3 years ago

Please help me fast, I will give brainliest if correct!

Chemistry

1 answer:

Angelina_Jolie [31]3 years ago

4 0

Answer:

The first one.

Explanation:

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How many grams are there in 1.5x1025 molecules of hydrogen gas (H2)?

alexandr402 [8]

Answer:

1537.5

Explanation:

3 0

3 years ago

At what temperature (in °C) would one liter of phosphine gas, PH3, have a mass of 1.725 g, if the gas pressure is 0.9910 atm? As

Nutka1998 [239]

Answer: Temperature of one liter of phosphine gas with a mass of 1.725 g and gas pressure of 0.9910 atm is $-36^0C$

Explanation:

According to the ideal gas equation:

PV=nRT

P = Pressure of the gas = 0.9910 atm

V= Volume of the gas= 1.0 L

T= Temperature of the gas in kelvin = ?

R= Gas constant = $0.0821Latm/Kmol$

n= moles of gas= $\frac{\text {given mass}}{\text {molar mass}}=\frac{1.725g}{34g/mol}=0.051ol$

$0.9910atm\times 1.0=0.051\times 0.0821\times T$

$T=236.7K=(236.7-273)^0C=-36.3^0C$

Thus the temperature (in °C) of one liter of phosphine gas with a mass of 1.725 g and gas pressure of 0.9910 atm is $-36.3^0C$

5 0

4 years ago

How many grams of HNO3 it is required to play 8.75gr N2O<br> 4ZN + 10HNO3-4ZN ( NO3 ) 2 + N20 + 5H2O

Y_Kistochka [10]

Molar mass

HNO₃ = 63.02 g/mol

N₂O = 44.013 g/mol

The balanced equation is :

<span>4 Zn + 10 HNO₃ = 4 Zn(NO₃)₂ + N₂O + 5 H₂O
</span>
10 * 63.02 g HNO₃-----------> 44.013 g N₂O
? HNO₃ -----------------> 8.75 g N₂O

Mass HNO₃ = 8.75 * 10 * 63.02 / 44.013

Mass HNO₃ = 125 g

hope this helps!

4 0

4 years ago

Enyzmes change the _______ of a reaction by making the reaction go ______

11111nata11111 [884]

Rate, fast :Maybe these are the answers.

6 0

3 years ago

A solid mass of 25g is added to a solution with the mass of 60g. The final mass of the solution is 75g. Explain why the mass of

Ann [662]

It is not equal because it dose not obey the conservation of mass. 60+25= 85 not 75.

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4 years ago