4 years ago

What do engineers use to test their designs of new technologies?

Chemistry

2 answers:

Alchen [17]4 years ago

6 0

B. models is the answer

erica [24]4 years ago

4 0

The answer Fam is B) Models

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A 1.000-g sample of lead shot reacted with oxygen to give 1.077 g of product. Calculate the empirical formula of the lead oxide

Evgesh-ka [11]

It mean it consisted of 1 g of lead and 0.077 g of O2.
divide these numbers by molar mas.
1/82=0.012 Pb /0.004 = 3
0.077/16= 0.004 O /0.004 =1
Pb3O

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3 years ago

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What is the mass of 19.5 moles of carbon dioxide?

Olenka [21]

Explanation:

mass = moles * molar mass

molar mass of carbon dioxide (CO2) = 12+32 = 44

= 19.5* 44 = 858

proof

moles = mass /molar mass

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3 years ago

135 grams of sodium has ______ moles.<br><br> (Enter just the number for this one.)

just olya [345]

Answer : 135 grams of sodium has 5.869 moles.

Solution : Given,

Mass of sodium = 135 grams

Molar mass of sodium = 23 g/mole

Formula used :

$\text{Moles of sodium}=\frac{\text{Mass of sodium}}{\text{Molar mass of sodium}}$

Now put all the given values in this formula, we get

$\text{Moles of sodium}=\frac{135g}{23g/mole}=5.869moles$

Therefore, the moles of sodium present in 135 grams of sodium is, 5.869 moles.

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How many electrons are in the 3p sublevel of Sulfur?

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There are FOUR electrons in the 3p sub-level of sulfur....

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Colt1911 [192]

It changes the rate of growth that cells usually undergo.

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