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PtichkaEL [24]
2 years ago
7

Helpppppo meeeeee plzzzzzzzzz

Chemistry
1 answer:
antoniya [11.8K]2 years ago
6 0
For 2 it’s 2ft 10in
For 5 it’s 3ft 6in
You: put how tall you are
Adult: you can either measure an adult or use this 5 ft 10in
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A stainless steel knife has a volume of 1.2 cubic centimeters and a mass of 9.0 grams.
bija089 [108]

Answer:

7.5

Explanation:

density = mass / volume

9÷1.2 = 7.5

5 0
2 years ago
A car travels 10km in 10 min so what is the average
ipn [44]
Average speed in km/h:

S = D/T

T = 10/60 hrs
   =  0.1667

S = 10 / 0.1667
   =  59.988 km/h
4 0
3 years ago
How many grams are in 5 mols of KOH​
elena55 [62]

Answer:

0.08911760029829444

Explanation:

hop that this what you wanted

8 0
2 years ago
What is the mass of 19.5 moles of carbon dioxide?
Olenka [21]

Explanation:

mass = moles * molar mass

molar mass of carbon dioxide (CO2) = 12+32 = 44

= 19.5* 44 = 858

proof

moles = mass /molar mass

= 858/44 = 19.5 moles

6 0
3 years ago
How much heat does it take to melt 5.0g solid copper?
Leya [2.2K]

Answer:

Q=1.04kJ

Explanation:

Hello,

In this case, for latent heat (phase change) we need to consider the enthalpy associated with the involved process, here, melting or fusion; thus, the enthalpy of fusion of copper is 13.2 kJ/mol, therefore, the heat is computed as:

Q=m\Delta H_{fus}

Nevertheless, since the given enthalpy is per mole of copper, we need to use its atomic mass to perform the correct calculation as follows:

Q=5.0g*\frac{1mol}{63.54}* 13.2\frac{kJ}{mol}\\ \\Q=1.04kJ

Which is positive as it needs to be supplied to the system.

Best regards.

5 0
3 years ago
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