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3 years ago

Determine the identity of X in the following alpha decay equation (please help)

Chemistry

1 answer:

ICE Princess25 [194]3 years ago

8 0

Answer:

At-207 (meaning At with the number on the top left being 207 and the number at the bottom left being 85.

Explanation:

The sum of the mass numbers has to equal on both sides, so we need 211 = 4+a

a=207

The sum of the atomic numbers as to equal on both sides, so 87=2+b

b=85

The element is determined by the mass number.

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4 years ago

Why is it logical to assume that the hydrogen ion concentration in an aqueous solution of a strong monoprotic acid equals the mo

Masja [62]

Strong acids are those that dissociate completely into their ions. So the dissociation equation for a strong acid is:
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3 years ago

A weather balloon is inflated to a volume of 2.2 x 10^3 L with 37.4 g of helium. What is the density of helium in grams per lite

Ede4ka [16]

Density = mass/volume
substituting the given values :
We get :
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8 0

3 years ago

Which of the following explains why salt water is considered a mixture

Svet_ta [14]

Answer:

sal5 water = kaka

Explanation:

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7 0

3 years ago

Calculate the moles of O atoms in 0.658 g of Mg(NO3)2.

lara31 [8.8K]

Answer:

There are 0.0267 moles of oxygen in 0.658 grams of magnesium nitrate.

Explanation:

Mass of magnesium nitrate = m = 0.658 g

Molar mass of magnesium nitrate = M = 148 g/mol

Moles of magnesium nitrate = n

$n=\frac{m}{M}=\frac{0.658 g}{148 g/mol}=0.004446 mol$

1 mole of magnesium nitrate has 6 moles of oxygen atoms. Then 0.004446 moles magnesium nitrate will have :

$6\times 0.004446 mol=0.026676 mol\approx 0.0267$

There are 0.0267 moles of oxygen in 0.658 grams of magnesium nitrate.

8 0

4 years ago