Question 1

The chemical formula for hydrogen bromide is HBr. A chemist determined by measurements that 0.030 moles of hydrogen bromide participate in a chemical reaction. Calculate the mass of hydrogen bromide that participates. Round your answer to 2 significant digits. 0 g x10 × Ś

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Assuming gasoline to be pure 2-methylhexane, C7 H16 (actually, it is a mixture of many substances), an automobile getting 26.5 miles per gallon would consume 5.96 x 1023 molecules per mile. Calculate the mass of this amount of fuel. Mass =  g

A researcher is using 7.20 x 1023 molecules of chlorine gas (Cl2) in an experiment. How many grams of chlorine is the researcher using? Remember to include units (abbreviated appropriately) and the substance in your answer. Round your answer to the nearest 0.01.

Chemists have determined that 18.0 g of water consists of 6.02 x 10 23 molecules. Determine the number of water molecules a one quart container can hold. ( 1 quart = 946.35 g )

This is the chemical formula for talc (the main ingredient in talcum powder): Mg3(Si2O5)2(OH)2 An analytical chemist has determined by measurements that there are 0.039 moles of silicon in a sample of talc. How many moles of hydrogen are in the sample? Be sure your answer has the correct number of significant digits.

Gaseous methane (CH4) will react with gaseous oxygen (O₂) to produce gaseous carbon dioxide (CO₂) and gaseous water (H₂O). Suppose 8.8 g of methane is mixed with 22.5 g of oxygen. Calculate the maximum mass of water that could be produced by the chemical reaction. Round your answer to 3 significant digits. D X 3 ? B Ⓒ2022 McGraw Hill LLC. All Rights Reserved. Terms of Use | Privacy Center | Accessibility P DII F10 Explanation Check 38² 80 888 F4 FS MacBook Air Fo J ol

Calculate the number of atoms in 1.02 × 10 moles of helium. x 10 atoms (Enter your answer in scientific notation.) Calculate the number of moles of helium that contains 2.27 × 1041 atoms. moles

Urea, chemical formula (NH2)2CO, is used for fertilizer and many other things. Calculate the number of N, C, O, and H atoms in 1.58 × 104 g of urea. Enter your answers in scientific notation.

Liquid octane (CH,(CH,) CH, will react with gaseous oxygen (02) to produce gaseous carbon dioxide (CO,) and gaseous water (H,O). Suppose 3.4 g of octane is mixed with 21.2 g of oxygen. Calculate the maximum mass of carbon dioxide that could be produced by the chemical reaction. Round your answer to 2 significant digits. Ox10 60

DUE NOW. Please answer it with the correct significant figures. Thank you!

Methane gas (CH4) reacts with chlorine gas (Cl2) to produce liquid carbon tetrachloride (CCl4) and hydrogen chloride gas (HCl). The balanced chemical equation for the reaction is as follows: CH4(g) + 4 Cl2(g) → CCl4(l) + 4 HCl(g). Calculate the number and types of atoms present in the reactants in this chemical equation. C       Cl       H

A student needs to produce 22.53 grams of nitrogen gas (N2) for a lab experiment. How many grams of ammonia (NH3) will be required to produce this amount of nitrogen? Round your answer to the nearest 0.01 and remember to include units and substance! NH3 --> N2 + H2

Gaseous ethane (CH3CH3) will react with gaseous oxygen (O₂) to produce gaseous carbon dioxide (CO₂) and gaseous water (H₂O). Suppose 2.1 g of ethane is mixed with 9.80 g of oxygen. Calculate the maximum mass of carbon dioxide that could be produced by the chemical reaction. Round your answer to 2 significant digits. 0 ? E Ⓒ2022 McGraw Hill LLC. All Rights Reserved. Terms of Use | Privacy Center | Accessibility DII F12 F9 FB F11 F10 Expination Check :8: X 80 S 2008 MacBook Air S F6 F7

Part A: How many atoms of hydrogen does it contain?         Express your answer using four significant figures.   Part B: How many molecules of glucose does it contain?         Express your answer using four significant figures.   Part C: How many moles of glucose does it contain?         Express your answer using four significant figures.   Part D: What is the mass of this sample in grams?         Express your answer using four significant figures.

A chemist measures the amount of bromine liquid produced during an experiment. She finds that 658. g of bromine liquid is produced. Calculate the number of moles of bromine liquid produced. Be sure your answer has the correct number of significant digits. mol D X

A sample of mercury(I) nitride weighs 3.33 dg.  How many nitrogen atoms are in this sample?The answer must be 3.26 x 10^20 N . I need the solution how to get the answer

Introduction to Chemistry: Chemical Formulas as Formulas: Converting between Grams of a Compound and Gram of a Constituent Element.   Iron is found in Earth's crust as several iron compounds. Calculate the mass (in kgkg) of each compound that contains 7.1×103 kg of iron. Given: Fe2O3 (hematite) Express your answer in kilograms to two significant figures. The answer :  Mass = 1.1 x 104 kg   But I don't know how it got here. I keep getting 4.9 kg for my answer. Converted it to kilograms also is a challenge for me. I know that 1 g = 1000 kg and that  1 kg = 0.001 g. But i'm not sure how to apply it.

5. The density of water at 4.00°C is 0.967 g/mL. How many molecules of water are present in a 499.8 mL bottle of water? Express your answer to the correct number of significant figures. Be sure to show all steps completed to arrive at the answer. 1.615 X 105 molecules water, to solve the equation you can calculate the mass and the water and then convert It to moles and then you calculate the number of molecules

The reaction between copper and sulfur is represented by the chemical equation shown below. What is the theoretical mass in grams of Cu2S, 159.16 g/mol, formed from 5.43 grams of copper? Report your answer with three significant figures. 2 Cu + S→ Cu2S

The chemical formula for lithium hydride is LiH. A chemist measured the amount of lithium hydride produced during an experiment. She finds that 1.16 g of lithium hydride is produced. Calculate the number of moles of lithium hydride produced. Be sure your answer has the correct number of significant digits. mol

Pheromones are a special type of compound secreted by the females of many insect species to attract the males for mating. One pheromone has the molecular formula C₁9H38O. Normally, the amount of this pheromone secreted by a female insect is about -12 1.4 x 10 g. How many molecules does this quantity contain? Be sure your answer has the correct number of significant digits. molecules

Aqueous hydrobromic acid HBr will react with solid sodium hydroxide NaOH to produce aqueous sodium bromide NaBr and liquid water H2O. Suppose 79.3 g of hydrobromic acid is mixed with 24. g of sodium hydroxide. Calculate the minimum mass of hydrobromic acid that could be left over by the chemical reaction. Be sure your answer has the correct number of significant digits.

Silane, SiH4, is prepared according to the following equations: Si(s)  +  3 HCl(g)  →  HSiCl3(l)  +  H2(g) 4 HSiCl3(l)  →  SiH4(g)  +  3 SiCl4(l) If you use 2.42 moles of solid silicon, how many moles of silane can you obtain? Your answer should have 3 significant figures.