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LuckyWell [14K]
3 years ago
5

X=2 and y=3 find the value of 3x + y 3x² - 4 solve this please ty​

Chemistry
2 answers:
oksano4ka [1.4K]3 years ago
8 0

3x+y

3(2)+3

9

3x2-4

3(2)^2-4

3

11111nata11111 [884]3 years ago
7 0

Answer:

3x+y = 9

3x² - 4 = 8

Explanation:

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andrezito [222]
1na2co3>1 na2o+ 1 co2
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3 years ago
How many neutrons does element X have if its atomic number is 29 and its mass number is 99?
stira [4]
Number of neutrons = mass number - atomic number

= 99-29 = 70 
4 0
4 years ago
g Gaseous methane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water . Suppose 0.96 g of methane
galben [10]

Answer: 2.64 g of carbon dioxide that could be produced by the chemical reaction.

Explanation:

To calculate the moles :

\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}    

\text{Moles of} CH_4=\frac{0.96g}{16g/mol}=0.06moles

\text{Moles of} O_2=\frac{6.37}{32}=0.20moles

CH_4(g)+2O_2(g)\rightarrow CO_2(g)+2H_2O(g)

According to stoichiometry :

1 mole of CH_4 require = 2 moles of O_2

Thus 0.06 moles of CH_4 will require=\frac{2}{1}\times 0.06=0.12moles  of O_2

Thus CH_4 is the limiting reagent as it limits the formation of product and O_2 is the excess reagent.

As 1 moles of CH_4 give = 1 mole of CO_2

Thus 0.06 moles of CH_4 give =\frac{1}{1}\times 0.06=0.06moles  of CO_2

Mass of CO_2=moles\times {\text {Molar mass}}=0.06moles\times 44g/mol=2.64g

Thus 2.64 g of carbon dioxide that could be produced by the chemical reaction.

7 0
4 years ago
Homes may be heated by pumping hot water through radiators. What mass of water will provide the same amount of heat when cooled
dolphi86 [110]

Answer:

mass of water is 7.43 g

Explanation:

q = mc∆T

qsteam = 100 g × 1.864 J/(g °C) × (110 – 100) °C = 1864 J

qwater = mwater× 4.184 J/(g °C) × (95 – 35) °C = mwater× 251.04 J/g = qsteam = 1864 J

mwater = 1864 J / 251.04 J/g = 7.43 g

3 0
3 years ago
Gina made 9{,}350 \text{ mL}9,350 mL9, comma, 350, space, m, L of chicken noodle soup. She packed 1.8 \text{ L}1.8 L1, point, 8,
RoseWind [281]

Answer:

7,550\ mL

Explanation:

Remember that

1\ L=1,000\ mL

To convert L to mL multiply by 1,000

we know that

Gina made 9,350 mL

She packed 1.8 L of the soup in her kids' lunches

She froze the rest of the soup

step 1

Convert L to mL

1.8\ L=1.8(1,000)=1,800\ mL

step 2

To find out how many milliliters of soup did Gina have left to freeze, subtract 1,800 mL from 9,350 mL

9,350-1,800=7,550\ mL

5 0
4 years ago
Read 2 more answers
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