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3 years ago

How do chemicals affect our lives?

2 answers:

8 0

Answer:Human exposure to hazardous chemicals can occur at the source or the chemical could move to a place where people can come into contact with it. Chemicals can move through air, soil, and water. They can also be on plants or animals, and can get into the air we breathe, the food we eat and the water we drink.

Explanation:

alexdok [17]3 years ago

6 0

A. I believe so your welcome

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Determine the limiting reactant when 30.0 g of propane, C3H8, is burned with 75.0 g of oxygen.

AnnZ [28]

Answer: The limiting reagent is oxygen gas.

Explanation:

Limiting reagent is defined as the reactant that is present in less amount and it limits the formation of products.

Excess reagent is defined as the reactant which is present in large amount.

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$ .....(1)

For propane:

Given mass of propane = 30.0 g

Molar mass of propane = 44.1 g/mol

Putting values in equation 1, we get:

$\text{Moles of propane}=\frac{30.0g}{44.1g/mol}=0.680mol$

For oxygen:

Given mass of oxygen = 75.0 g

Molar mass of oxygen = 32 g/mol

Putting values in equation 1, we get:

$\text{Moles of propane}=\frac{75.0g}{32g/mol}=2.34mol$

The chemical equation for the combustion of propane follows:

$C_3H_8(g)+5O_2(g)\rightarrow 3CO_2(g)+4H_2O(l)$

By Stoichiometry of the reaction:

5 moles of oxygen gas reacts with 1 mole of propane.

So, 2.34 moles of oxygen gas will react with = $\frac{1}{5}\times 2.34=0.468mol$ of propane

As, given amount of propane is more than the required amount. So, it is considered as an excess reagent.

Thus, oxygen is considered as a limiting reagent because it limits the formation of product.

Hence, the limiting reagent is oxygen gas.

3 0

3 years ago

Mr. Gordon's science students are studying scale models of the Sun-Earth-Moon system. Mr. Gordon is using this model to show his

Nata [24]

Answer:

It's very likely

Explanation: UwU

3 0

3 years ago

Read 2 more answers

Using the HH eq. calculate the amounts (masses) of sodium phosphate monobasic monohydrate (NaH2PO4 H2O) and sodium phosphate dib

pishuonlain [190]

Drop out my dude whatever this is ain’t worth it

4 0

3 years ago

4. To how much water should 50 mL of 12 M hydrochloric acid be added to

Novosadov [1.4K]

Answer : The volume of water added are, 15 mL

Explanation :

Formula used :

$M_1V_1=M_2V_2$

where,

$M_1\text{ and }V_1$ are the initial molarity and volume of HCl.

$M_2\text{ and }V_2$ are the final molarity and volume of water.

We are given:

$M_1=12M\\V_1=50mL\\M_2=40M\\V_2=?$

Putting values in above equation, we get:

$12M\times 50mL=40M\times V_2\\\\V_2=15mL$

Hence, the volume of water added are, 15 mL

7 0

3 years ago

What happens when you put the wrong chemicals together.?

Gre4nikov [31]

When putting two of the wrong chemicals together it may cause a reaction that is different from what the experiment was meant to be, or nothing could happen.

Hope this helps!! :)

7 0

4 years ago