units are grams per mole (g/mol) instead of atomic mass units (amu).
We have the compound KOH. Look up the molar masses of the individual elements.
- Potassium (K): 39.098 g/mol
- Oxygen (O): 15.999 g/mol
- Hydrogen (H): 1.008 g/mol
The formula for the compound has no subscripts, so there is 1 mole of each element in 1 mole of the compound. We can simply add the molar masses.
- KOH: 39.098 + 15.999 + 1.008 =56.105 g/mol
<h3>2. Convert Moles to Grams</h3>
Based on the molar mass, there are 56.105 grams of KOH in 1 mole. Create a ratio using this information.
We are converting 1.45 moles of KOH to grams, so we multiply by this value.
The units of moles of KOH cancel.
<h3>3. Round </h3>
The original measurement of moles has 3 significant figures, so our answer must have the same.
For the number we calculated, that is the tenths place. The 5 in the hundredths place (81.3<u>5</u>225) tells us to round the 3 up to a 4.
<u>Approximately 81.4 grams of potassium hydroxide </u>are represented by 1.45 moles.
Answer:
They cause patterns to vary by latitude, altitude, and geographic land distribution.
Explanation:
Answer:
34.32 oz
Explanation:
1.- The carpet has the dimension 12 x 11 ft, so it has an area = 12 x 11 = 132 ft2
To convert the Ft2 into yd2:
9 ft2 = 1 yd2
132 ft2 = x X = (132 x1) / 9 = 14.6 yd2
2.- By now, it is now that the 39 % is burned, so obtain the 39 % of 14.6 yd2
14.6 yd2 = 100 %
x = 39 % x = (39 x 14.6) / 100 = 5.72 yd2
3.- It is known that 30 oz acrylan /yd2
30 oz = 1 yd2
x = 5.72 yd2 X = (5.72 x 30) /1 = 171.6 oz
4.- It is assume that just the 20 % of the fibers has HCN
171.6 oz = 100 %
x = 20 % X = (20 x 171.6) /100 = 34.32 oz
The answer would be C. CH3COOH, deprotonated