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Doss [256]
3 years ago
11

A loaf of bread has a volume of 700 cm3 and a mass of 420 g. what is the density of the bread?

Chemistry
1 answer:
joja [24]3 years ago
8 0

We know that the equation for density is:

D=\frac{m}{V}

where D is the density, m is the mass in g, and V is the volume in either mL or cubic centimeters.

So then, given two of the variables, we can solve for density:

D=\frac{420g}{700cm^{3}}

D=\frac{0.6g}{cm^{3}}

Therefore, the density of the bread is 0.6g per cubic centimeter.

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how many grams of oxygen are produced if 25.0g of potassium chlorate decomposes according to the reaction 2KCLO3 —-> 2KCL +3O
AveGali [126]

Answer:

approximately 15.1 grams.

Explanation:

The key to chemistry is to change everything to moles. Then when you have the answer in moles change the answer back to grams, liters, or whatever you want.

change 25 grams of potassium chlorate to moles.

calculate the gram molecular mass of potassium chlorate.

Chlorate is Cl with 3 oxygens. ate = saturated. Chlorine has seven valance electrons when it is saturated six of these electrons are used by oxygen ( 2 electrons per oxygen) leaving only 1 electron.

1 K x 39 grams/mole

+1 Cl x 35.4 grams/ mole

+3 O x 16 grams/ mole

= 122.4 grams / mole Potassium Chlorate

25

122.4

= moles.

2.05 moles of Potassium Chlorate.

There is a 1:1 mole ratio. 1 mole of Potassium Chlorate will produce 1 mole of Potassium Chloride.

2.05 moles of Potassium Chlorate will produce 2.05 moles of Potassium Chloride.

Find the gram molecular mass of Potassium Chloride.

1 K x 39 = 39

+1 Cl x 35.4 = 35.4

= 74.4 grams / mole.

2.05 moles x 74.4 grams/ mole = 15.2 grams

Hope it helps :)

6 0
3 years ago
Read 2 more answers
The difference in hydrogen ion concentration between solutions with ph4 and ph5 is
jonny [76]
I think the answer is tenfold

hope this helps :)
4 0
3 years ago
Can someone answer 1-10 for me or the one you know I’ll give you brainlest!!!
Reika [66]
1. Coefficient
2. Subscript
3. Products
4. Reactants
5. Balance
6. Combustion
7. Decomposition
8. Single replacement
9. Double replacement
10. Synthesis
I’m sorry if I’m wrong
5 0
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140000 rounded to 3 sig gigs
attashe74 [19]
1.40E+5 (140000)
I believe this is right
8 0
3 years ago
one molecule of chlorophyll contains 137 atoms. how many of these atoms come from the metal magnesium?
Svetlanka [38]
The chemical formula for chlorophyll is C55H72O5N4<span>Mg. Only 1 of the 137 atoms comes from magnesium.

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7 0
3 years ago
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