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4 years ago

Luke can paint 91 portraits in 7 weeks. How many portraits can Luke paint in 4 weeks?7

Chemistry

1 answer:

Arada [10]4 years ago

6 0

91/7 ?/4. 91×4 is 364 divided by 7 is 52. The answer is 52

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A particular brand of gasoline has a density of 0.737 g/ml at 25 ∘c. how many grams of this gasoline would fill a 13.0 gal tank

Usimov [2.4K]

Density of gasoline is 0.737 g/mL and volume of tank is 13.0 gal.

Since, 1 US gal=3.78 L

Volume of tank in L will be:

$V=13.0 gal(\frac{3.78 L}{1 gal})=49.14 L$

Also, 1 L=1000 mL

Thus,

$V=49.14 L(\frac{1000 mL}{1 L})=49140 mL$

Mass of gasoline can be calculated as follows:

m=d×V

Here, d is density and V is volume thus,

$m=0.737 g/mL\times 49140 mL=3.62\times 10^{4}g$

Therefore, mass of gasoline will be $3.62\times 10^{4}g$ .

7 0

3 years ago

Please help me with this question.

Norma-Jean [14]

Answer:

B or c

Explanation:

It might bee

6 0

3 years ago

Use trends in the periodic table to predict the intensity of the following reactions. Match the letter of each reaction to the p

Shtirlitz [24]

We can use the reactivity series of metals to solve this.

The reactivity series of metals are (in descending order) :
Potassium, sodium, Lithium, calcium, Magnesium, aluminum, zinc, iron, tin, lead, copper, mercury, silver, platinum, gold.

Since Potassium is the most reactive, the reaction with water should produce extremely violent gas.

Sodium is the next most reactive, so it should produce violent gas.

And Lithium is the least reactive out of the 3 metals, so it should be strong gas formation.

In addition, the gas produced should be hydrogen, since the reaction of metals should water should produce "metal name" hydroxide + hydrogen.

4 0

4 years ago

How many atoms are in 187 g of Calcium?

N76 [4]

Atomic mass Calcium ( Ca) = 40.078 u.m.a

40.078 g --------------- 6.02x10²³ atoms
187 g ------------------- ??

187 x ( 6.02x10²³) / 40.078 =

1.125x10²⁶ / 40.078 = 2.808x10²⁴ atoms

hope this helps!

4 0

4 years ago

A chemist prepares a solution of sodium chloride by measuring out of sodium chloride into a volumetric flask and filling the fla

Mkey [24]

Answer:

4.35 mol/L

Explanation:

There is some info missing. I think this is the original question.

<em>A chemist prepares a solution of sodium chloride by measuring out 25.4 grams of sodium chloride into a 100 mL volumetric flask and filling the flask to the mark with water. Calculate the concentration in mol/L of the chemist's sodium chloride solution. Be sure your answer has the correct number of significant digits.</em>

<em />

Step 1: Calculate the moles of sodium chloride

The molar mass of sodium chloride is 58.44 g/mol. The moles corresponding to 25.4 grams of sodium chloride are:

$25.4g \times \frac{1mol}{58.44g} = 0.435mol$

Step 2: Calculate the liters of solution

We will use the relationship 1 L = 1,000 mL.

$100mL \times \frac{1L}{1,000mL} = 0.100L$

Step 3: Calculate the concentration of sodium chloride in mol/L

$\frac{0.435mol}{0.100L} =4.35 mol/L$

6 0

3 years ago