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2 years ago

HELP I Need TO GET THIS ANSWERD ITS DUE TODAY

Chemistry

1 answer:

Pavlova-9 [17]2 years ago

6 0

Number 2 is correct answers

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I need the answers? Pls help!

Vesnalui [34]

Im pretty sure its h2o so like the 2nd one

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2 years ago

What does the Atomic Number tell you? the amounr of electronstprorons

tankabanditka [31]

Answer

Atomic number or proton number tells us the number of protons found in the nucleus of every atom of that element

Explanation:

6 0

3 years ago

Magnesium metal burns in air to form a mixture of magnesium oxide (MgO, M = 40.31) and magnesium nitride (Mg3N2, M = 100.95). A

dedylja [7]

Answer:

26.95 %

Explanation:

Air contains the highest percentage of oxygen and nitrogen gases. Magnesium then combines with both of the gases:

$2 Mg (s) + O_2 (g)\rightarrow 2 MgO (s)$

$3 Mg (s) + N_2 (g)\rightarrow Mg_3N_2 (s)$

Firstly, find the total number of moles of magnesium metal:

$n_{Mg} = \frac{1.000 g}{24.305 g/mol} = 0.041144 mol$

Let's say that x mol react in the first reaction and y mol react in the second reaction. This means:

$x + y = 0.041144 mol$

According to stoichiometry, we form:

$n_{MgO} = x mol, n_{Mg_3N_2} = \frac{y}{3} mol$

Multiplying moles by the molar mass of each substance will yield mass. This means we form a total of:

$m_{MgO} = 40.31x g, m_{Mg_3N_2} = \frac{y}{3} 100.95 g =$

The total mass is given, so we have our second equation to solve:

$40.31x + 33.65y = 1.584$

We have two unknowns and two equations, we may then solve:

$x + y = 0.041144$

$40.31x + 33.65y = 1.584$

Express y from the first equation:

$y = 0.041144 - x$

Substitute into the second equation:

$40.31x + 33.65(0.04144 - x) = 1.584$

$40.31x + 1.39446 - 33.65x = 1.584$

$6.66x = 0.18954$

$x = 0.028459$

$y = 0.041144 - x = 0.012685$

Moles of nitride formed:

$n_{Mg_3N_2} = \frac{y}{3} = 0.0042282 mol$

Convert this to mass:

$m_{Mg_3N_2} = 0.0042282 mol\cdot 100.95 g/mol = 0.4268 g$

Find the percentage:

$\omega_{Mg_3N_2} = \frac{0.4268 g}{1.584 g}\cdot 100\% = 26.95 \%$

7 0

2 years ago

18. An objective observation is one without

elena55 [62]

D. details about what happening

5 0

2 years ago

Read 2 more answers

Two workers used a force of 100 N to move a sofa 4 meters in 2 seconds how much power

r-ruslan [8.4K]

Answer:

200 watts

Explanation:

First we have to find total work:

W =F(d)

W = 400J

Then plug that answer into the Power formula.

P = W/(t_f-t-i)

P = 400/2s

P = 200 W

3 0

2 years ago