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3 years ago

7

Which of the following is INCORRECT about

1 answer:

Bas_tet [7]3 years ago

6 0

Answer:umm I think it’s B

Explanation:

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The combustion of propane may be described by the chemical equation C 3 H 8 ( g ) + 5 O 2 ( g ) ⟶ 3 CO 2 ( g ) + 4 H 2 O ( g ) C

Kipish [7]

Answer: 72 grams of $O_2(g)$ are needed to completely burn 19.7 g $C_3H_8(g)$

Explanation:

According to avogadro's law, 1 mole of every substance weighs equal to molecular mass and contains avogadro's number $6.023\times 10^{23}$ of particles.

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

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

Putting in the values we get:

$\text{Number of moles}=\frac{19.7g}{44g/mol}=0.45moles$

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

According to stoichiometry:

1 mole of $C_3H_8$ requires 5 moles of oxygen

0.45 moles of $C_3H_8$ require= $\frac{5}{1}\times 0.45=2.25$ moles of oxygen

Mass of $O_2=moles\times {\text {Molar mass}}=2.25\times 32=72g$

72 grams of $O_2(g)$ are needed to completely burn 19.7 g $C_3H_8(g)$

7 0

3 years ago

A posssible answer to a scientific question is called a

Alekssandra [29.7K]

It is called a hypothesis

5 0

4 years ago

Read 2 more answers

What are the twenty (20) element in the periodic table

Marina CMI [18]

Answer:

calcium (ca)

Explanation:

5 0

3 years ago

helium ballon is filled iwth a volume of 2.88 x 10 to the 3 power at 722 mmHg and 19C. When the ballon is released, it rises to

antiseptic1488 [7]

Answer: The volume of the balloon is $4.58\times 10^3$

Explanation:

Combined gas law is the combination of Boyle's law, Charles's law and Gay-Lussac's law.

The combined gas equation is,

$\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}$

where,

$P_1$ = initial pressure of gas = 722 mm Hg

$P_2$ = final pressure of gas = 339 mm Hg

$V_1$ = initial volume of gas = $2.88\times 10^3$

$V_2$ = final volume of gas = ?

$T_1$ = initial temperature of gas = $19^oC=273+19=292K$

$T_2$ = final temperature of gas = $-55^oC=273-55=218K$

Now put all the given values in the above equation, we get:

$\frac{722\times 2.88\times 10^3}{292}=\frac{339\times V_2}{218}$

$V_2=4.58\times 10^3$

Thus the volume of the balloon is $4.58\times 10^3$

6 0

3 years ago

Which of the following will react with a solution of zinc sulphate fastest ?

lakkis [162]

Answer:

C. Magnesium

Explanation:

Zinc sulphate (ZnSO4) will react fastest with Magnesium (Mg) because magnesium is more reactive than Zinc and other given elements.

Zinc sulphate (ZnSO4) reacts with Magnesium (Mg) and undergo displacement reaction. Zinc is displaced by magnesium and form Magnesium Suphate (ZnSO4).

ZnSO4 + Mg => MgSO4 + Zn

4 0

3 years ago