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3 years ago

Frank pulls down on a garage door with a force of 80 N. If the door weighs 210 N, what is the net downward force on the door?

Chemistry

2 answers:

elena-s [515]3 years ago

7 0

Answer:

290 N

Explanation:

Total downward force = Force applied on the door in bringing it down + weight of the door

Total downward force = 80 + 210

Total downward force = 290N

oee [108]3 years ago

7 0

The answer is D) 290N i took the test and got it correct

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What is a compound?

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4 years ago

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Determine the empirical and molecular formula for chrysotile asbestos. Chrysotile has the following percent composition: 28.03%

nlexa [21]

Answer: The empirical and molecular formula of chrysotile is $Mg_3Si_2H_3O_4$ and $Mg_6Si_4H_6O_{16}$

Explanation:

We are given:

Percentage of Mg = 28.03 %

Percentage of Si = 21.60 %

Percentage of H = 1.16 %

Percentage of O = 49.21 %

Let the mass of compound be 100 g. So, percentages given are taken as mass.

Mass of Mg = 28.03 g

Mass of Si = 21.60 g

Mass of H = 1.16 g

Mass of O = 49.21 g

To formulate the empirical formula, we need to follow some steps:

Step 1: Converting the given masses into moles.

Moles of Magnesium = $\frac{\text{Given mass of Magnesium}}{\text{Molar mass of Magnesium}}=\frac{28.03g}{24g/mole}=1.17moles$

Moles of Silicon = $\frac{\text{Given mass of Silicon}}{\text{Molar mass of Silicon}}=\frac{21.06g}{28g/mole}=0.752moles$

Moles of Hydrogen = $\frac{\text{Given mass of Hydrogen}}{\text{Molar mass of Hydrogen}}=\frac{1.16g}{1g/mole}=1.16moles$

Moles of Oxygen = $\frac{\text{Given mass of oxygen}}{\text{Molar mass of oxygen}}=\frac{49.21g}{16g/mole}=3.07moles$

Step 2: Calculating the mole ratio of the given elements.

For the mole ratio, we divide each value of the moles by the smallest number of moles calculated which is 0.752 moles.

For Magnesium = $\frac{1.17}{0.752}=1.5$

For Silicon = $\frac{0.752}{0.752}=1$

For Hydrogen = $\frac{1.16}{0.752}=1.5$

For Oxygen = $\frac{3.07}{0.485}=4.08\approx 4$

To convert the mole ratios into whole numbers, we multiply individual mole ratios by 2

Mole ratio of Magnesium = (2 × 1.5) = 3

Mole ratio of Silicon = (2 × 1) = 2

Mole ratio of Hydrogen = (2 × 1.5) = 3

Mole ratio of Oxygen = (2 × 4) = 8

Step 3: Taking the mole ratio as their subscripts.

The ratio of Mg : Si : H : O = 3 : 2 : 3 : 8

The empirical formula for the given compound is $Mg_3Si_2H_3O_8$

For determining the molecular formula, we need to determine the valency which is multiplied by each element to get the molecular formula.

The equation used to calculate the valency is :

$n=\frac{\text{Molecular mass}}{\text{Empirical mass}}$

We are given:

Mass of molecular formula = 520.8 g/mol

Mass of empirical formula = [(24 × 3) + (28 × 2) + (1 × 3) + (16 × 8)] = 259 g/mol

Putting values in above equation, we get:

$n=\frac{520.8g/mol}{259g/mol}=2$

Multiplying this valency by the subscript of every element of empirical formula, we get:

$Mg_{(3\times 2)}Si_{(2\times 2)}H_{(3\times 2)}O_{(8\times 2)}=Mg_6Si_4H_6O_{16}$

Hence, the empirical and molecular formula of chrysotile is $Mg_3Si_2H_3O_4$ and $Mg_6Si_4H_6O_{16}$

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4 years ago

The volume of the salt solution is 1000 mL. If the density of the solution is 1.0g/mL, calculate the mass of the solution. Check

xxMikexx [17]

Answer:

1000kg

Explanation:

Density=mass/ volume

Mass= Density× volume

Mass= 1.0g/ml×1000ml

Mass= 1000kg

6 0

3 years ago

The equilibrium constant, Kc, for the reaction N2O4(g)⇌2NO2(g) is 5.0×10−3. If the equilibrium mixture contains [NO2] = 0.050 M

Sergeu [11.5K]

Answer:

0.50 M is the molar concentration of $N_2O_4$ .

Explanation:

The equilibrium constant of the reaction = $K_c=5.0\times 10^{-3}$

$N_2O_4(g)\rightleftharpoons 2NO_2(g)$

Equilibrium concentration of $NO_2$ = 0.050 M

$[NO_2]=0.050 M$

Equilibrium concentration of $N_2O_4$ = ?

$[N_2O_4]= x$

The equilibrium constant of the reaction is given aSL:

$K_c=\frac{[NO_2]^2}{[N_2O_4]}$

$K_c=\frac{(0.050 M)^2}{x}=5.0\times 10^{-3}$

$x = 0.50 M$

0.50 M is the molar concentration of $N_2O_4$ .

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3 years ago

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