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Aloiza [94]
2 years ago
8

What is the mass of 1 mole of MgSO4?

Chemistry
1 answer:
Lemur [1.5K]2 years ago
3 0
I think it will be say c
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The half-life of sodium-24 is 15 days. A laboratory technician measures out a 72 g sample. Approximately how many grams of sodiu
Vanyuwa [196]

Answer:

after 45 days 9 g left

Explanation:

Given data:

Half life Na-24 = 15 days

Mass of sample = 72 g

Mass remain after 45 days = ?

Solution:

Number of half lives passed:

Number of half lives = time elapsed / half life

Number of half lives = 45 days / 15 days

Number of half lives = 3

At time zero total amount = 72 g

After first half life = 72 g/ 2= 36 g

At 2nd half life = 36 g/2 = 18 g

At 3rd half life = 18 g/2 = 9 g

Thus after 45 days 9 g left.

6 0
3 years ago
Write a balanced equation describing each of the following chemical reactions:
shusha [124]

Explanation:

( a )

The decomposition reaction of KClO₃ to form diatomic oxygen gas is the following way -

2  KClO₃ ( s )  -------> 2 KCl ( s ) +  3O₂ ( g )

( b )

The reaction of solid metal of Aluminum with Iodine in the following way -

2 Al ( s )  +  3 I₂ ( s ) ------> Al₂I₆ ( s )

( c )

The reaction of sodium chloride with aqueous sulfuric acid is as follow -

2 NaCl ( s )   +  H₂SO₄ ( aq ) ------>  2 HCl ( g ) +  Na₂SO₄ ( aq )

( d )

The reaction of phosphoric acid with potassium hydroxide , in the following way -

H₃PO₄ ( aq ) + KOH ( aq ) ------> KH₂PO₄ ( aq ) + H₂O ( l )

8 0
2 years ago
Consider the chemical equilibrium of a soap that is present in its aqueous solution. C17H35COONa(aq) mc017-1.jpg C17H35COO–(aq)
MAVERICK [17]

Answer : Option B) The equilibrium will shift to the left to such an extent that it leads to the precipitation of solid soap.

Explanation : The equilibrium will tend to shift to left because addition of sodium chloride salt will lead to precipitate the soap as a product. The volume increase in the sodium ions because of sodium chloride addition will generate the more amount of solid soap.

5 0
3 years ago
Read 2 more answers
Calculate weight of anhydrous compound from remains upon dehydration of 2g copper sulphate pentahydrate
Greeley [361]

Answer:

1.28 g

Explanation:

Mass of anhydrous compound/molar mass of anhydrous compound = mass of hydrated compound/ molar mass of hydrated compound

Mass of anhydrous compound = ?

Mass of hydrated compound = 2g

Molar mass of anhydrous compound= 160 g/mol

Molar mass of hydrated compound = 250 g/mol

x/160 = 2/250

250x = 2 ×160

x= 2 × 160/250

x= 1.28 g

4 0
2 years ago
A student increases the temperature of a 417cm³ balloon from 278k to 231k. Assuming constant pressure, what should the new volum
viva [34]
Charles law states that volume of gas is directly proportional to temperature at constant pressure 
V/T = k
where V - volume , T - temperature and k - constant
\frac{V1}{T1} =  \frac{V2}{T2}
where parameters for the first instance are on the left side and parameters for the second instance are on the right side of the equation 

in the question it states that the temperature has been increased from 278 K to 231 K but it should actually be temperature is decreased from 278 K to 308 K
substituting the values in the equation 
\frac{417cm^{3} }{278K} =  \frac{V}{308 K}
V = 462 cm³
the answer should be D. 462 cm³ 
3 0
2 years ago
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