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vovangra [49]
4 years ago
7

Acetylene torches are used for welding, but the thermite reaction can be useful in situations in which acetylene torches are ina

ppropriate, such as welding underwater. The thermite reaction is described by the equation below: limiting and excess reactants A welder has 1.873 × 102 g Fe2O3 and 94.51 g Al in his welding kit. Which reactant will he run out of first?
Chemistry
2 answers:
FromTheMoon [43]4 years ago
7 0

Acetylene torches are used for welding, but the thermite reaction can be useful in situations in which acetylene torches are inappropriate, such as welding underwater. The thermite reaction is described by the equation below: limiting and excess reactants A welder has 1.873 × 102 g Fe2O3 and 94.51 g Al in his welding kit. Which reactant will he run out of first?=Fe2O3, How much of this reactant should he order to make sure he runs out of both reactants at the same time? Round to the nearest hundredth and do not round any of your work until the very end.He should order =92.41 g of the limiting reactant.

spayn [35]4 years ago
3 0

Fe 203....pathways ..........

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PLS HELP - How many moles are present in 3.01 x 1023 atoms of N2 (nitrogen gas) ?
Neporo4naja [7]

Answer:

<h2>0.5 moles</h2>

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

n =  \frac{N}{L} \\

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

n =  \frac{3.01 \times  {10}^{23} }{6.02 \times  {10}^{23} }  =  \frac{3.01}{6.02}  = 0.5 \\

We have the final answer as

<h3>0.5 moles </h3>

Hope this helps you

6 0
3 years ago
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mariarad [96]

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4 0
3 years ago
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Which best explains why water is able to “stick” to the side of glass?
Bumek [7]
<span>The correct answer is because there are strong adhesive forces exist between glass and the water molecules. They're not as strong as let's say glue or similar adhesives, but are good and water connected to glass has bigger adhesivity then if it was inside of a wooden cup for example or a bowl.</span>
7 0
3 years ago
Given that the concentration of myosin is 25pmol·L−1 and Rmax(Vmax)=208pmol·L−1·s−1 , determine the turnover number of the enzym
DedPeter [7]

Answer:

8.32 s⁻¹

Explanation:

Given that:

The concentration of myosin = 25 pmol/L

R_max = 208 pmol/L/s

The objective is to determine the  turnover number of the enzyme molecule myosin, which has a single active site.

In a single active site of enzyme is known to be a region where there is binding of between substrate molecules, thereafter undergoing chemical reaction.

The turnover number of the enzyme is said to be the number of these substrate molecule which binds together are being converted into products.

The turnover number of the enzyme molecule of myosin can be calculated by the expression: \dfrac{R_{max}}{concentration}

⇒ \dfrac{208 pmol/L/s}{25 pmol/L}

= 8.32 s⁻¹

4 0
4 years ago
What can be different between products and reactants in a balanced equation?
timama [110]

Answer:

b) The total moles of each element present in the reactants and in the products.

Explanation:

Hello there!

In this case, since the law of conservation of mass is used to realize that the mass, atoms and molecules of all the species involved in a chemical reaction must be the same at both reactants and products, we can see that a and c stand for those that must be equal; thus, we infer that the moles can be different as they stand for the amount of substance which is related to the mass via molar masses. Therefore, the answer would be b) The total moles of each element present in the reactants and in the products.

Regards!

8 0
3 years ago
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